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Prime95

Last response: in Overclocking
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April 24, 2012 5:18:22 AM

When using Prime95, how long should you test your system for stability? I usually run for 1-2 hrs. How do you really know if your system is stable? What is a good goal to reach in terms of stability. I only play BFBC2 and Runescape for now. I ran Prime95 and it failed after 4 hrs on Worker 4. Thanks!

Here is my system:
Intel i5-2500k Processor (OCed to 4.5 GHz with vCore at 1.33v)
GIGABYTE Z68X-UD3H Motherboard
CM Hyper 212 EVO
Corsair Carbide 500R case (default fans)
PC Power and Cooling Silencer MK 950W PSU
Sapphire Radeon 7950 1000 MHz edition

Currently, after 1hr 31mins, my core temps are:
Core 0 = 70
Core 1 = 75
Core 2 = 76
Core 3 = 73

More about : prime95

a c 184 à CPUs
a c 149 K Overclocking
April 24, 2012 5:45:20 AM

1-9 hours. Run it when you sleep or go out some where. I personally test for stability for ~5-7 hours or go to sleep and have prime 95 running and then see what happens. Say I go to bed and then wake up the next morning to a system that either is still in windows or is completely unresponsive.
April 24, 2012 5:53:46 AM

amuffin said:
1-9 hours. Run it when you sleep or go out some where. I personally test for stability for ~5-7 hours or go to sleep and have prime 95 running and then see what happens. Say I go to bed and then wake up the next morning to a system that either is still in windows or is completely unresponsive.

Well after 1hr 45 mins my system just shut down without warning, but no errors appeared in BIOS.
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a c 218 à CPUs
a c 105 K Overclocking
April 24, 2012 6:02:31 AM

Those temps are just a tiny bit higher than I would be comfortable with. Personally I would keep the highest core at ~72C.

What RAM do you have? Make sure it's 1.5v. I would say drop the voltage just a bit but you are not stable obviously if it crashed. Maybe try 4.4Ghz and 1.3v.
a c 184 à CPUs
a c 149 K Overclocking
April 24, 2012 6:02:41 AM

Must mean it's overheating. You should be able to hit 4.5 at a lower vcore, preferably around 1.3v
April 24, 2012 6:05:41 AM

The temps were:
Core 0 = 70
Core 1 = 76
Core 2 = 76
Core 3 = 75
a c 218 à CPUs
a c 105 K Overclocking
April 24, 2012 6:12:04 AM

That's not WAY too high but as I said above I like to keep Sandy Bridge temps in the low 70s max.
April 24, 2012 6:14:28 AM

I will try 4.4 and 1.3vcore and report back. Hopefully I can post back in an hour. If not, probably tomorrow afternoon.
Also, my RAM is Crucial Ballistix sport 2x4GB RAM. I ran memtest86 and no errors were reported. Earlier, I got a rounding error, so I ran memtest86 and it passed, so I don't think it is RAM. I didn't think OCing would be this difficult for me.
a c 218 à CPUs
a c 105 K Overclocking
April 24, 2012 6:19:39 AM

Just a matter of finding your CPU's sweet spot. Hell overclocking Sandy Bridge is easy compared to the old days but it's still trial and error.

Your RAM is 1.5v right?
April 24, 2012 6:35:01 AM

Yep, 1.5v.
April 24, 2012 4:53:03 PM

Here are the results after running Prime95 overnight:


Are they good? Explain please. Thanks. :) 
a c 218 à CPUs
a c 105 K Overclocking
April 24, 2012 9:20:21 PM

No errors is as good as it gets. Also your temps look great. Looks like you found your chip's sweet spot. You at 1.3v?
April 24, 2012 10:52:11 PM

Yep, I tried your settings. I wish I was good at OCing like you. :p 
a c 218 à CPUs
a c 105 K Overclocking
April 25, 2012 1:21:35 AM

Hey, you have to start somewhere. I started with a Pentium II back in the late 90s. Some of the guys on these forums have been doing it since the early 80s! It's just a matter of try it until it works. Just keep at it and it won't be long until someone is thanking you for telling them some settings that work. ;) 
April 25, 2012 7:51:42 AM

I asked in computerforum.com, and they said my temps are higher than they should be.
a c 218 à CPUs
a c 105 K Overclocking
April 25, 2012 4:46:16 PM

Temps look fine to me. Not all chips are created equal. As long as your highest temps are in the low 70s you are fine for long term stability and chip life.
!