May help you guys, I posted it on the OCZ support forums.
http://www.bleedinedge.com/forum/showthread.php?t=22297
I will add how it effects overclocking etc next. For now it explains ram ratio's, strap and chipset overclocking.
T
Printable View
May help you guys, I posted it on the OCZ support forums.
http://www.bleedinedge.com/forum/showthread.php?t=22297
I will add how it effects overclocking etc next. For now it explains ram ratio's, strap and chipset overclocking.
T
Nice work Tony,just what we need :toast:
Great reading material over morning coffee. Thanks Tony!
Nice stuff !!!
Now i know what the 'straps' mean ... =D
Well I see lots of theories with many people still moving from A64 to Conroe and being unsure, I thought it best to explain just how it works ;)
What a lot don't get is the internal latency change from 1066 to 1333strap is huge, and has a massive effect on memory performance. The sooner motherboard manufacturers give us control of the chipset in the same way we can control the ram and CPU the better, having it locked to the CPU as it is causes all sorts of overclocking issues...LOL
Hmmm ic ... But i tot i read somewhere that the 1066 strap did perform better than the 1333 strap in some cases, don't know how true that will be.Quote:
Originally Posted by Tony
So the strap depends on the default speed of the chip ? Then how do they change the strap used by the board ?
Nice article but it doesn´t say anything about clock generator straps.
Basically the pll can be the one which craps out first, not the chipset.
Thats why certain boards (like "rev. E") have jumpers or transistors which change the pll start frequency (PLL strap).
I believe that Asus is using this kind of feature in P5W DH.
The board clearly changes strap when it is being booted with certain (267, 334, 401FSB) frequency.
Since the performance doesn´t vary between the straps and the fsb overclockability increases it is more likely that the change is done by pll strap and not nb strap.
Thanks, Tony.:toast:
Very nice, thanks. :)
I try to keep things ultra simple here, i do actually say the clockgen is reset once you up a strap ratio.Quote:
Originally Posted by The Stilt
BSEL pins tell the chipset/clockgen what base strap/fsb to use...you then push up from there.
The info is there, just not slapping you in the face, i have to keep it easy for those less in the know than us ;)
I will follow it up with overclcoking the memory soon and possibly explain more in depth then also.
For those who think the upclock ratio is not working on badaxe im pretty certain it is, its just the chipset has an ultra slack latency set and performance is crap. What we need to do is sift thru the whitepapers(the ones Intel keeps hidden) and see what latency tweaks are available to quicken things up a little ;)
Well Tony, your help is appreciated, especially to those of us who are new to the Intel platform and DDR2 clocks. :toast:
Just like doing the L12 mod on socket A then, but by bios?
thx tony ;) ;)
Great reading material during class Tony, thanks :)
Thanks Tony I'll give it a read tonight. Should help a lot of people :)
Looking forward to the memory half of your article...that's where i'm currently having big trouble with my Allendale setup.
Thats a very helpful article, especialy for some one like me, as conroe will be my first intel based rig. Look forward to reading the rest of it.
regards mike.
I now feel almost certain that the "independent memory overclocking" thing on the RD600 is just what Conroe needs.
Nice explaining Tony. Even I could understand it :)
Altough it will probably still be better to keep FSB and RAM in a certain ratio.Quote:
Originally Posted by jrw
Nice article,
but where do you get all that information from?
Years overclocking memory, it is all i do and how i got this job with OCZ. I study what makes memory clock on a given platform and find the best way to get everything working as sweet as it can be.Quote:
Originally Posted by SMa
I cut my teath on Northwood CPU's on 845 and SIS chipsets, in all i had 21 CPU's and over 60 pairs of BH5 looking for the ultimate combo of CPU and memory, in the end i just used mobile northwoods modified to run the 800 strap by breaking off BSEL1 pin on the CPU.
100%+ overclocks etc on air and BH5 at 260fsb on 845 chipsets etc was what i started with and I kept true to learning each chipset as Intel released it.
so wait, i get all of that no problem. but can you help me out on one bit, its the PLL strap that kicks in at certain fsb, so with the 401fsb start, what exactly does that mean. in that case if you boot at 401fsb it will lock that at 1066 strap with normal timings so no loss in performance. would that mean the northbridge is running a different divider and the normal (stock) speed despite the cpu being at a much higher divider? if thats the case then there should be a lot of head room for fsb from 401fsb up if the northbridge is essentially at stock at this point? or if not, what does the pll strap do differently?
cheers
Do all Intel chipsets work the same?
