I5 2500k not hitting 1.35v while running prime95 blend

Minmay

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Sep 13, 2015
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Decided to OC my 2500k to keep it a little bit more relevant. Went to 4.5ghz, used an overclockers guide. Started up a prime95 stress test, Voltage is sitting around 1.25 instead of 1.35. Wondering if I did something wrong? I read a bit about something called LLC and that could be an issue? My mobo is asrock extreme 3 gen 3
 
Solution
First of all, what PSU do you have?

Guides should be used for reference, not strictly adhered to. Overclocking is never an exact science and your overclock will always differ from someone else's, even if the hardware is exactly the same.

If the VCORE is set to auto, then the VRMs will always allocate more voltage to the CPU than it actually needs.

My advice is to disable the overclock, do some more research, gain a greater understanding of what you're doing and then revisit it. This is a good starting point; http://www.tomshardware.co.uk/forum/272214-29-wolfram-beginner-guide-overclocking.

The Prime95 blend test doesn't push the CPU to its limit but rather simulates a typical load. The small FFTs test is what pushes the CPU threads...
Hi Minmay :)

LLC (Load-Line Calibration) When the CPU is under load, its power draw increases. This in turn causes a voltage drop which is automatically compensated by the motherboard by increasing the applied voltage slightly. Some motherboards might therefore call this option Vdroop.

Normally LLC is an enable or disable setting. When overclocking, you always want to enable Load-Line Calibration.
Settings in Bios can range from low to extreme or by %. This will depend on the OC.

Here is a good guide to OC your CPU to 4.5GHz.
Go here: http://www.overclockers.com/forums/showthread.php/693613-Beginners-How-to-set-your-25-6-700K-to-4-5Ghz
And here for recommended settings: http://www.overclockers.com/forums/showthread.php/695941-2500K-at-4-0Ghz-with-Asrock-Extreme3-Gen3

P95 is an aggressive synthetic stress tester IMO and should only be used to test initial stability for 10 mins. Its algorithm intensifies on each pass and should be monitored constantly in conjunction with your temperatures.
P95 is not a real world test of your CPU and will stress your Processor to the MAX. Its like running your cars engine with the foot to the boards and keeping it there.
There are other real world testers to better attain stability.
Have fun and please post your results.
 
First of all, what PSU do you have?

Guides should be used for reference, not strictly adhered to. Overclocking is never an exact science and your overclock will always differ from someone else's, even if the hardware is exactly the same.

If the VCORE is set to auto, then the VRMs will always allocate more voltage to the CPU than it actually needs.

My advice is to disable the overclock, do some more research, gain a greater understanding of what you're doing and then revisit it. This is a good starting point; http://www.tomshardware.co.uk/forum/272214-29-wolfram-beginner-guide-overclocking.

The Prime95 blend test doesn't push the CPU to its limit but rather simulates a typical load. The small FFTs test is what pushes the CPU threads to their limits and that's what you should use to test for stability.
 
Solution