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Prime95 Help

527 Views 14 Replies 5 Participants Last post by  GoHigh, 
GoHigh
I don't usually use Prime95 every since I discovered OCCT, but I am using it now to stress test my Q9650.

Currently, I am at 4.14Ghz at 1.3vCore, 460x9.

1.34VTT
1.4v NB
1.54v PLL
2.3v DRAM @ 1104mhz

The only thing I can use right now, which have been going stable for about 4 hours right now, is the Small FFT. Everytime I use OCCT 3.04 or Prime95 Blend, it fails within 2 min.

Can someone decode why this might be so?

My guess right now is that CPU OC is fine, but Memory OC is not well. Is my presumption correct or am I missing something?

The most PITA part is my P5Q Deluxe does not like 1:1 ratio, as it fails to boot.

Help me please...
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M
What I do is run memtest86+ to test the memory before I go into Windows to test using Prime95 and OCCT.

In your case, what's your memory speed? It is a OCZ reaper, but at what speed? do you have the memory model number?
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GoHigh
It's OCZ Reaper (The SS Pipes) 1066mhz model. I even tried downclocking to speeds I know to be stable with my old Q6600 (1088 @ 2.24v), with same result. Tried pumping more voltage into CPU thinking maybe it's lacking something but no, still same problem.

What might the problem?
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M
I find it strange that you have 2.3V on the memory. Spec for your memory seems to be 2.1 - 2.2 V. And being 1066 you are quite close to its stock speed. Have you tried lowering it to 2.2 ?

Have you tried going higher on NB voltage?
How are your temps?
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GoHigh
I know... Right now, I am desperate for some answers so I tried the 2.3v, to see if that would help it.

I did try however with stock voltage, and it still did the same thing.

My temps are nowhere near even close to being the factor...

It loads at 51c with my TRUE.

I think the problem is my MEMORY divider...

It seems as though my mobo/ram combo does not like 1:1 ratio or 12:10 ratio, but only seems to enjoy the 5:6 ratio, which puts my RAM at 1100+. I am trying different timings right now to see if I can get it stable, but I might have to get a different set of rams or something.

Any input on this matter would be greatly appreciated.
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ChickenInferno
Quote:


Originally Posted by GoHigh
View Post

Currently, I am at 4.14Ghz at 1.3vCore, 460x9.

The most PITA part is my P5Q Deluxe does not like 1:1 ratio, as it fails to boot.

Wait your rig won't boot with lower than stock ram speeds? Like 920mhz is lower than your stock so no matter what it should be fine as long as it's not autolowering the timings too much when you reduce the speed. <--This above all does not make sense

If the rig will boot with the cpu at FSB460 and the ram at FSB552, but not at FSB 460....that's just weird. All I can honestly think of is bumping your northbridge to 1.5v; it's got to be pretty stressed at FSB460.

(I'm voting that it's not a cpu issue so it's mobo or ram)
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GoHigh
Quote:


Originally Posted by ChickenInferno
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Wait your rig won't boot with lower than stock ram speeds? Like 920mhz is lower than your stock so no matter what it should be fine as long as it's not autolowering the timings too much when you reduce the speed. <--This above all does not make sense

If the rig will boot with the cpu at FSB460 and the ram at FSB552, but not at FSB 460....that's just weird. All I can honestly think of is bumping your northbridge to 1.5v; it's got to be pretty stressed at FSB460.

(I'm voting that it's not a cpu issue so it's mobo or ram)

It can't be either the Mobo or Ram issue... It does that no matter which OCZ ram I've used before. But, it does boot at 1:1 ratio with my GEIL EvoOne (which rules out Mobo), but I would like the extra bit of performance I might gain from OC of memory. And you are right, it is not CPU issue since this was the case whether I used my E8500, Q6600, and my new Q9650.

This is getting to be really frustrating...
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ChickenInferno
The fact that the mobo will run a 1:1 ratio on a different set of ram sends flashing lights off in my head. Run the GEIL at a 1:1 ratio on prime95 blend. If it passes, then I actually think it's a ram issue since your OCZ reaper is unable to run at a 1:1 ratio and pass.
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GoHigh
Quote:

Originally Posted by ChickenInferno View Post
The fact that the mobo will run a 1:1 ratio on a different set of ram sends flashing lights off in my head. Run the GEIL at a 1:1 ratio on prime95 blend. If it passes, then I actually think it's a ram issue since your OCZ reaper is unable to run at a 1:1 ratio and pass.
Tried but failed to boot with GEIL as well. 450FSB now, which put GEIL at 900mhz, and would not boot.

What would cause SMALL FFT pass and fail BLEND?
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DeadSkull
Its probably your 1100Mhz memory oc that causes p95 to fail in 2 minutes.

AS to why you cant boot in at 1:1 I'm not sure, but it could be a motherboard issue.
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A
I have a kit of 1066 Corsair ram and it also failed with 1066 and my OC.
I had to reduce it to 1045 and now its working fine.
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ChickenInferno
The small FTT completely rules out the CPU. So all other options are ram, mobo, psu, or hdd.

Since it can't run with two different sets of ram, I want to at least temporarily say it's not the ram. You could completely rule it out by running memtest.

The mobo is most likely since it won't run either sets of ram correctly. I would also think that the PSU would cause failure (voltage varying too much) during small FTT especially. The harddrive is a possibility, but I kind of doubt it.

Final Conclusion: Most likely mobo can't handle the high FSB. You can check it by lowering the multiplier to 6 and seeing if it will run prime blend at 6x460. If it can, then it's something else.
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GoHigh
Thanks everyone. It was my Motherboard. I have another spare of the P5Q-Deluxe BNIB, and I swapped it out tonight, and everything seems to be working fine. Wood Knock Knock. I am currently 2 hours into OCCT 3.0.1, with load temps hovering around 49c, with 1.3v and 4.05Ghz (450x9). I think I will stop now, and try to reach my max with this voltage. I even added the second set of OCZ Reapers (8GB), and things are purring along beautifully.
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DeadSkull
I would RMA that board b/c its obviously defective.
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GoHigh
Quote:


Originally Posted by DeadSkull
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I would RMA that board b/c its obviously defective.

Yea... I was thinking about it. But to be honest, it was OCing my Q6600 just fine at 3.87Ghz at 1.45v. I don't know why it was having such a difficult time with this CPU. I was going to build a workstation for myself with a E8500, Oced to probably around 4.2Ghz, since I already have all the components for it. If it fails me again with that build, I will probably RMA it, and see what's what.

But then again...

I guess I will always wonder if there IS something with my mobo...

I dunno...

Will see.

Thanks!
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