Like my 955X on the Asus P5WD2 Pr?
All Intel chipsets work the same, starting from 845 up. The clockgens are based on the chipset straps so work the same way pretty much
When you force a strap change will BSEL signals, you reset the clcokgen and the chipset to a default clock. The clockgen may now have a 1066fsb start point and the NB is on a 1066 strap and have all the memory ratios allowed by this strap and a base clock frequency.Quote:
Originally Posted by drunkenmaster
its all about control....but you need I/O chips and bios code to do it, which most boards at this time do not have
@ Tony:
There are a couple of things I've been wondering about, and I would appreciate your input :)
Is this the same as what Abit did with their IS7-series (which has 865 chipset and unofficial PAT-support) ?Quote:
Originally Posted by Tony
Does this mean that 533 strap in a sense enables PAT on any mobo of that generation, despite what the Intel tech doc says?
Quote:
Originally Posted by Intel 82875 MCH tech doc
And I don't understand how the command rate is accessible in certain BIOSes, when the controller is reported to not support 1T at all.
I know there is no official support for 1T, but in the BIOS of my Abit IC7-G, there is a CPC-option, and enabling it affects stability the way 1T command rate actually would. (Haven't been able to compare performance, because it fails to boot at 1T with two sticks populated). This makes me wonder what Abit did, Would it be possible to implement a BIOS-feature that really affects the setup time of the memory controller?Quote:
Originally Posted by Tony
533 strap forces PAT on 865, asus found it and everyone followed.
CPC 1T on 875 etc it 1T but rarely works. DDR2 has no option at this time for 1T on an Intel chipset.
If you study the registers for PAT you will see its the same at 533(865) as 800 on the 875, so all Intel did was overclock the chipset to force faster memory access.
Alright, thanks!
Thanx for the info. Quality post.
Great thread, glad we have posters like Tony willing to share their knowledge, and in a way for us simple minded folk :).
Thanks Tony. so whats the best setting on an Asus P5W DH Deluxe for high FSB ?
Look forward to the followup. Thanks for sharing your considerable experience Tony.
Yeah, good question, answer anyone?Quote:
Originally Posted by graham_h
We're still dying to know :D
The best setting would be force 1333strap on the CPU and clockgen but force 1066 on the chipset to keep the memory fast and run it 1:1.
The issue is we still have no way of telling what the board is doing with the straps.
Coming from A64, that's a great help, as straps confuse me...problem is, I'm still a little confused. Got any links that help explain the use of straps, and the connection between the cpu and chipset?
(I kinda get it...the cpu strap is the same for the chipset, so @1066, the NB is running at 267 with the CPU...but as you rais the FSB of the CPU, your NB rises as well, and you hit a wall when it gets much too hot, unstable, whatever. So if you put a 1333 strap, how does this help? @333mhz, why is it suddenly more stable than taking a 1066 strap and pusing it to 333 and above?)
Also, the RD600 is rumoured to go much above the 370ish wall...would they have the independent straps?
Fake edit: What exactly is the purpose of this strap though? If the chipset and the cpu run totally independant, is there a point where the difference in FSB becomes an issue, or is the entire problem arising because it's easier for manufactureers to set a single strap for both? Do the FSB ratios of both even matter?
(If I asked too many questions, please tell me to shut up, or google (though I tried) ;))
Edit: Still don't get it fully :p after trying to read some things. Default is say 1066, but you play with the FSB, and system bus speed changes. (fsb x 4, correct?), so you set it to 1066, up the FSB, the actual system bus changes...you set it to 1333, up the FSB, the system bus changes...what difference does it make?
Think of it this way:
The chipset has 4 working ranges for speed, these are dictated by the multiplier set for the clock frequency of the chipset.
The Clock generator for the CPU etc has the same 4 working ranges, these are dictated by the BSEL pins on the CPU..IE the strap it sets.
The ram speed ratios are dictated by the chipset dependant on what chipset multiplier has been set for its internal frequency.
