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Questions tagged [prime95]

15 questions
10
votes
1 answer

In Prime95, why do small FFTs generate the most heat, despite CPU at 100% for all options?

I've just built a new Skylake PC, and I'm going to see about a bit of overclocking with Prime95 as a stress tester. It works fine in normal use, but with Prime95 I'm noticing a bit of CPU throttling under certain loads. If all 4 cores (8 threads)…
ChrisA
  • 1,548
5
votes
3 answers

What to do when machine fails a Prime95 stress test?

In an effort to diagnose the cause of random resets and freezes I have been running a series of stress tests on my two year old computer. Thus far the machine has passed nine hours of the Prime95 Small FFT test, thirty minutes of the standard…
ahsteele
  • 1,964
4
votes
4 answers

BSODs and Prime95 failures

My computer is notoriously unstable. It blue screens all the time. I'm running Windows 7. Here's what's in the box: Intel Core i7 920 (Stock cooler, not overclocked) Gigabyte EX58-UD3R motherboard 6GB (3x2GB) OCZ Gold memory (set to 1333MHz, it has…
Mike Pateras
  • 870
3
votes
1 answer

Memtest #5 failing, prime95 failing and BSODs

I've been having a lot of trouble with freezing and bsods with my computer lately, so I took the chance to do a full upgrade. My new system only shares the VGA with the old one, nothing more. Current specs are: MOBO Gigabyte 970a-d3 AM3+ 2x4GB…
Matteo Mosca
  • 197
2
votes
0 answers

What is Prime95 benchmarking?

I've recently had to benchmark the CPU performance of a variety of operating systems on identical machines. I've been using the 'benchmark' functionality of Prime95 to obtain a consistent test. I've gotten some unexpected results such as Windows…
deau
  • 164
2
votes
2 answers

Is Prime95 a dual-core tool?

Does Prime95 use multiple cores? (Is there a difference in this regard between running it from Windows, UBCD, or UBCD4Win?) If it doesn't, are there tools out there that will (preferably via a boot disc)?
ssvarc
  • 750
2
votes
0 answers

View laptop power consumption without running it on battery

My laptop has a bad battery (lasts 20 - 30 minutes of normal use) but I need to see the max power consumption.I tried running Prime95 + Furmark on battery with power saving off (which took 50 watts just before it shut down) and it said battery low…
Suici Doga
  • 2,217
1
vote
0 answers

How can I put the maximum stress on the CPU without using vectorized instructions?

I am testing the characteristics of the CPU frequency fluctuation between the turbo max and the base frequency. Therefore, I want a load that can force the CPU to reduce its frequency from turbo to base when the whole machine load reaches 100%. I am…
Frontier_Setter
  • 123
1
vote
1 answer

How can I give temperature monitoring absolute priority over stress testing?

I am trying to stress test my home-built NAS for cooling problems. Since neither stress, nor FIRESTARTER nor mprime95 look after the temperatures, I want to write a small script that kills all of them (ie the one of them I am currently running) if…
Kurtibert
  • 187
0
votes
1 answer

What's special about Prime95's torture testing?

Overclockers often use Prime95's Torture Test to stress-test their CPUs, but what I don't understand is that why overclockers don't prefer other programs that stress CPU to 100%, for example, anyone can write a tight loop like int i=0; while (true)…
Ming-Tang
  • 139
0
votes
1 answer

Computer shuts off after heatsink upgrade

I just recently replaced the stock heatsink that came with the AMD FX-8150 with a Cooler Master Hyper 212 Evo and have been having a lot of issues with my computer ever since. I first noticed the problem when I was playing Skyrim, the computer just…
ecnepsnai
  • 826
0
votes
0 answers

How to perform CPU stress testing with Prime95 in the command-line mode？

I want to use Prime95 to perform a CPU stress test on the server, which does not have a graphical interface. I encountered two problems while using it. Problem 1: I start the test using the command ./mprime -m. During the first launch, there are…
Frontier_Setter
  • 123
0
votes
0 answers

How To Add Seconds To Date/Time Format of Prime95 Logging?

Prime95's default log format is MMM dd hh:mm e.g. Feb 26 07:16. I am using Thread Switcher for stability testing which works well switching every 5 seconds. I've had to increase this to 120 seconds in order to identify which cores need more voltage…
Metalshark
  • 286
0
votes
2 answers

Boot disc Dual-Core CPU stress tool?

Looking for a tool that can test a dual-core cpu via a boot disc, thus bypassing Windows (and ensuring that only the hardware is being tested). UBCD4Win's included Prime95 is an older version and it can't run two threads at once. Ditto for UBCD. Any…
ssvarc
  • 750
0
votes
0 answers

Prime95 larger FFT crush on Transmeta CPU

When I try to run Prime95 on a HP T5710(CPU is Transmeta TM5700@800Mhz), it works fine as long as FFT is not larger than 32k, it will immediately crush if FFT size equal or larger than 48k (only prime95 crush, no BSOD or other bad things). Why? With…
Sam
  • 1,180