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Phenom II 955 - 3.8GHz to 4.0GHz

post #1 of 14
Thread Starter 
Hello OCN. I just stumbled upon this forum after the BD launch. After reading everything I think I will stick with my Phenom II 955 CPU for the next year or so. I would, however, like to overclock my CPU a bit more than it is currently.

Here's my BIOS settings:

- All CPU options disabled except AMD-V (Need it for Virtualbox)

CPU Freq: 200x19 (3800, I want 4000 atleast)
Vcore: 1.4
CPU-VDDA: 2.8 (Not sure what this is. LLC maybe?)

NB Freq: 2800
CPU-NB: 1.3

HT Link: 2000

DRAM Freq: 1600
Voltage: 1.6
Timing: Auto (I want something like 9-9-9-24 but not sure how to do it)

------

Right now I'm getting 50.1GFlops consistently on IBT without running any other program.

I would like to do the following:

- Get atleast 4.0GHz stable on IBT. I can't seem to get IBT stable at 4.0Ghz even with 1.55V for CPU. If anyone knows how this is possible, please do let me know.
- Get RAM timing to 9-9-9-24. It's 10-11-9-22 in BIOS (auto). What options do I need to set in BIOS?

My system specs are in my signature.
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Dragonborn
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post #2 of 14
Quick question before I jump in here, is your 955 a c2 or c3?

I have the same CPU/Board and the m4a79xtd evo has a terrible vdroop. I could get 4.0 stable but the voltage was a little too close to the max for my taste. I just left it at 3.8 and called it a day.

In day to day performance the difference in 3.8 to 4.0 is miniscule, the only place you will notice that much of a difference is in benchmarks.
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by cajun73 View Post
Quick question before I jump in here, is your 955 a c2 or c3?

I have the same CPU/Board and the m4a79xtd evo has a terrible vdroop. I could get 4.0 stable but the voltage was a little too close to the max for my taste. I just left it at 3.8 and called it a day.

In day to day performance the difference in 3.8 to 4.0 is miniscule, the only place you will notice that much of a difference is in benchmarks.
It's C3 stepping. Yeah my board has horrible Vdroop as well. It's 1.378V idle. Under load it goes to 1.355V.

The reason why I want 4.0GHz is for playing GTA IV. I'm playing with ICEnhancer 1.25. I'm just trying to squeeze out a bit more performance.

What voltage did you use for IBT stable?
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Dragonborn
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post #4 of 14
I'm around 1.4ish for 3.8 stable. I got 4.0 with like 1.52 but it was too close for me and the temps weren't good so just clocked it back down and quit. Then I tinkered with the NB and memory timings before I called it a day.
Edited by cajun73 - 10/17/11 at 10:35am
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post #5 of 14
I've always noticed more stability by overclocking FSB and Multiplier, rather than multiplier alone.

250*16 is usually a good combo that I start with on all my CPUs.

Also keep in mind that every chip is different and there are plenty that simply cannot hit 4GHZ regardless of voltage. Either due to the chip itself, motherboard, or RAM.

What is your Core Temp under IBT?

You need to manually set your RAM to 9-9-9-24 in BIOS and leave it:

tCL: 9
tRCD: 9
tRP: 9
tRAS: 24
Edited by ALUCARDVPR - 10/17/11 at 10:29am
post #6 of 14
Thread Starter 
Quote:
Originally Posted by cajun73 View Post
I'm around 1.4ish for 3.8 stable. I got 4.0 with like 1.52 but it was too close for me and the temps weren't good so just clocked it back down and quit. Then I tinkered with the NB and memory timings before I called it a day.
Got BSOD at 1.52 but got it somewhat stable around 1.5125. Just before the end of last session, my CPU clocked down to 800Mhz briefly (Probably due to PhenomMsrTweaker). Temps are a also bit higher than expected. Here are the results:

Quote:
Time (s)Speed (GFlops)Result
52.81250.03673.573501e-002
52.32850.49943.573501e-002
51.95150.86633.573501e-002
52.28450.54233.573501e-002
58.76444.96913.573501e-002

Edited by dotaduck - 10/17/11 at 11:11am
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Dragonborn
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post #7 of 14
Quote:
Originally Posted by dotaduck View Post
With 3.8Ghz, my core temps are 44'C to 55'C

I will try those settings you posted and let you know. What about other RAM settings such as 1T or 2T?
55C at 3.8GHZ? What is your ambient (room) temp?

2T: Gives you the best performance and stability
1T: Gives you max performance but not very good stability
post #8 of 14
Thread Starter 
Quote:
Originally Posted by ALUCARDVPR View Post
55C at 3.8GHZ? What is your ambient (room) temp?

2T: Gives you the best performance and stability
1T: Gives you max performance but not very good stability
Ambient room temperature is 31'C. I think I'll got with 2T then since RAM doesn't affect performance too much.


Here's what I got using your settings:

Quote:
Time (s)Speed (GFlops)Result
50.64952.17343.573501e-002
50.54952.27703.573501e-002
50.51752.30993.573501e-002
50.49152.33733.573501e-002
50.65552.16703.573501e-002


The result is much better using 250x16. I'm surprised my RAM is able to run at 1667 frequency. I will set the RAM timings now and post back soon.

EDIT: Looks like my RAM was set automatically to 9-9-9-24-2T. I think only thing left to do is reducing temperatures.
Edited by dotaduck - 10/17/11 at 11:22am
Dragonborn
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Dragonborn
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Hard DriveOSOSMonitor
Seagate 1TB 5400RPM Windows 7 Ubuntu 10.04 ASUS VH236H 
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post #9 of 14
Thread Starter 
Final results:



Thanks everyone!
Dragonborn
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Dragonborn
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CPUMotherboardGraphicsRAM
Phenom II 955 Asus M4A79XTD EVO MSI GTX 460 Hawk G.Skill DDR3 1600 2x2GB 
Hard DriveOSOSMonitor
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post #10 of 14
IMO 5 runs IBT not enough, i think 50 minimum.

You should raise your CPU-NB voltage to from 1.3 till 1.4v, go testing, 1.31v, 1.32v.

It helps.
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