i5 7600k Overclock question

Those temps seem very low for Hyper 212... are you sure you are looking at core temps and not CPU package temps ?

http://www.vortez.net/articles_pages/intel_kaby_lake_core_i5_7600k_amp_core_i7_7700k_review,5.html

CLC type water coolers use low cost aluminum radiators which suffer from aluminum's lower heat transfer coefficient, combined with weak pumps, they are unable to catch cool as well as air coolers which are also lower cost... even with the extreme rpm fans typically used for them to "get close".

After Sandy Bridge, we stopped using AIDA and P95 .... a) you can damage your CPU easily if you don't account for the significant voltage boost (+0.13) that occurs when AVX instructions are present. Your 1.275 jumps to 1.405 when this happens. The issue is that synthetic stress tests like this can continually hammer a CPU in a manner it will never again experience. It's kinda like living on Long island, NY (Elevation range 0 - 400 ft amsl)and wondering whether your car can tow the new boat (2500 pounds with trailer) you want to by, by testing your car's performance pulling a 20 ton dump truck up a 12% grade at elevation of 13,000 feet up in the rocky mountains. In addition, as the synthetics don't test in a multitasking environment, you can be P95 / AIDA stable and fail in an application based stress test like RoG Real Bench

Using RoG Real Bench along with HWiNFO for system monitoring will give you a safer, more reliable OC ... and likely higher as temps in real life applications will be lower than with the synthetics.

http://rog.asus.com/forum/showthread.php?43233-Realbench-v2-Discussion-Thread-Download-Links
http://www.hwinfo.com/download.php

My thinking is:

Up to 1.200v = Very Good Air Cooler (Hyper 212)
Up to 1.250v = Best Air Coolers (Phanteks PH-TC14-PE, Silver Arrow or Noctua DH14) ....... Dual 140mm CLC / AIO Cooler w/ 1500 rpm fans (Corsair H110)
Up to 1.275v = Extreme Speed Dual Fan CLC / AIO w/ 2700 rpm fans (too noisy for most folks)
Up to 1.287v = Best air coolers (Cryorig R1 / Noctua DH-15)
Up to 1.300v = Swiftech AIOs ( Swifteh H220-X / H240-X)
Up to 1.325v = Custom Loop w/ 15C Delta T (3 x 120mm / 140mm) *
Up to 1.400 = Custom Loop w/ 10C Delta T (5 x 140mm or 6 x 120mm) *

* At this level having the GPU(s) also under water is assumed

JackNaylorPE has a good analogy about running the synthetic stress tests (Personally I use OCCT-Small (30 mins) for checking temps and OCCT-Large (3 hrs) for checking stability) However, I do not agree with the vcore/cooler chart.

I have a EVO 212 and have no issues running a 1.3Vcore. I would load OCCT and run OCCT-Small for 30 minutes and see what your temps are. If temps are <80C then run OCCT-Large for 3 hrs to ensure you are stable.

Question: Are you running a manual vcore of 1.275 or are you leaving it in AUTO? I would recommend using a manual voltage while OC’ing then once you find the minimum vcore required to keep the maximum clock stable. You could go back to auto and use an offset to keep the voltages at the minimum required.

That chart came from Asus web site ... I added in some of the categories in the middle. It is designed for worse case scenario.... in many climates summer temps can be 10 - 15C or more above winter temps and change in ambient - change in CPU temps as it's all based upon Delta T ... so your 75C CPU temp at 68F room temp will be to 85C at 86F room temp.... 93C at 100F

OCCT **is** a synthetic test, actually it's a "suite" of other synthetic tests. You can pass OCCT, Prime 95, AIDA 64 just fine and then fail under a multitasking benchmark which uses real applications.

Agree. I just think the OP will be fine with his cooler with a 1.3Vcore. I don’t see a need to go to liquid cooling for his needs.

Agree. They are all synthetic tests and what really matters is real world applications. Current Prime95 generates unrealistic HIGH temps. AIDA64 on the other hand produced unrealistic LOW temps, and I found that I could run all AIDA64 tests stable but easily fail real world applications. For me OCCT produced temps that are at the realistic high end of my real world applications, and when I pass the OCCT stability tests I can feel pretty sure I am stable. At most, may need to bump Vcore up by 0.010V.