Now: the chipset has a max clock just like a cpu does, as you ramp up the clock frequency you may have to lower the mutiplier...you do this by going to a higher chipset strap..IE going from 800 to 1066 etc.
The Clockgenerator has the same issues, its internal PLL has a max working frequency, when you change the BSEL strap on the CPU you actually reset the PLL but initiate the clock at a higher base setting...so, if you moved from 800 to 1066 the FSB working range may be the same 100fsb you have available going from 200fsb to 300 but the base clock the clockgenerator starts at has moved from 200 to 267 so instead of maxing at 300fsb you now max at 367fsb.
finally the lower the strap set the more aggressive the internal latency on the chipset, this means the ram is faster but may not do the tight timings or may not clock as high.Ram ratios are dictated by dividers preset within the chipset per the strap it is set to....1:1 at 800 strap will not be 1:1 on the 1066 strap etc.
Hope this helps
It does for me, but i think alot of people need a diagram as to what happens when you select what. Do you think it's possible for you to come up with something that we can use as a reference?
Excellent Guide :toast:
you want a picture also...ohh man...LOLQuote:
Originally Posted by cadaveca
I wrote it as simply as i could, a pic will take time
no worries..i understand what's going on with the chipsets(it's like the AXP L12 mod, i'm sure), and you are busy. I just see ya typing the same thing over and over.
Great Thread mate. Interesting read!
Yes thank you tony, thank you for taking the time to clarify this!
:clap:
Albatron had a board that featured a digital clock generator, we still have not seen the board in retail but i heard this clockgen alowed the CPU's there were testing with reach in some cased 400MHZ higher clock. They also found CPU's clocked better with less voltage and were stable right to the max of the working frequency.
I have a feeling if this board ever shows we may see some awesome clocks in 1066 strap.
Sounds cool but words are just words :) And pictures says more then thousand words so hehe ;)
I hope we will see it soon.
Very nice work. Thank you.
Asus seems to release a BIOS fairly often. It looks like they could provide a few options like the Bad Axe as far as straps are concerned. I can only select 1333|667 via an "oc profile". Doing this I lose a lot of control of other key things.
In addition, the 7950 GX2 has been officially support in the Bad Axe for a while. I know the 7950 GX2 works fine in the P5W DH Deluxe with the same chipset through experience. They ought to make that official. I thought nVidia and Asus were close and official support would have happened a long time ago. This makes for poor appearances.
Perfect, thanks :)Quote:
Originally Posted by Tony
Nice little guide, esp for an AMD user.
Something tells me that RD600 will have these options (or something like that) build-in - the only explanation for independant memory and CPU frequencies I could guess ofQuote:
What we also need though is the ability to set the NB strap to any option we want also, independently to what the CPU strap is, this would allow us the option to over clock the NB its self. Finally the option to adjust the NB latency, like we had in “875 tweaker”
Yes without a doubt. MANY THANKS!Quote:
Originally Posted by girth_maul
Updated the guide with special ram ratio info and how it effects overclocking.
http://www.bleedinedge.com/forum/showthread.php?t=22297
I know its a double post but with the added info it explains a ton of 5h1t you guys are going thru.
Please read it, if you are struggling with anything post here and I will try and explain it further.
Threads merged and moved to more suitable section - bachus_anonym
Does these tips apply to 965 as well?
you done any research into the 965 setup Tony.
considering the 965 is showing more oddness to its overclocking.
such as FSB walls that stop dead in their tracks at 400mhz FSB.
things such as DRam freq's that refuse to go over 950mhz (which points more to ram, but at the same time, why would the 6400 XTC go over 1000 and the gskill 6400 HZ's stop at 950mhz ?)
the HZ's without a doubt can OC much higher than the XTC's)
any indication of why a lower multiplier on the cpu instantly yields a much higher FSB.
that to me right now is the most frustrating and yet the most technically intrigueing aspect of any of the intel chipsets.
why is it that a lower multi no matter which cpu you are using gives a higher FSB.
from what i can tell, without knowing white papers front to back, is that its an all out Ghz limitation of the NB chipset. otherwise why would dropping the multi increase the FSB ?
these are important questions i have asked since the conroes were released and will continue to ask until someone here or else where can logically answer them.
unfortunately i doubt intel will be telling us why. so we have to rely on each others research.
