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Question about Prime95 and Hyperthreading

K

Kilroy

n00b
Joined
Mar 7, 2004
Messages
12
Prime95 allows you to run two instances at a time if you have a dual-processor system. Well, a P4 with hyperthreading appears as two processors to the OS so, if I want to torture test my CPU with it, do I need to run two instances of it?

If so, I haven't been having much luck with it so far. The system is stable with one instance, but as soon as I start another either my PC will just restart or one instance of P95 will crash. The temperature doesn't seem to change much whether I'm running one or two instances (~55C after 5 minutes), but with only one instance my CPU utilization is only around 50% usually, and never above 60. With two instances, I get 100% CPU utilization.

I am overclocking (a 2.6C at 3.18GHz now and maybe 3.25 later). I get this same behavior at default settings though, except of course lower temperatures. Do I have a faulty CPU?
 
Your CPU might be fine, but if the Mobo measures its TEmps with an extra diode, not the one inside your CPU core, the core itself might be hitting 60 to 65, and overloading. Also, if you've OCd the system, something might be screwed up there.
 
Originally posted by Little Grabbi
Your CPU might be fine, but if the Mobo measures its TEmps with an extra diode, not the one inside your CPU core, the core itself might be hitting 60 to 65, and overloading. Also, if you've OCd the system, something might be screwed up there.
Click to expand...
It is the Abit IC7-Max3 motherboard. Not sure how it measures the temperature though.

A little more info:

I was getting similar behavior before I overclocked. That is, I would still get instability with two instances of P95 running. It doesn't crash immediately. It runs for a while and then crashes - usually when one of the instances starts a new test.

With only one instance running, the system is stable at 3.18. I haven't been able to extensively test it yet, but it gets through 3 passes of memtest86 and 6 hours of the P95 "blend" torture test.
 
I have had unstable overclocks fail after 12 hours of Prime95. Run it at load for 24-48 hours to see if it is stable. 6 hours won't do.
 
Originally posted by Captain Rehab
I have had unstable overclocks fail after 12 hours of Prime95. Run it at load for 24-48 hours to see if it is stable. 6 hours won't do.
Click to expand...
I will. But first I want to know if I should run one or two instances, and if my inability to run two instances indicates a hardware failure.
 
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