I5-3570K, Corsair H100i and Prime 95 temps

DylanShorkey · Mar 25, 2015

Hey there all, I am a long time lurker on this site, and I know you guys have the best input out there on OCing among other things, so any help would be appreciated.

Motherboard-Asrock Z77 Extreme6
CPU- I5-3570K
Cooler-Corsair H100im, brand new.

Heres my issue. I have my OC at a 4.3Ghz offset voltage set to -.055v, and with that it sits at 1.060v idle, at about 28c-30c, and on Battlefield the temp sits at around 55c, but testing with Prime95 it tops out at 90c. Load Line Cal is at level 3.

From what I've seen, this temp on Prime is high, especially with water cooling. I will provide all the info from my bios in this thread, so it should be all the info anyone needs, if you need more let me know and I will happily provide it. In the pics it says 4.2, but I changed it to 4.3 after the pictures, same with the offset voltage. Everything else is the same.

EDIT: I am going to put the pics in an imgur album, for some reason this thing is messing up the links.
Here they are

CompuTronix · Mar 26, 2015

Which version of Prime95?

Do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd, 3rd and 4th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.5, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces extremely high temperatures. The FPU test in the stability testing utility AIDA64 shows similar results.

Prime95 v26.6 produces temperatures on 3rd and 4th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a 35% larger Die.

Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run only Small FFT’s for 10 minutes.

Use Real Temp to measure your Core temperatures, as it was designed specifically for Intel processors: Real Temp - http://www.techpowerup.com/downloads/2089/real-temp-3-70/

Your Core temperatures will test 20C lower with v26.6 than with v28.5.

Please read this Tom’s Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Thanks,

CT :sol:

DylanShorkey · Mar 26, 2015

CompuTronix :

Temp is now at 73 consistent. Awesome. Is this still too high, or right around where it needs to be? I've seen people putting rubber washers behind their H100i brackets, and that has seemed to help dramatically as well. Thank you so much for this tip, though. Definitely relieving

CompuTronix · Mar 26, 2015

3rd Generation 22 Nanometer: 3570K / 3770K (TDP 77W / Idle 4W)

Standard Ambient = 22C
Tcase (CPU temp) = 67C
CPU / Core offset + 5C
Tjunction (Core temp) = 72C
Tj Max (Throttle temp) = 105C

Core temperatures in the mid 70's are safe.

What is your ambient temperature?

At 22C Standard Ambient, here's the typical operating range for Core temperature:

80C Hot (100% Load)
75C Warm
70C Warm (Heavy Load)
60C Norm
50C Norm (Medium Load)
40C Norm
30C Cool (Idle)

PLEASE READ this Tom’s Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Thanks,

CT :sol:

DylanShorkey · Mar 26, 2015

CompuTronix :

You're the best, thanks friend!

Karadjgne · Mar 26, 2015

Hard to tell if 73°C is a good temp or not. If you had a really good connection with cpu, good paste spread and good airflow as a base, then the underlying temp will be dominated by ambient temps and mounting location.

If used as intake, the h100i will be only temp'd by ambient, if used as exhaust, you have to take case temps into consideration, that includes heat from a gpu as well.

That said, 73°C is well within operating safe gpu temps.

Reason for washers is pressure on the die. While an adequate mount, with non-soldered cpus, a higher amount of pressure from the pump to cpu has shown to be able of lower temps. Whether this is from squishing the paste thinner and enabling better heat transfer or a general 'flattening' of the cpu lid itself and consequently the cpu Tim being more evenly distributed is not able to be determined, but cranking that pump down harder on the cpu definitely helps lower temps, sometimes as much as 10°C.

Also to consider are fan curves. Most default cpu fan settings for 100% duty cycle are set @70°C, so at 73°C you have just now reached full speed on the fans. Changing the fan curves to be slightly more aggressive will not change p95 temps as they are shown at max cpu output, but they will change temps at anything lower than a consistent 100% cpu load. The h100i sitting at 55°C during BF4 can be lowered to 50°C easily by faster fan speeds, a higher duty cycle setting.

CompuTronix · Mar 26, 2015

DylanShorkey,

What is your ambient temperature?

DylanShorkey · Mar 26, 2015

CompuTronix :

About 71F-73F.

