Advanced AM2+ AMD Chipset Configuration Options and What They Mean.

[Rammsteiner]

Gotvoltage, so you basicly say that the PCI-e slot your GPU is in should have a higher Watt allowance then default? Ive a 4870X2 and I can set specific Watts for each slot, but I was kind of afraid I would fry it (like I thought it would throw a full 200W right on the PCI-e slot).

[roofsniper]

so what exactly does vdd do? it allows for higher overclocks and less vdrop but where is this voltage being applied?

[roofsniper]

Gotvoltage, so you basicly say that the PCI-e slot your GPU is in should have a higher Watt allowance then default? Ive a 4870X2 and I can set specific Watts for each slot, but I was kind of afraid I would fry it (like I thought it would throw a full 200W right on the PCI-e slot).

pcie 1.1 says it can allow 75W. pcie 2.0 says it can allow 150W. because im not having an issue with overclocking or needing more power i just leave it at 75W to take the burden off the board.

[demonkevy666]

so what exactly does vdd do? it allows for higher overclocks and less vdrop but where is this voltage being applied?

a PLL part, SB maybe.

[gOtVoltage]

Gotvoltage, so you basicly say that the PCI-e slot your GPU is in should have a higher Watt allowance then default? Ive a 4870X2 and I can set specific Watts for each slot, but I was kind of afraid I would fry it (like I thought it would throw a full 200W right on the PCI-e slot).

Setting it to above 150watts wont hurt the mobo. Ive tested with 9800+/3870x2/4850/4870/260 all using 200+watts one each 16x slot. It allowed all the Cards to oc better on this mobo. Even my Old TA770 used the same feature with the Same result.

What happens is that it allows to Vidcard/cards to draw mor efrom the slot if needed. It does not use 200+watts all the time. In sense it mearely stabilizes the slot/slots under heavy load and will use a lower limit when not under heavy load. It just allows the card to use what it needs if it has too.

so what exactly does vdd do? it allows for higher overclocks and less vdrop but where is this voltage being applied?

mostlikely its applied to NB/SB chipsets . It mearly stabilizes the Mobo not the CPU from what i understand and have seen. Ive tested this @ 2.8vdd and 1.74+v cpu for over 5months straight now. If it was a apparent problem i woulda cooked this long ago using 2.8vdd. My Mobo uses stock heatpipe cooler , That s all it uses.

a PLL part, SB maybe.

From what ive gathered yes for SB/ NB and devices such as Sata ports benifit as well as IDE. I have yet to see aproblem using 2.8VDD. In fact you should be able to use less Vcore when doing so if you have your sytem dialed in on a Heavy Oc vs using 2.5vdd.

I can only speak from using 2.8vdd.. if something is gonna be buggy or not work ,, i wont tell a person to try it.

2.8vdd has been helpfull on this Mobo. Once i can get my hands on a 940+ cpu i will keep testing it. Mostlikely End of Feb i should be able to start tweaking a new Torture CPU.

[DarthElvis]

bumped from the depths. this is important stuff.

[demonkevy666]

anyone try the clock skew on the bottom with phenom ??? on asus M3A79-t deluxe ?

[Mechromancer]

I actually found this Phenom Overclocking Guide at Guru3D that answered ALL my questions: http://forums.guru3d.com/showthread.php?t=267708

It is pretty dang comprehensive.

[Brother Esau]

Gotvoltage, so you basicly say that the PCI-e slot your GPU is in should have a higher Watt allowance then default? Ive a 4870X2 and I can set specific Watts for each slot, but I was kind of afraid I would fry it (like I thought it would throw a full 200W right on the PCI-e slot).

Just leave that on AUTO RAMM

[Daveburt714]

<RESURRECTION> (way beyond a bump, I had to dig a little for this one! )

I have my machine pretty well dialed in and started wondering about some of the obscure bios settings to tweak things a little further....

Then I remembered this thread, Hopefully other folks may find it useful...

[pawl]

im bus researching some of the ddr3 specific options. they may affect how we derive our memory timings. but its been a long time since i looked at timing diagrams and databooks - so im a bit slow.

[panzerchaos47]

Wow thanks! I thought this got deleted during the time this forum was down. I gave up finding this.

[gOtVoltage]

As for whats Not,, in any Bios

(Ram Drive strenght) for DTC0 and DTC1.

Being able to tweak those should yield 1250+ of ddr2 goodness. OcZ Blades would be insane on this Mobo.

My Vipers have only seen 1220mhz with out being able to tweak drive strengths. Thats this Mobos real lacking OPTION ATM.

Hint ASUS,,
my TA770 even has it in the BIOS and its SB600. Hmmm and OLD ACC Firmware too so i can tweak me 720 with out a Mod Bios.