So, there are many synthetic thermal/stability tests to choose from, but what really matters is being stable at good temps running real world applications. For me, I found OCCT to produce the most comparable results in the most efficient manner while trying to find the highest clock at the lowest vcore while keeps temps <80C.

The Hyper 212 is a "great cooler for the money"... but the last 3 words are often left out of the characterization. Without the last 3 words "great cooler" does not apply. A "great cooler" would be one that takes CPU temps out of the equation when overclocking. Your OC will be limited by one of 3 things:

a) Your chosen Temperature Limit
b) Your chosen Voltage Limit
c) Stability (which depends on the other two)

A "great cooler" takes a) above out of the equation. The Hyper 212 will get you a decent OC but not a 5.1 Ghz at 1.4volts

1. Agree. I just think the OP will be fine with his cooler with a 1.3Vcore. I don’t see a need to go to liquid cooling for his needs.

2. Agree. They are all synthetic tests and what really matters is real world applications. Current Prime95 generates unrealistic HIGH temps. AIDA64 on the other hand produced unrealistic LOW temps, and I found that I could run all AIDA64 tests stable but easily fail real world applications. For me OCCT produced temps that are at the realistic high end of my real world applications, and when I pass the OCCT stability tests I can feel pretty sure I am stable. At most, may need to bump Vcore up by 0.010V.

Click to expand...

1. I think so too, but it's a matter of approach that I think we differ. .... I chose to couch my recommendation since I do not know their particular environmental or other factors ... I am 100% sure that list is **safe** for all but desert conditions and with any CPU. Both environmental factors and the silicon lottery can conspire to raise CPU temps significantly. One CPU may require 1.2volts to hit a given OC, another might need 1.35v

I feel that those numbers are safe for all CPUs, even the worse 5% ... I **think** most should be able to handle 1.3v, but not all.
I feel that those numbers are safe for most all environments, even 85-90F ambient ... I **think** most should be able to handle 85-90F at those CPU temps, but not all.


No argument there ... my issue if this however ... what I have found is that i can do AIDA 64, Prime P95, OCCT and pass 24 hour stable ... and then fail running real world applications.

All good info. And as you know what his particular system will do will be dependent on his piece of silicon.

The OP’s original question was if he should upgrade his cooler. As has been pointed out Prime95 produces unrealistic high temps and for me AIDA64 has produced temps lower then I see with real world applications. If I were him, I would run OCCT-Small just to see what I get for temps. If his temps are staying below 80C at 4.9GHz with a Vcore of 1.275 (or 1.3, still not sure if he is in auto or manual) then I would say no he doesn’t need to upgrade his cooler (assuming he is stable at these settings).

Im using also 7600k on D92 coolermaster. Idle temp 32 max 55-60. I want to overclock it from 3.8 to 4.2-4.8

How much temp needed forstable from idle and gaming? Using asus tuf mark 1

Jack going by your logic nothing would work on the kaby lake as it's throttled by temps regardless unless you get a good chip.

People constantly knock the AIO coolers used today but people still get them because they work. You're nitpicking a pre-package deal.

The only "good cooler" out there is custom loop or exotic cooling.

High end air, most AIO, and expensive thermoelectric coolers all cool just as good as the next.

The hyper 212 always receives a bad rap because it doesn't sufficiently dissipate heat in most cases. You've gotten a good chip so you're lucky. Google around Toms hardware for how many people have posted "my temps are high" and it's ALWAYS a 212, a BAD (broken), improperly fitted or configured AIO, or stock intel cooler.

When overclocking you need to set the avx multiplier so it downclocks under AVX instruction so it doesn't have an issue. My chip doesn't overvolt under avx so I have no clue what you're talking about whatsoever.

Use prime95 v26.6 for a good thermal testing using the large fft most thermals setting.

"Torturing" your cpu as people seem to call it shouldn't do anything to it whatsoever. The only things that effectively reduce lifespan is 1.4 volts or more, or exceeding 80c for extendex periods of time. Otherwise you're fine.