DylanShorkey · Mar 26, 2015

Karadjgne :

I understand. I think I may have to change to exhaust. I'm using the Thor v2 case, and I feel like even with the GPU, I should do an exhaust for the radiator fans. I have a feeling that would help.

I would love to use the rubber washers, and I have that they should be 2mm but have no idea where to get them.

I will try your tips on the fan curve and post results. I appreciate the tips, once again Toms Hardware delivers people with answers. Thanks guys.

Karadjgne · Mar 26, 2015

Well to answer that, my ambient temp is 73°F, running a i5-3570K at 4.3GHz 1.208v with a h55 single Noctua fan, and p95 26.6 small fft and after 1/2 hr to allow for temp averaging on a liquid cooler, I pull 70°C.

So yes, I'd say your temps are a tad bit warm, the h100i should easily dominate my h55 in that regard, and also considering equitable test parameters between our systems otherwise.

That said, 55°C gaming and 73°C p95 is still well within safe operating temps and will in no way hurt either performance or lifespan, and after all, my temps are due to several hours of playing around with fan settings, and every tweak available to lower temps except for de-lidding.

CompuTronix · Mar 26, 2015

Standard Ambient temperature is 22C, which is normal room temperature, and is a reference value for Intel’s Thermal Specifications. Knowing your Ambient temperature is important because Ambient directly affects all computer temperatures.

As Ambient temperature increases, thermal headroom and overclocking potential decreases

Cx9/5+32=F ... or ... F-32/9x5=C ... or more simply ... an increase of 1C = an increase of 1.8F

30.0C = 86.0F Hot
29.0C = 84.2F
28.0C = 82.4F
27.0C = 80.6F
26.0C = 78.8F Warm
25.0C = 77.0F
24.0C = 75.2F
23.0C = 73.4F
22.0C = 71.6F Standard ... or ... 22.2C = 72.0F
21.0C = 69.8F
20.0C = 68.0F
19.0C = 66.2F
18.0C = 64.4F Cool

DylanShorkey · Mar 26, 2015

Karadjgne :

Its good to hear that I at least have a good starting point. I appreciate the info, I actually plan on using these Noctuas to replace the fans the H100i comes with. I've heard great things about Noctua, and they really are not too expensive. I can't wait to see how they do, I've heard they are the some of the quietest.

Karadjgne · Mar 26, 2015

For washers I went to Home Depot and in the plumbing section are small 00 o-rings used on faucets, and I backed them with smaller flat washers to allow for maintained pressure without metal contact on the mobo.

But then again, my gpu support is also the slide rule from my cordless circular saw adjusted to fit and painted black, so a little ingenuity can go a long way when it comes to mods on pc equipment.

The Noctua P-12's are excellent rad fans, superior to stock in every way, and that does include sound volume. At 900 rpm they are almost dead silent and only 3-6°C away from max, which in my book is negligible at anything under 70°C. My NF-F12 is set for a max speed of @950rpm, so if that's 70°C under p95, then flat out max would be @64-67°C but I prefer the quiet over such a minimal temp variation.

DylanShorkey · Mar 26, 2015

CompuTronix :

Beautiful. I feel great about overclocking knowing I have all of this information at my disposal now, especially that stickied thread. Simply awesome.

Karadjgne · Mar 26, 2015

Yeah, CT is the bomb when it comes to understanding Intel temps, and that sticky really is a sweet piece of work.

DylanShorkey · Mar 26, 2015

Karadjgne :

How well did the rubber washer work for you? Any dramatic differences in temp? What type of washer did you use for the smaller flat ones, metal, plastic etc.

Yeah I really can't wait to get them. For the price we really should recieve better fans, but hey I guess it is water-cooling, and since you can use any 120s you want I guess its a fair deal.

Karadjgne · Mar 26, 2015

My temps dropped @7°C roughly, lil hard to say exactly as I use realtemp and the widget on my task bar shows almost instantaneous temp changes due to any core usage, so temps can jump 20+°C in less than a second, just opening a high cpu usage app, but I went from @40-41 down to 33-34 at idle.

The flat washers were just some ultra thin ones that had a smaller o.d. than the rubber o-rings, that I had laying around in the garage in a 1000 piece nut and bolt box. They may or may not be of any actual use, but I was tinkering, and am not gonna pull them back off now, lol.

I5-3570K, Corsair H100i and Prime 95 temps

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