Taking this from your guide - "We all know Conroe sets 1066strap; this means it forces the board to boot at 267fsb. Now many boards are hitting a limit at 370fsb and stopping dead, we all know the CPU and ram can clock higher so what is causing the boards to become unstable…the answer is the chipset."
I have a Thermalright HR-05 on my northbridge but I did not strap on the 70mm fan I bought for it. I have hit the wall you are speaking of at 375FSB. I know my RAM is awesome and my CPU should be able to hit 3.2-3.4Ghz and I am guessing its the mobo/bios. (MSI 975X V2)
However, my question is why hasn't anyone in the MSI thread been talking about the northbridge and a replacement for it? I assumed it was not a problem or could it just be people don't understand how important cooling for the northbridge is as well.
Thanks for the guide i have printed it and plan on reading it over and over again untill i begin to understand it. Man i like it better when it was fsb x multiplier = clock speed :) If you have time and could explaing in laymans (amd) terms what our best options are i would apprieciate it. I.E. would it be better for me to strap my memory at say 533 then overclock my cpu bus speed to 425 x 10 or do the reverse strap at 1066 and set cpu bus at 300 x 14 or am i totaly off base and need to go buy a intel overclocking for dummys book and pray :)
Thanks
Lee
Can someone possibly explain this in terms an AMD guy can understand?
http://www.bleedinedge.com/forum/showthread.php?t=22297
Is this relevant?
Is this saying you cannot use a memory overclock divider (i.e. 4:5) AND a high FSB speed at the same time?
Sheesh. :confused:
Threads merged - bachus_anonym
you need to PM Tony, I do believe he is a member/mod here. Also note that all that information makes sense if you are using an Asus MB which has a drop down menu that shows you all the options as he posted on the thread.
965 works just the same way as 975 which works just the same as 955 etc etc etc.
965 is a more overclockable chipset than 975, so where the 975 stops with the CPU fsb at 370 ish the 965 is stopping at 400 or so unless you manipulate the strap on the chipset to lower its overall clock.
I can not stress the following enough to you guys.
Many of you are blaming ram for poor overclocking etc when infact its the chipset that is holding you all back. On intel systems you are overclocking 3 things similtaniously, the CPU, the chipset and the memory, all 3 things have to be in balance to get stability.
Some of these huge 500+fsb overclocks are purely managed on the back of very high chipset voltages which are needed to force the chipset to manage huge overclocks. Some people do get lucky and get a NB that clocks like a god...they do exist just as golden CPU's do and GPU's.
Also the wierd memory ratio's (1067 888 712 etc) are the product of chipset strap manipulation, you all have to be aware that this alters how the chipset will overclock and how it controls the memory. It usually will not clock as well although even at lower clocks the memory performance may be better. Also as I mentioned in the guide im already seeing boards setting the 800 strap for 533(1:1) mode with end users complaining they can not do 400fsb 1:1 for DDR800 on their ram so the ram must be faulty. Issue is the ram does ddr800 fine in 667 or 800 mode as the chipset is back at normal clocks and can control the memory a lot easier.
Nice work there Tony mate
Big question - when will we see some of tony's modded BIOS for the Asus P5W DH mobo? :)
Already done some, using them internally..IE they will not be released as of yetQuote:
Originally Posted by maverik-sg1
yup even a bad mount of northbridge/mch heatsink on the MCH core would result in poorer memory clocks and lower fsb !Quote:
Originally Posted by Tony
bad mount saw my mem clock drop from 490mhz 4-4-4-12 at 2.2v to 476mhz 4-4-4-12 and 433mhz 4-4-3-8 at 2.2v
good mount saw my mem clock go back to 490mhz 4-4-4-12 at 2.2v but best of all i jumped from 433mhz 4-4-3-8 to 488mhz 4-4-3-8 at 2.2v
http://www.xtremesystems.org/forums/...d.php?t=110938 !
great guide Tony! I am still a bit fuzzy coming from a 939 rig to Conroe, but im sure once i get into the bios and start overclocking everything will click as to what you were referring to. Not having it in front of me makes it difficult for me to follow, i have to do it myself to really understand.
