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CPU & component temperture Stability with Prime95

Last response: in CPUs
June 13, 2011 1:33:42 AM

Hi there,

I just finished my first build and will be OCing CPU, GPU, RAM (maybe), plus SLI at a later time. Right now I want to know if the temperature for my current build is poor/good/excellent and stable. I used Prime95 to torture test my system and used core temp, cpu-z, hw monitor, speedfan and window task manager to gauge the temperature and that the CPU is running full throttle. Below are the Temperatures after running Prime95 for about 45 minutes. Is there a standard duration to run Prime95 to ensure the stability (temperatures) of my build is good for now and for what I want to do later (which is OCing and SLI). Thanks for your help guys.

CPU: Intel core I5 2500K Sandy Bridge (Will be OC later)
HSF: Cooler Master Hyper 212 Plus (Artic silver 5)
MOBO: ASRock P67 EXTREME4 (B3) LGA 1155 Intel
GPU: EVGA GeForce SC GTX 460 (will SLI later)
RAM: CORSAIR Vengeance 8GB DDR3 1600 (Maybe OC later)
SSD: Kingston SSDNow V+100 SVP100S2/96G (Tweaked)
HDD: Seagate Barracuda ST31000524AS 1TB 7200RPM SATA 6GB
OD: LITE-ON CD/DVD Burner - iHAS124-04
PSU: Corsair Enthusiast Series TX750 v2 750-Watt 80 Plus Bronze Certified
CASE: LIAN LI Lancool PC-K63 Black Steel ATX Mid Tower
OS: Window 7 Professional

CoreTemp (0.99.8):
TJ.Max: 98
Core#0: 49
Core#1: 47
Core#2: 52
Core#3: 50

Speedfan (4.43):
GPU: 33
System: 33
CPU: 39
AUX: 35
HD0: 27
HD1: 30

CPUID HW Monitor:
Core#0: 48
Core#1: 46
Core#2: 51
Core#3: 49
SSD: 27
HDD: 30
GPU: 33

SYSTIN: value: 33 min: 32 max: 33
CPUTIN: value: 64 min: 0 max: 128
AUXTIN: value: 0 min: 0 max: 64

I do not know exactly what these three values mean but the CPUTIN I believe is supposed to be the actually CPU. CPUTIN value would only change from 0 to 64 to 0 and back to 64. That kind of got me worry there. Is temperature reading broken?

a b à CPUs
June 13, 2011 1:50:53 AM

Those temps look fine, and as long as you don't apply too much over-voltage, you should be able to overclock with no problems.

For a long-term Sandy Bridge overclock:
1. Keep the peak Prime95 core temp below 75ºC
2. Keep the CPU voltage below 1.4v

Don't worry about those three extra temps.
June 13, 2011 2:44:58 AM

Thank you for the advice with overclocking. So the temperature is good with my aftermarket HSF, because it is my first build and I was a little nervous with apply the Thermal paste. I use the three small line method with the Cooler Master Hyper 212 Plus. I did not pick up the HSF after applying the thermal paste to check if the thermal paste was spread out right or if it was too much or too little. After I screw in all the areas that needs tightening I accidentally move the HSF. Well, move as twisted it slightly in place and so I twisted it back. Is the HSF supposed to be able to move (twist circular motion) or should it be rock stable and not movable?
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June 24, 2011 2:12:45 AM

From other threads I saw some people with the same CPU with factory HSF have the same idle and similar load temperature as mine and another person with the same CPU aftermarket HSF have temperatures 18* idle and under game load like crisis 2 max resolutions setting on 1080p to only hit 37*. I know Leaps-from-shadows says my temperature looks fine, but should it be lower? I do have 1 x 120mm Blue LED Rear Fan, 2 x 140mm Blue LED Front Fans and 2 x 140mm Top Fans running full.

I would like it if others with similar components, especially with 2500K and Hyper 212 plus HSF let me know their temperatures both in idle and under load (what stress test and duration). I also notice my temperature is about 8-10*C higher in my bios then on Speedfan; does anyone have this issue with such a significant difference. Thanks.

Best solution

a b à CPUs
June 24, 2011 3:41:51 AM

BIOS temps will always be higher, as the CPU cannot go into low-power idle mode until it is fully booted into Windows.

Prime95 loads the CPU much more than any game will. That's why the Crysis 2 temps are lower than your Prime95 temps. Also, CPU temps depend a lot on your ambient temps -- getting 18ºC idle would require a pretty cold room to begin with.

Your temps are fine. If somebody saw a real problem they would have spoken up in the 11 days since the first post.
June 24, 2011 5:07:44 AM

Best answer selected by SCSandyBOC.