2500k 5.2ghz on air.. question

nightrider1470 · 21 Mar 2017 at 23:37

I have my 2500k stable on air @5.2ghz... Vcore is 1.56v

I notice core temp and CPUID report 5.2ghz. but as soon as I run prime95 the frequency drops much lower?.….. is prime95 not taxing it enough? Or maybe a setting needed in the bios?

Bluntwrapped · 22 Mar 2017 at 00:10

Lol your CPU is throttling that voltage is insane

iBSOD · 22 Mar 2017 at 00:23

1.56? lmao how are you cooling that, delta fans on a NHD15?

nightrider1470 · 22 Mar 2017 at 08:30

Yes it's NHD15

What should I do?....

Why is it throttling?

wedrum · 22 Mar 2017 at 08:32

drop it down to 4.8ghz on around 1.37v

nightrider1470 · 22 Mar 2017 at 08:46

So throttling doesn't allow it to run fully at 5.2ghz?

I only use my PC for an hour or two of VR gaming the odd day a week.

edscdk · 22 Mar 2017 at 08:57

its throttling to protect itself from overheating and blowing up... primes 95 is a worst case not real world test so it might not throttle in normal usage

nightrider1470 · 22 Mar 2017 at 09:37

Ahhhhh, I see.

Well I will test with some actual games and see how it performs.

Would installing a all in one water-cooling kit help Vs my NHD15?

nightrider1470 · 22 Mar 2017 at 11:58

What's the bios setting called? That runs the frequency much lower when not needed, but still has the headroom when needed to 5.2ghz.

Speedstep?

iBSOD · 22 Mar 2017 at 14:14

nightrider1470 said:
Ahhhhh, I see.

Well I will test with some actual games and see how it performs.

Would installing a all in one water-cooling kit help Vs my NHD15?

http://www.tweaktown.com/reviews/73...formance-liquid-cpu-cooler-review/index7.html

Looks like a H115 will take about 6/7c off. What volts do you need for 5ghz?

nightrider1470 · 22 Mar 2017 at 14:42

I will look to lower down to 5ghz and let u know... That might be the best thing for me to do in the long run

edscdk · 22 Mar 2017 at 14:50

nightrider1470 said:
What's the bios setting called? That runs the frequency much lower when not needed, but still has the headroom when needed to 5.2ghz.

Speedstep?

if you question relates to the thermal throttling that's NOT the option you want... you cannot (I don't think) turn off thermal throttling, if you could disable the option your CPU would likely blow up (well I guess intel build in some tolerance you dont want it literally getting within 1 degree of blowing up)

VKleita · 22 Mar 2017 at 15:22

This is the same as a car with a RPM limiter and your bouncing off it hard.

It doesn't matter how good your cooling is, inside the chip you are burning so much voltage that the sheer heat being made inside is causing it to get too hot so it throttles to prevent the pistons coming out of the bonnet

Personally (others will disagree) I would say that voltage is too high for daily use, but its your machine, just remind me to never buy a second hand car off you

zipp0r · 22 Mar 2017 at 22:51

1.56v you are nuts!!
1.35-1.4v is the best (and safe) range for these cpus

andy_mk3 · 22 Mar 2017 at 23:03

98°C is why it's throttling down

Hotwired · 22 Mar 2017 at 23:07

I like the way you were worried about the clock speed and had no interest in the temperature.

It actually has the temperature limit listed above the cpu temps. The limit that one core is in fact on.

nightrider1470 · 23 Mar 2017 at 15:14

Update...

I clocked back to 5ghz @1.49V and added a second fan on my air cooler and temps are 31 idle, max 81

I ran prime95 for 30 mins and 3Dmark for 30 mins and no issues.

Yes I should have ran prime95 longer, but I doubt a VR game with hammer my CPU like prime95 does.

Going to game and enjoy and any blue screens I will investigate further

Devrij · 29 Mar 2017 at 12:08

Running prime at those volts and temps is a good way to rapidly degrade your cpu through electromigration. If you're not fussed about the lifespan of your cpu (it is an old chip after all so maybe you're upgrading soon) then carry on.

Fair play to having a go though!