Ok so how do we force a different strap on the chipset? Is that something has to be done to hack the bios or any other ways?
Somone help me out here
On an Asus P5W they have the following options when choosing Dram Frequency @ 267:
Auto
400
533
667
711
800
889
1067
(using the manual)
Now if I am reading this right are:
Auto, 400, 533, 667 -->all on the 800 strap??
711, 800, 889, 1067 -->all on the 1067 strap???
Help me understand this...If the above is right, where is the 1333 strap....or does it lack a 1333 strap?
Quote:
Originally Posted by Tony
We'd be happy to help you test one:)
Is there anyone who can answer my question in post 64
Almost:Quote:
Originally Posted by Eastcoasthandle
533, 667, 800, should all be on the 1067 strap (stock strap for Conroe)
400, 711, 889, and 1067 would be on the 800 strap which would overclock the memory controller (MCH).
all, except of 711 and 889 are 1066 strap dividers.Quote:
Originally Posted by Eastcoasthandle
711 is 3:4 and prolly belongs to 800 strap
889 is 3:5 and also from 800 strap.. so beware using those :-P
but i guess they will provide the most tight nb timings..
asus boards (at least p5wdh) seem to lack nb strap 1333.
Excellent guide Tony. Although I'm not entirely sure I understand everything, this guide has most certainly helped clarify a few things for me. The study session continues.....
Hey Tony, a massive thanks for that guide you posted at bleedinedge, I understood every bit of it.
I am about to purchase an Asus P5B Delux, now I have never oveclocked an Intel board before, but I doubt I will find that an issue finding my way around theBIOS etc. Anyway I am just wondering is there anyway to force a certain strap on these boards?
Perhaps a BSEL pin/pad mod?
well i just tried to cover BSEL2 pin to force 333MHz boot and therefore nbstrap 1333 on asus p5wdh - it's no use :)
max strap is still 266.. as for lower straps i don't know - but in asus bioses, from 266fsb, all 1066 strap dividers plus all others are available, forcing nb strap to lower value, if selected.
http://alpha.frontier86.ee/~markku/975/bsel2.jpg
So the saga continues...how to make a board ubber fast at stock speeds so reviews look awesome
Now you all seem to have a reasonable idea of how straps work i will show you how the motherboard manufacturers manipulate them in bios to make the boards work faster than the competition in reviews.
Using a conroe, which has 1066 strap and 267fsb we all know that 1:1 is 533 on the memory. Now if you want your board to work around 5% faster all you do is lower the strap but keep the ram ratio at 1:1.So you force the strap on the clockgenerator to 1066 but you trick the NB to run on the 800 strap in 400 mode.
On a 965 board this would allow 400fsb+ in theory on the CPU but there is no way the NB would run on the high 800strap internal multi and high bus speed without luck in you gettting awsome silicon and a ton of voltage.
At 267fsb on the CPU though the NB stands a good chance of working just fine, its moderately overclocked but not to stressed....and you gain 5% or so performance from the memory which transaltes into more FPS in game benches.
This is why when I ask you to test ram you need to do it with the 667 or 800 memory ratio, i already know 712,888 and 1067 are 800 strap, what i don't know is what 533 is latched too, as it could easy be off the 800 strap to improve performance at low clocks 1:1.
Call me an oversimplifying loon... but it sounds to me like chipset straps are the Intel version of the HTT multiplier.
Technically different, by a mile, but from the point of view of an overclocker, they are both something on the board that has to be loosened to avoid a third barrier, unrelated to both CPU and memory. In light of limiting overclocks, is this view correct?
God I hope you are onto something here... Otherwise I still don't have a clue what this is about and I've been beating my head against the wall on this coming from AMD. :brick:Quote:
Originally Posted by Chocolate Pi
Is the strap like a clock ratio for the North Bridge (either like a divider or multiplier)?!
