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Core i5 2500k safe 24/7 overclocking @ 4.0-4.5 GHz

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October 5, 2011 5:17:43 PM

Hello people!!

I have a question regarding the i5 2500K oveclocking @ 4.0 GHz or max 4.5GHz BUT consider that i need this thing for 24/7 so i dont want to stress it much. Running full load in stock clocks brings me the temperature of 58C on cores and 47C on CPU and idle on cores is 29C and on CPU is 20C.

My system is:
CPU: Intel Core i5-2500K Sandy Bridge-based 3.3 GHz CPU
CPU Cooling: Cooler Master Hyper TX3
Motherboard: Gigabyte P67A D3 B3 (s1155, P67, DDR3)
RAM: G.Skill Ripjaws X 8GB DDR3 1333MHz (2x4GB kit)
Graphics Card: MSI GTX 460 OC Edition GDDR5, 1GB 725/1450/3800
Hard Drive: SSD Crucial M4 64GB SATA III 6gb/s
Hard Drive 2: Western Digital Caviar Blue 500GB SATA III
Power Supply: CoolerMaster GX Series 650W PSU


Im reading generaly that the only thing to do to get it working above 4.0 GHz is by switching the multiplier to 40x and up, then save bios and exit, but im sure its not only this...


Thanks in advance for your answers!
October 6, 2011 12:51:37 PM

No problems detected after 20 linX runs with 4096k memory used while the cpu-z shows 1.056 core voltage, bios says 1.296 Vcore, the cpu running @ 4.0GHz with 40x multiplier with 1333Mhz stable ram, auto CPU PLL, disabled intel turbo boost and everything else on default. The temps on cores are max 65C and average 58,4C and CPU temps max 54C and average 48C.

Tell me your opinions on that.
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a c 97 à CPUs
a b K Overclocking
October 6, 2011 8:56:08 PM

65 C under load? Under load anything under 70 degrees C is considered great. I like to see idling between 35 and 45 degrees C.

Run your system for a few days in the normal mode that you use your computer just to make sure that the system is stable.

My i7-920 overclocked to 3.82 GHz idles at around 30 degrees at an ambient of 22 degrees. My voltage is 1.275 V.
October 7, 2011 2:48:58 PM

Ok, because of the low Vcore voltage in Cpu (1.296v) nvidia driver crashed and recovered by itself. So i've turned it to auto tested with prime95 for 10 hours 0 errors 0 warnings. The settings for 4.0Ghz that worked for me are the below:
Multiplier -> 40x
RAM -> 13.33
Voltages -> AUTO
disabled the CPU PLL, Intel turbo boost and the change in core clock inside the OS.
Everything else stayed on defualt and auto.
Max temps were 54 for CPU and 66 for cores after the 10 hours of testing.
a c 309 à CPUs
a c 121 K Overclocking
October 7, 2011 3:24:11 PM

My take is, that if you do not artificially up the voltages, you are safe for long term usage. Leave it on AUTO.

The upper limit of cpu temperature is about 95c.
If your cpu approaches that, it will downclock itself to protect itself.

When testing, use cpu-Z or such to verify that your multiplier is staying at max for the test.

I see no problems here.
a c 97 à CPUs
a b K Overclocking
October 7, 2011 4:03:06 PM

dos659 said:
Ok, because of the low Vcore voltage in Cpu (1.296v) nvidia driver crashed and recovered by itself. So i've turned it to auto tested with prime95 for 10 hours 0 errors 0 warnings. The settings for 4.0Ghz that worked for me are the below:
Multiplier -> 40x
RAM -> 13.33
Voltages -> AUTO
disabled the CPU PLL, Intel turbo boost and the change in core clock inside the OS.
Everything else stayed on defualt and auto.
Max temps were 54 for CPU and 66 for cores after the 10 hours of testing.

You are doing great! Enjoy your system!
!