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thanx man! but that's not what i wanted to hear :( here's the thing i just discovered, though... at 258x9 and 1.93vdd (1.9v BIOS) i pass SuperPi32M. but once i lower it to 1.82vdd (1.8v BIOS) it errors out right in the middle. i repeated it twice and got same pattern... so maybe it will get me higher if i mod it :) i'll do it tommorow maybe....Quote:
Originally Posted by STEvil
I think they need better cooling and a hipro mod of sorts for better/more stable voltage delivery.
The backside of my infities nb was baking.. even after lapping the crap out of it and putting a large copper cpu block on it.
ok, maybe i should not be posting that here... but anyway, i'm kind of excited so i will :D
since i'm staying up late tonight i did vdd mod on my Infinity.... 1.90v BIOS gives me 2.09v with a multimeter. and guess what ???
...it booted up just fine @ 261x9 (before it would freeze during POST) and ripped through SuperPi16M like it was butter :banana: so it looks like giving the chipset more juice helps - at least my mainboard :) i'll keep pushing it, especially at higher multis...
so on,
It does not really help with high fsb at high multis...
So don't be too anxious ;)
/edit. I can use 2.2V with the mod plugged in, but it makes no difference at all.
hey SAE, do u have APIC and ACPI disabled? Im at 255x10 prime stable right now with both enabled, and I cant get 250x10.5 stable, so I was wondering whether u think I should try to disable them? think it would help? :rolleyes:
so what is yje secret then :) ? what do u think gives you such high FSB at even very high multis? can u tell me ? :)Quote:
Originally Posted by SAE
I never switch it off as I did not really notice gains disabling it...Quote:
Originally Posted by FlyingHamster
I can bench superpi 1m at 12x272 now :D I'd loose to much of 3d performance in 2001 (system dependant, 03 and maybe 05 don't loose this much). So I would not recommend it. The 10.5x multiplier seems to be an unstable choice... bachus got the same problems.
Secret?! Hmm. In case there is something like that... my hardware did not reveal it to me ;) IMHO my ram is great, the board's decent too, the mods help a lot, my cpu's great, my cooling too :DQuote:
Originally Posted by bachus_anonym
SAE... i can't remember if u ever posted list of vmods u did... i assume u got vdimm, vdd, vcore, vdroop... what about SB vdd ? did you do that one, too?
i 'm thinking that 25ish is the board's limit... coz i have 3 kits of 512MB BH-5 here to work with... all of them are doing 260x9 @ 3.65v but non of them will give me 260x10 stable enough in SuperPi32M... so i assume it MUST be the board... anything else i should try ?
thanx
yeah SAE tell us :D
I did:
VDimm
Vdd
Vcore
Vdroop
OCP
And the cap mod the newer boards already have (between the first two ram mosfets)
SB Vdd gains you nothing, at least it did not stabilize things for me with apic enabled. From LORD I know he even had to drop the alpha timings a bit to get a stable system.
So I'd suggest you all: don't do it, it's not worth the hassle...
And the better every mosfet and driver ic is cooled, the faster they can switch - increased stability is what we get ;) Don't forget to place some fans there to cool everything down more quickly.
That's it. :D
thanks for the info on the south vdd...can you explain the vdrop and OCp to me? like what i need to do and what they do for you?Quote:
Originally Posted by SAE
thanks!!!!
http://www.xtremesystems.org/forums/...chmentid=17256Quote:
Originally Posted by stealth17
That's a lil guide I did for all those who keep asking me every day ;)
OCP allows more current to get through to the CPU -> more current -> more power (but also thermal power should increase, and it's dangerous indeed)
Vdroop is a mod to avoid or minimize a droop in the vcore supply when the mosfets are switching (IMHO), it's stabilizing the vcore a bit.
we should just steals sae's LB.....
ja wohl :P
Thanks soo much! i really need that! i have been googling for a droop mod and havent came up with anything yet....the guys over at EOCF didnt even know it was possible!Quote:
Originally Posted by SAE
whats the point of the OCP when doesnt a VR do the same or does it like max out at some point?
and can i use a 10k fixed for the droop? like what would a 5k do over a 10k?
thanks!