To find the correct strap values let's put what tony said in formula:Quote:
Originally Posted by Eastcoasthandle
Ram_Freq=2*FSB_freq*north_multi/mem_div
where:
Ram_Freq is DDR freq (DDR clock*2, this explains the "2" term in the right)
FSB_freq is the base FSB freq (so for 1066 FSB_freq=1066/4=266)
north_multi give us the Northbridge frequency. We have:
533_strap -> north_multi = 3
800 strap -> north_multi = 2
1066 strap -> north_multi = 3/2
1333 strap -> north_multi = 6/5
Note for 533_strap tony speaked of 6 multi, but it referred to FSB_freq/2, so i'm saying the same thing.
mem_div can be set to the following values:
2
3/2
6/5
1
So for a 266 FSB we can have the following "mem ratios":
533_strap-> 800, 1066, 1333, 1600
800_strap-> 533, 711, 889, 1066
1066_strap-> 400, 533, 667, 800
1333_strap-> 320, 427, 533, 640
Because P5W uses only 800_strap and 1066_strap for 1066 FSB we have the following:
Auto -> it depends on RAM spd
400 -> 1066_strap
533 (1:1) -> can be either 800_strap or 1066_strap (but i think p5W uses 1066 strap)
667 -> 1066_strap
711 -> 800_strap
800 -> 1066_strap
889 -> 800_strap
1067 -> 800_strap
Now based on the strap table above, as tony said, we can have 1:1 with 1333 strap too, in this case the FSB at which the north would be overclocked is:
FSB=400/(6/5)=333, so if the north has its wall at 375 FSB with 1066 strap in this case the wall would be shifted at 469...
Thanks for the info.Quote:
Originally Posted by astaris
caate and RyderOCZ, thanks for the infoQuote:
Originally Posted by RyderOCZ
I hope that when available your modded bios will let set the strap and the memory ratio with two different bios entries and that the available mem_ratios will be linked dinamically to the strap you set.Quote:
Originally Posted by Tony
Anyway great findings tony.
very nice info:clap: , thanks tony and astaris
but i still have some stupid terminology to ask?:confused:
1. what's the term "strap" mean? FSB of NB?
2. why 533_strap how does it come out to north_multi = 3
the formula "Ram_Freq=2*FSB_freq*north_multi/mem_div" doesnt show the relation between strap and north_multi?
If i ask the wrong question then just tell me shut up or to the google, thanks
The term strap refers to a setting in a northbridge register (north_multi) that in the available bioses depends on three factors:Quote:
Originally Posted by shine121
1) Nominal FSB of the processor (i.e. 533, 800 and so on)
2) Ram ratio selected (i.e. DDR2 533, 667 and so on)
3) The bios programmers team, when a given ram ratio is available through different north_multis
About the second question we have:
Northbridge_frequency=FSB_freq*north_multi
For a chipset strap equal to 533 the nominal FSB_freq is 133, so in order to have the northbridge frequency equal to its nominal value (400), the north_multi has to be 3.
Good stuff tony, you the manQuote:
Originally Posted by Tony
I was still a bit confused, but thanks alot of astaris, you put it in terms which I understood even more easily then tony's GREAT article.
I think I got it.
Much thanks.
Example...this is just and example
At stock speed E67 Corsair PC6400Pro
800 strap @ Dram Freq 899, MCH @ 1.60 Mem Voltage 2.00V
Using Everest
Mem Read 7766
Mem Write 4821
Mem Copy 5443
Mem Latency 53.6
SPI 18.781
1067 Strap @ 800, MCH 1.60V Mem Voltage 2.00V
Using Everest
Mem Read 7518
Mem Write 4820
Mem Copy 5371
Mem Latency 56.8
SPI 18.812
I didn't OC because I wanted some sort of visual to get an idea of how each strap will do. I assume that once you OC the tighter NB timings on the 800 (711, 889, 1067) strap will reduce your OC considerably (if I am understanding this right) vs. using the 1067 strap (533, 667, 800).
