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9550 at 3.8 safe?

post #1 of 26
Thread Starter 
I have a q9550 on Asus Rampage Formula Mobo overclocked at 3.8ghz(original frequency is 2.84).
I have it on 1.4v and it's running stable 24/7 at 44c idle and 65-67c full load. I use it for 3D graphics and such. What i want to know is if these temperatures are ok and how much is the processor going to last at this OC.

Ps. The rig pulls 20k in 3dmark2006.
post #2 of 26
If you're going to be running that 24\\7, you need to drop the voltage. 1.4 is too high for 24\\7 usage.
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post #3 of 26
Thread Starter 
ok...10x 4 the advice
i will try to lower it now, see if i can get it stable
post #4 of 26
Quote:
Originally Posted by calinu View Post
I have a q9550 on Asus Rampage Formula Mobo overclocked at 3.8ghz(original frequency is 2.84).
I have it on 1.4v and it's running stable 24/7 at 44c idle and 65-67c full load. I use it for 3D graphics and such. What i want to know is if these temperatures are ok and how much is the processor going to last at this OC.

Ps. The rig pulls 20k in 3dmark2006.
What do you mean by "full load"? (What program(s) are you running to get those temps?)

Orthos or Prime 95 Small FFT's (with all four threads) is full load - it will show you max temps for your CPU with full L2 cache utilization.
    
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post #5 of 26
Thread Starter 
okay...something is fishy. My CPU core voltage changes acording to load. When in idle it reads 1.36v @ 42c, and full load(rendering) 1.32v @ 63c. Why is this? The computer feels stable with this voltage, but i will need to do some more testing.
post #6 of 26
Thread Starter 
i render in 3ds max and it uses all 4 cores at 100% (taskmanager)
post #7 of 26
Quote:
Originally Posted by calinu View Post
okay...something is fishy. My CPU core voltage changes acording to load. When in idle it reads 1.36v @ 42c, and full load(rendering) 1.32v @ 63c. Why is this? The computer feels stable with this voltage, but i will need to do some more testing.
Quote:
Originally Posted by calinu View Post
i render in 3ds max and it uses all 4 cores at 100% (taskmanager)
"Rendering" is not necessarily full load.

Just because it shows 100% CPU usage in taskmanager, doesn't necessarily mean your CPU is being pushed to "full load" and showing you maximum temps.

And it definitely doesn't guarantee it's stable. If you really want to see max temps and full CPU usage, nothing I know can beat Prime 95 (which uses Lucas-Lehmer testing to find Mersenne Prime numbers) for CPU stress testing. Running that (for at least 8 hours) is a true test of CPU stability. (There are a few other programs that also run these same iterations as well, such as Orthos.)

Read more about it @ Mersenne.org

Download Prime 95 directly from OCN here.

EDIT: Technically, to be honest, nothing I know of can truly guarantee your CPU is 100% stable - Prime 95's tests are just the closest thing to it.

EDIT: And the CPU's core voltage drop during load is normal. It's called "V-droop". It is actually built into a lot of motherboards, originally as somewhat of a "safety feature". Some boards have options in the BIOS to stop it, and on some boards, "hard mods" or "pencil mods" can be done to eliminate it. Otherwise, you just have to compensate for it by raising your CPU V-Core in the BIOS until it runs stable.
Edited by Choggs396 - 7/9/08 at 2:30am
    
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post #8 of 26
Test your load temperatures with prime95. there can be 2 programs that taskmanager say is using 100%, and one can produce higher temps than the other.


The drop in voltage you referred to is called vdroop. All boards have it, some worse than others.
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post #9 of 26
Thread Starter 
I followed your advice Choggs396. Running prime95 v 25.6 my system became unstable. So i lowered the freqvency to 3.7 and my voltage is now 1.31. The cpu is very hot with prime95 running. 69c
post #10 of 26
Quote:
Originally Posted by calinu View Post
I followed your advice Choggs396. Running prime95 v 25.6 my system became unstable. So i lowered the freqvency to 3.7 and my voltage is now 1.31. The cpu is very hot with prime95 running. 69c
Sorry to hear that.

But at least you can use it to determine if your OC is stable now.
    
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