Wishfull thinking for the 903 or even 904 or whatever Bios

[Uncle Jimbo]

> C1E Support:http://lwn.net/Articles/286432/
This is a power feature that is called the same thing on both Intel and AMD platforms that apparently adds a little more power savings. How you ask? I still do not fully know, but it compliments Cool 'n Quiet it seems.

Power state C1 is the low power state you go into in 'sleep' mode. It has been available since the 486. It reduces or stops various CPU clocks to reduce power.

Intel's version of C1E ('Enhanced C1') is different than AMD's and both change with different CPU implementations. Intel's version reduces voltage to further save power. AMD's version puts all cores into sleep state if all cores are at Halt, and does not require an OS command if C1E is enabled in Bios.

This is probably not something you want to mess with unless you have a multicore laptop, and probably not even then.

[Bgriffs]

Glad to see this came back. I found a lot of good stuff here months ago while trying to figure out to get anything out of my gimp 9600BE. Needless to say it's helped me get a good amount of power out of my new shiny 940BE

[roofsniper]

so you are saying that C1E is only used in sleep mode? i never saw temp drops or anything when turning it on when my cpu was idling but people claimed it uses less power.

[Uncle Jimbo]

so you are saying that C1E is only used in sleep mode? i never saw temp drops or anything when turning it on when my cpu was idling but people claimed it uses less power.

Correct - You won't see any difference in power - it only matters when all cores are halted. You'd have to measure 'sleep power' at the wall since nothing will be running at that point.

This is different than "Cool'n'quiet", which lowers both frequency and voltage in discrete steps, and that does have a big effect on 'average' power, and heat. I always turn it on unless I'm doing specific heat testing.

[mav2000]

Wow this is a great thread for am2+ info. I am going to keep an eye on this. Thanks to all you guys.

BTW I have a Biostar mobo and there are a few questions I have too. Maybe they would be similar to the bios options found in Asus. Will post once I am home. Thanks.

[gOtVoltage]

Wow this is a great thread for am2+ info. I am going to keep an eye on this. Thanks to all you guys.

BTW I have a Biostar mobo and there are a few questions I have too. Maybe they would be similar to the bios options found in Asus. Will post once I am home. Thanks.

I just Installed mY 9950 back into the Original BiostarTA770 A2+.

I was checking temps on the factoy Heatsink after all the HIGHVOLTAGE i GAVE it over a Year and Noticed a New Setting in the Newest Bios for the TA770A2+ and SE..

This is SB600...Bios A78XAC25ZZZ mod Bios @ rebelshaven( 1-2009) Now Has a option for -15% -30% +15% +30% . CPU Freqency Adjust (Performs Like ACC ?)

I have not checked the stock A78XAC25 Official for this same option , im shure its there because if its not Polygon cant unlock the feature in the MOD Bioses. It already has to be present.










This New Bios is made to support everthing past B3 such as 720/810/910/920/940/945 updated cpu code. I find it interesting , could it be a gimped type of ACC. ?

SO ,, I set the CPU @ 1.25vid for CPU and NB then Set the Vcore to 1.37v.. This way I could run @ 3.0ghz(140watt) It was unstable and would get erros in Os..

I did the nest best thing and added 15% cpu freqency adjust. I though it would maybe OC the CHIP. Instead it worked just like ACC and Stabilized the System. So i decided to set 30% Freqency and its still going with no erros or BSOD's @3.0ghz and 1.37vcore..

CPU wise this 9950 always needed 1.42volts to run @ 3.0ghz with stock volts on my M3A79-T. Its now using 1.37v and 30% freqency adjust. on SB600. I cant find any info on this NEW setting for SB600 .

I Think it may be a add in by Polygon ,,when he tweaked the Offical C26Bios . Im gonna PM to see if he knows more. I cant find any info on it.

I thought SB600 couldnt do this kinda stuff

P.S i dont want to push with STOCK cooler too much...This CPU is GOLDEN I just stumbled on this Option and well it Actually works for SB600

Does anyone else have Info on this new Option for Freqency adjust and SB600/700 chipsets.?

Ive never seen anything like it. It does not Raise the VCORE or VID visually or Raise any CPU Clocks,, it just simply worked like ACC and stabilized the CPU. I thought the M3A79T bios was full of surprizes

[mav2000]

Nice...since you are here do you have any idea on cpu configerations in the OC menu. Its like configuration 1 - 6 or 7 I think and no one has any idea what it does and which one to use.

Also my 720BE is unlocked using ACC. I can post at 3.9 Ghz on 3 cores, with ACC off, as if I put it on or auto, then all four cores will show. Would ACC make the disabled 4th core more stable? I have run benchmarking like 3dmark 06 and vantage at 3.6 Ghz 4 cores, but its not prime stable. Its core no. 3 which s out each time. Any idea how to do this?

