Tom's Hardware > Forum > Overclocking > General Discussions > One core can hanlde 3.4 ghz but other can't? core 2 duo

One core can hanlde 3.4 ghz but other can't? core 2 duo

Forum Overclocking : General Discussions - One core can hanlde 3.4 ghz but other can't? core 2 duo

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cranbers   01-26-2007 at 05:32:43 PM

So I have my rig over clocked at 3.4 ghz and I have been running prime 95 with two seperate instances running. One will cut out with an error after a few mins the other will continue on for over 7 hours and I cut it off. I have no problems running windows or 3dmark 2006 or cpu burn in etc.

So is my system stable? I mean what is the definition of a stable system? Where windows doesn't bsod? Where there are errors when running programs?

Any opinnions would be appreciated.

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cappster   01-26-2007 at 10:25:38 PM
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In my experience with running prime95 (the multithread version), I had a similar problem as you. I would start it up and one core would fail and the other kept running into affinity. I believe the cause of that is when one core fails, the working core offloads back onto the core that failed the test. Get what I am saying?

Take a look at task manager and look at the performance and see if that is what its doing after it fails. When I looked at mine, it would show only a 50% workload and it was offloading to the other core. When it worked properly, my cpu was pegged at 100% on both cores.

I would part of a system being stable is if you see any glitches while gaming, BSOD is a big one and any stuttering while multitasking "light" applications.

Hope that helps!

Cappster

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cranbers   01-27-2007 at 02:44:05 AM
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Quote :

In my experience with running prime95 (the multithread version), I had a similar problem as you. I would start it up and one core would fail and the other kept running into affinity. I believe the cause of that is when one core fails, the working core offloads back onto the core that failed the test. Get what I am saying?

Take a look at task manager and look at the performance and see if that is what its doing after it fails. When I looked at mine, it would show only a 50% workload and it was offloading to the other core. When it worked properly, my cpu was pegged at 100% on both cores.

I would part of a system being stable is if you see any glitches while gaming, BSOD is a big one and any stuttering while multitasking "light" applications.

Hope that helps!

Cappster



I have been using my pc at 3.4 ghz for a while now. I have had no problems, well one time i started up 3dmakr 2006 and it froze up upon initializing the test. But when I use my computer I have no problems. running folding at home, and suring the net listening to music running other applications. I mean rock solid. I do notice a weird problem with 3dmark 2001 though and tha tis it freezes up on the enviroment bump mapping test. But I played games like oblivion, quake 2 stuff like that with no problems.

I mean is 3dmark 2001 really necessary anymore does it tell you anything if you can run 3dmark 2006 all the way through with no problems but yet, the 6 year old version can't be ran?? I mean I just don't get it maybe it is a bug in the driver?

Guess I just won't worry about it and just use my computer and ignore the fact prime 95 shows an error on one of the cores anywhere from 2 to 15mins after being ran. I have slowly been clocking downt he fsb to figure this out and well nothing seems to help. I guess the only thing I can do is clock it down to default and run it for 24 hours and see if anything happends. Maybe I have a defective cpu and its not even the over clock?

Another thing I don't understand is that how can a intensive multi threaded application like that run for 15 mins and then find an error?

If I were to run a burn in test for say 24 hours. which I haven't I bet the computer would be fine. So why is prime 95 so important? and if it shows an error after 15 mins on one core but the other side can run forever I guess does it even matter? I mean the system is stable. it's not restarting or crashing. so I guess I answered my own question.

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cappster   01-27-2007 at 03:25:22 PM
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I would say your machine is slightly unstable. If it is hanging on programs then you may need to back down your overclock a little bit or try adding more voltage.

make sure you are using this version

ftp://mersenne.org/gimps/p95v251.zip

When my OC failed with prime, I went back and made some adjustments and got it to run stable for 6hours on both cores (thats when I stopped the test).

Your other core can run a lot longer because once one core fails, the CPU itself is not being pushed as hard. Also, like I stated before, the core still running the test can still offload to the other core because its resources have freed up.

So, it may be stable at 50% load but not at 100% when both cores are maxed out. Try lowering your OC to find out if you can run the test without having either core fail.

Cappster

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