I used a 1k. I would say use a 2k or 5k.
as to OCP, its best to use fixed since it is very hard to fine tune 3xVR's and if they got bumped....
well, so i just did vcore mod... works just fine but unfortunately doesn't help me to use over 2.02v (multimeter). it seems that for some reason i can bench at up to 2.07v but running prime95 causes reboots after about 30sec... when i go back to 2.02v prime has no problems at all...
is there any sort ov OVP mod that will let me overcome this problem?
OCP mod
but isn't OCP mod different from OVP? i was thinking about it but i would really need to know for sure if that helps as this is far more invasive mod...
I havent seen an OVP mod for the lpb/infinity as far as I know... or one that works for that matter.
OCP is the issue usually.
i just keep coming with those posts, don't i ? but maybe some would find it usefull one day :)
so, i did "OCP-overcome" mod.... i didn't have any fixed resistors on hand so i used 5k ohm trimmers set at 3k ohm...
i had no reboot after Prime95 was started :banana: as a matter of fact i set 247x10.5=2600MHz which is Prime-stable @ 1.95v but this time i bumped vcore to 2.11v idle. while "Priming" it jumped to 2.14v and pretty much stays there :)
so far i have vdimm, vdd, vcore, vsense (disconnected atm) and ocp mods :)
i'm not sure if i really need vdroop and vsense, though...
greets,
should be good ;)
for those that need a confirmation that vsense mod might not be neccesary (as SAE mentioned) - check out the attachments...
stable 2.20v LOAD with no vsense mod and where this voltage takes my xp-m 2500+ :banana: "Priming" as we speak...
oddly enough i could bench at this speed with only 2.07v before but never Prime95 stable...
Hi,
last week I bought the ultra infinity board. The change to a NF7 is very big. With the same system I reached 240fsb on the NF7 and now 265fsb. My question is now how can I reach more?
My rig:
Ultra Infinity Hellfire Rev3 bios, Vdd-Vcore-Vmem modded, Vdd@2,2V @-31°C
Vmem@3,7 with bh-5sticks 2x256 mushkin black levelII@ 11-2-2-2
R9800pro@XT 520/410 @-31°C
I found that for me the best alpha settings are AUTO. Everithing other is not so stable. I can run Memtest with 270fsb test#5 without problems @2,5,3,3,11 with windows is crashing. It doesnt matter which timings have the ram windows isnt stable even with lowest timings. So is the NB limiting me or the ram?? Or is it the CPU XP-m mobile2500+ on air? :mad:
thx
Yes, you can use a fixed resistor as well. I am also doing so :) I use a 4.75k metal film resistor.Quote:
Originally Posted by stealth17
The lower the resistance, the smaller the droop is.
BUT!!! : You are also decreasing the total vcore voltage doing that. So you'll have to compensate this decrease increasing the vcore through your vcore mod. :D
OCPmod like fixed resistors as STEvil said :) It's safer. (I prefer SMD resistors)
@diamonddog
Hmm. There are many possible causes for this behaviour of your system.
1. APIC
2. instabilities at certain voltage regulation units
3. some kinda over current protection
4. NB quality as well
5. SB
6. noise in the pcb
7. electrostatic/magnetic fields
... and so on
I also cannot figure out everything what's wrong here with my system ;)
I'd like to have 270fsb as well, but I don't wanna try anymore as from 260MHz on with max timings the NB/SB start to freak out... Socket A cannot run stable above that. Sound quits while gaming and so on. Occasional instabilities appear...
So no chance to get a stable 265 with evry device working correctly and sound or lan not dropping.
@bachus
Great job there, pal :thumbsup:
I think the parts causing the instabilities are the nb, sb, and that little square chip just under the ram slots that gets so darn hot..
If my board was still working today i'd pelt both chips and put a huge chunk of copper on that square chip just to see what happens :D