[gOtVoltage]

Nice...since you are here do you have any idea on cpu configerations in the OC menu. Its like configuration 1 - 6 or 7 I think and no one has any idea what it does and which one to use.

Also my 720BE is unlocked using ACC. I can post at 3.9 Ghz on 3 cores, with ACC off, as if I put it on or auto, then all four cores will show. Would ACC make the disabled 4th core more stable? I have run benchmarking like 3dmark 06 and vantage at 3.6 Ghz 4 cores, but its not prime stable. Its core no. 3 which s out each time. Any idea how to do this?

Ill look into configuration 1-7 ,, I dont have my GX anymore..As for ACC and the Fouth Core ,, Up the volts a hair and or ACC.

Check your temps .

Also youll notice a little more volts for X4cores vs 3cores sometimes. Depends on how hot your running too.

NORTHBRIDGE on cpu may need a little bump and retry stability. The Fourth cores sometimes like less NB and slightly more volts to keep stable when enabled. Ive also seen some of them go way past 3.8ghz stable.

past@ 3.6 on four cores it can take a lot more tweaking for stability . My 720 is good @ 4x 3.78mhz Max @2400nb. 3.6ghz x4cores even with 2000nb is not bad. 4.0ghz is my max so far on 3xcores.

Note:
+2 or +4 Allcores and see if that helps. Mine Likes +4 for 3.8@2000nb. ACC @Allcores should still unlock on that Mobo with out crashing , seeing it unlocks in Auto.


UPDATE ***790GXB CPU ***CONFIGURATION***



T-Series Settings
WARNING: Setting wrong values in below sections
may cause system to malfunction.
=========== Automate OverClock System ===========
============ Manual OverClock System ============
OverClock Navigator [Manual OverClock]
Auto OverClock System [V6-Tech Engine]
CPU/HT Reference Clock(MHz) [200]


***CPU Configuration [Auto]*** You want to leave this at AUTo (default) its a power performance state just like the PO/P1 feature like other MotherBoards. TA770 has the PO/P1 CPU configuration.. Sometimes this can be labeled as ADVANCED CPU set up in other Bioses.
Simply allows one to use Lower Pstates. It can crash a sytem by simply changing it from Auto . usually after a reboot.

ATIG Reference Clock(MHz) [100]
SB Reference Clock(MHz) [100]
Spread Spectrum [Disabled]
> CPU FID/VID Control
> Voltage Configuration
> DRAM Timing Configuration
> Hyper Transport Configuration
> Memory Configuration

I wish i had me old GX id give it the run down.

[Mechromancer]

I'm going to get around to cleaning up and finishing this post. I still have a dump load of testing to do on my end to explain performance results of some of these features.

In the meantime, lets put our brains together and figure out just what the heck BANK SWIZZLE MODE is in the memory settings. I'm looking at it in my AMD OverDrive memory settings tab. In fact, I want to define ALL of those different "drive strength", "Processor On-Die Term" and "DQS RecEnDelay" settings.

We test and tweak not knowing what more than half of these Memory/IMC and Hyper Transport features and settings are for. I feel we may be leaving performance on the table by not knowing. Point me in the right direction if you have answers and I will add them to the first page (Or PM me the phone # to an AMD chipset engineer LOL).

[gOtVoltage]

SPeaking about Bank Swizzle Mode.

Im NOT 100% shure ,but i believe it allows all Ram/dimms to have all Banks comunicate together on the ram. Thus it should slightly speed things up when on.


Ive also found that the CHANNEL MODE when you press F4 Opens up a whole new can worms too.

Disabling it allows some ram to clock more stable. When only two dimms are installed ( same Channel A1 A2 or B1 B2) you should keep this disabled or it will try to access channels that are not populated with ram.

When all slots are filled set to auto or one of the other channel settings listed in Menu to enhance ram searching or access.

M3A79-T.

Im Only using 2gigs of 2x1gig Viper ATM...So i keep this Disabled.
Remeber if your only using two Dimms/sticks No matter the Sive set this option to disabled.

If Using All slots BOth A1 A2 and B1 B2 for four sticks you can play with the settings . I would just leave this on Auto when using Four sticks if you do not have any Problems.



BANK INTERLEAVING,,This is the Same as Bank Swizzle mode i believe. I set to auto for beter access.

[mav2000]

Thanks gotvoltage, will try with +4 on all cores to see what it does. I have upped the NB and HTT voltages but that did not really help. I am able to run them at stock even with the NB up at 2.6 Ghz or so. This is mainly due to FSB tweaking. Will try it after I get home.

[Mechromancer]

I appreciate tha gOtVoltage! I can test with both two and four sticks of ram, but each pair is a different manufacturer (as in my sig). I'll let yall know if I find any interesting behavior.