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Ok on SmallFFT and LargeFFT, but failing blend

post #1 of 14
Thread Starter 
This is my first time overclocking attempt, though I have built a few machines in the past

I am trying to take my system to 3.6GHz at 450FSB and the current state is:
  • I have run Memtest (10 passes) fine on my memory
  • SmallFFT runs fine for 8+ hours
  • In-Place LargeFFT runs fine for 8+ hours
  • Blend crashes (BSOD) in 2-4 hours timeframe

I have had no issues working on the machine, but I can't get Blend to pass for 4+ hours. CPU temp have been ~30 idle and 55-60 full load (Large FFT)

Based on some reading here, over the course of last week, I have tried to be stable on my own. I have raised a few voltages, and I am not sure if I have overdone this - most recently a BIOS post failed and when I went into BIOS there was a warning that OC may have unstable voltages. I have decided to get some expert advice from forum at this point

Running on:
Gigabyte EP45-UD3LR w/ Latest F11 BIOS
Running 4 x 2GB 800MHz DDR2 sticks
Intel Q9400

Currently, my BIOS is in following state:
Code:
MB Intelligent Tweaker(M.I.T.)
Robust Graphics Booster ...............: Auto
CPU Clock Ratio ..........................: 8x
Fine CPU Clock Ratio.....................: 0
CPU Frequency ...........................: 3.6GHz (450x8)


Clock Chip Control 
Standard Clock Control
CPU Host Clock Control..................: [Enabled] 
CPU Host Frequency (Mhz) ............: 450Mhz
PCI Express Frequency (Mhz) .........: 100

C.I.A.2 .................................:[Disabled]


Advanced Clock Control [Press Enter] << Default values as below
CPU Clock Drive...........................: 800mV
PCI Express Clock Drive.................: 800mV
CPU Clock Skew (ps)....................: 0ps 
MCH Clock Skew (ps)...................: 0ps


DRAM Performance Control
Performance Enhance...................: [STANDARD]
(G)MCH Frequency Latch...............: [400Mhz]
System Memory Multiplier ..............: [2.00D]
Memory Frequency (Mhz) ..............: 800900
DRAM Timing Selectable ................: [Auto]

Standard Timing Control
CAS Latency Time........................ 5 [6]
tRCD ......................................... 5 [6]
tRP'........................................... 5 [6]
tRAS.......................................... 18 [24]


Advanced Timing Control (All default values)

Motherboard Voltage Control

CPU
Load-Line Calibration..................: [Enabled]

CPU Vcore….……….........................: 1.2875V    [1.3625V]
CPU Termination…............: 1.2V    [1.34V]
CPU PLL…………………...........: 1.55V    [Auto]
CPU Referen.…………...........: 0.805V    [Auto]

MCH/ICH
MCH Core……………................: 1.1V    [1.3V]
MCH Reference….……...........; 0.76V    [Auto]
ICH I/O……………….................: 1.55V    [Auto]
ICH Core…………...……............: 1.1V    [Auto]

DRAM
DRAM Voltage ……................: 1.8V    [2.0V]
Any pointers on next steps? TIA
Edited by apesterin - 12/18/10 at 11:15am
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post #2 of 14
Too much ram OC? Very tight timings? More chipset/nb voltage?
I'm not used to p45 chipsets, but Blend tests stress the motherboard/ram/cpu while Large/small fft are very cpu intensive
    
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by jak3z View Post
Too much ram OC? Very tight timings? More chipset/nb voltage?
Thanks, I was suspecting the RAM side of things as well, as both small/large FFT pass. That is why I upped the RAM volt to 2.0 and relaxed the timings to 6-6-6-24 (rated is 5-5-5-15). I know it's not in the same league but memtest seems to be going fine for 10 passes

I am not sure about the voltages. Do you think I should up NB or RAM volt further, or relax timings further? I was a bit scared to see overvol warning on entering BIOS (though only once, and isn't affecting anything visually, but still)

Or does anyone think trying to run 800MHz RAM at 900MHz itself may not be doable in this case? Is there a certain test to verify this?

Sorry for trivial sounding questions, but this is my first attempt at OC. Looking forward to sensible next step I should try. Also hoping that someone would have the similar hardware and OC experience here
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post #4 of 14
Thread Starter 
Also, since I am running 4 sticks of RAM, should I up the MCH v further? I am not sure if my RAM would safely take more than what I have now (2v). Or should I start with relaxing the timing further (if yes, any suggestions? I haven't worked with timings much)
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post #5 of 14
Maybe I'm missing this, but what is your RAM?
Normally, sticks that are rated at 1,8 should be able to go up to 2,2 if nessecary.
Though a lower value is always better for your parts

Have you tried lowering the CPU MP and ajusting RAM divider and FSB in a way that you mem runs at 900Mhz.
And then blend testing to make sure if your ram can take it. If yes: give it a little more FSB so you can find the max of your RAM.
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post #6 of 14
From what I know, Memtest is normally for testing whether or not there are any issues with the RAM itself, not for testing overclocked RAM.
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post #7 of 14
Yeah memtest is not really good to test the OC of the rams.
What OC do you have on the rams? 800Mhz > 900Mhz?
    
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by SandersAce View Post
Maybe I'm missing this, but what is your RAM?
Normally, sticks that are rated at 1,8 should be able to go up to 2,2 if nessecary.
Sorry, I should have mentioned. I have these (all PC2-6400):
2x2GB A-Data Gaming Series 5-5-5-12 @1.9-2.1v (part AX2U800GB2G5-CG) - slots 1/3
2x2GB OCZ Gold Series 5-5-5-15 @1.8v (part OCZ2G8002G) - slots 2/4

Quote:
Originally Posted by SandersAce View Post
Have you tried lowering the CPU MP and ajusting RAM divider and FSB in a way that you mem runs at 900Mhz.
And then blend testing to make sure if your ram can take it. If yes: give it a little more FSB so you can find the max of your RAM.
I am not sure what you mean by CPU MP. I have the host clock set at 450MHz, and the RAM at 1:1 is getting at 450MHz. Or do you mean to go back on my CPU/FSB overclock and stress the RAM in isolation? That sounds like a good suggestion if you can confirm

I was more worried about the CPU Termination / MCH and RAM voltages. Do you think any of these is getting over the board right now? Also, do you recommend I keep the timings as relaxed as 6-6-6-18 for further testing?

Quote:
Originally Posted by Baldy View Post
From what I know, Memtest is normally for testing whether or not there are any issues with the RAM itself, not for testing overclocked RAM.
Quote:
Originally Posted by jak3z View Post
Yeah memtest is not really good to test the OC of the rams.
What OC do you have on the rams? 800Mhz > 900Mhz?
Understood that Memtest isn't the right tool here. I just added it to say what I have done. I actually don't know of a tool which can check RAM only in this case.
Regarding OC, yes taking 800MHz > 900MHz
Edited by apesterin - 12/20/10 at 6:07am
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post #9 of 14
You got 2 different brand of mems, uhm... Run 1.95v on the rams and see if that helps. I know you use 2.0 but the 1.8 ones maybe doesnt like 2.0
    
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post #10 of 14
Try just two sticks of ram instead of 4.
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