Personally I thought the the 1067 strap would have yieled better performance but I guess it's correct to say that the 800 strap does in fact some sort of OC/tighter timing for the NB.
thanks for the info, now i think i got it.:toast:Quote:
Originally Posted by astaris
looks like Gigabyte DS3 mobo is one of those mobos that's with a lower strap setting for 1:1 mode to enhance its performance at stockQuote:
Originally Posted by Tony
>>>>Tony great work on this write up
I can see that you've put a lot of thought into this and it certainly helps me marginally begin to understand this beast of Intel chipset :thumbs:
I think it now makes a bit more sense why you told me that RAM which i couldn't even boot with the system would run perfectly normally with 800 mode (i think heheh)Quote:
Originally Posted by Tony
just some info for others i've been testing some Fatbody D9 RAM on Gigabyte DS3 (965 chipset) and the RAM was completely struggling 1:1 and was unstable just by going a simple 10MHz over the stock FSB. Not only that buy after clearing cmos and starting with these Fattys the board will just refuse to start.........I would only be able to gain control once i put g.skill HZ stick.....apply 2.0vdimm, save, shutdown, changeover sticks and boot up.
Gigabyte DS3 has the following RAM ratios in bios
2.0 > 533
2.5 > 667
3.0 > 800
2.66 > 710
3.33 > 888
4+ > 1067
However after Tony's suggestions to try 800MHz (3.0 RAM divider in bios) i've discovered that that RAM can operate at 1.8v without any problems whatsoever. In fact this is how it scaled:
1.8vdimm 4-3-2(3inwindows)-9-Auto ~ 355MHz :)
1.9vdimm 4-3-3-9-Auto ~ 380MHz
2.0vdimm 4-3-3-9-Auto ~ 405MHz
2.1vdimm 4-3-3-9-Auto ~ 428MHz
2.2vdimm 4-3-3-9-Auto ~ 452MHz
vdimm past 2.2 was acting funny
http://img151.imageshack.us/img151/5...superpikb9.jpg
so if i'm not wrong the bios design is contributing to a lot of problems people are having with certain room and bootup problems
why puzzles me now is that my other sticks which are G.Skill HZ D9GMH we all know and love work perfectly 1:1 with the same setup.
Tony can you unravel this little mistery for us please
Great read. Thank you very much
tkx to all users for sharing...
really hope that asus releases a bios where more memory timings, and 1333 strap are available.
the thing really anoying me, is my p5wdh can do 400 fsb 1:1 only with spd enabled. :confused:
heheh, after years of reading my first post :toast:
:welcome::DQuote:
Originally Posted by remorema
2.93Core, 800 Strap @ 976 Dram Frequency, MCH 1.65V Mem Voltage 2.20VQuote:
Originally Posted by Eastcoasthandle
Using Everest
Mem Read 8458
Mem Write 5252
Mem Copy 5938
Mem Latency 49.1
SPI 17.250
Memory Clock 488.7 which I believe is 1/2 speed @ 3:5
Quote:
Originally Posted by Tony
Tony et al, First off THANKS!!!
My Question is will these same straps/ratios work the same on the 680i chipsets (C55XE / MCP55XE and C55 / MCP55)?
# FSB 1333/1066/800
# DDR2-1200*/800/667/533 (* for SLI-ready memory with EPP)
Or do we need a "The definitive guide to nvidia chipset/memory over clocking."...??? (My guess is yes the same applies)
Thanks.
Tony, do you know where I can find this guide now? I cant find it anymore at Bleedingedge.... thanks....
Ditto....I was just looking for it myself.Quote:
Originally Posted by luihed
let me join the looking for it too club.Quote:
Originally Posted by FlyBoyGeo
There ya go boys. :)
http://www.bleedinedgesupport.com/oc...ad.php?t=22297
so I just finished reading this inbetween uni lectures this mourning and perhaps somebody could clarify a few things for me.
1. By default a conroe would use 1066 strap?
2. Using different mem dividers can change the NB strap without changing the CPU strap? (this is really what I would like to know...)
3. After overclocking your CPU FSB to a certain point the motherboard automatically selects a different strap (1333?) which increases FSB but relaxes ram timings?
Thanks for any help.
so can anyone else not get to the link? I signed up and everything.. it says I don't have sufficient privies.. like I am trying to edit the post or something.. anyways..
I posted the correct link two posts up. they changed the url.
used to be bleedingedge.com, now it's bleedingedgesupport.com
ty for the link :toast:Quote:
Originally Posted by crazyea
I think the site is down because the link doesn't work.Quote:
Originally Posted by crazyea
The site URL has changed again.Quote:
Originally Posted by mXpS
Correct Link: http://www.ocztechnologyforum.com/fo...ad.php?t=22297