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9900K on air - too hot?

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post #41 of 50 (permalink) Old 01-29-2019, 04:07 PM
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I have a hard time cooling the 9900k 5.0ghz at 1.296v loaded with a bequiet dark rock pro 4 also. I think air cooling tops out at 4.9 - 5ghz depending on your chip on stock settings. If you are willing to delid your chip, sand down the IHS and cpu die, then that will reduce at least 10-15c. The way 9900k is being soldered and I still don't feel comfortable shaving the solder off the cpu die unlike my 8700k, which I can wipe it off with rubbing alcohol for the thermal paste Intel used.
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post #42 of 50 (permalink) Old 01-30-2019, 12:20 AM - Thread Starter
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Thanks to all for the comments and suggestions. I've tried everything from thin layer to too much paste and as you can see from my screenshots in earlier posts there is NO measurable difference. I'm not really interested in the delid or lapping methods so I think I'm going to leave it at this.

I'm leaving my overclock at 4.9 GHz all cores and setting PL1=180, PL2=240, and tau=5 seconds to avoid thermal throttling. I only hit those power limits when running Prime95 small (which I don't really care about) and then the chip downclocks/downvolts nicely after 5 seconds of high load. Otherwise it runs at 4.9 all cores all the time.

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post #43 of 50 (permalink) Old 01-30-2019, 04:50 AM
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Quote: Originally Posted by Luck100 View Post
I'm leaving my overclock at 4.9 GHz all cores and setting PL1=180, PL2=240, and tau=5 seconds to avoid thermal throttling. I only hit those power limits when running Prime95 small (which I don't really care about) and then the chip downclocks/downvolts nicely after 5 seconds of high load. Otherwise it runs at 4.9 all cores all the time.

thats more than enough, its very very rare for all cores to be heavily loaded at the same time for prolonged periods.

trolling an adult is very dangerous, don't try it at home nor at work. you don't want to play tag with a rabid man.
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post #44 of 50 (permalink) Old 02-01-2019, 07:18 AM
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You need a better cooler, period. The paste was making good contact the first time, as you demonstrated after reapplying.

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post #45 of 50 (permalink) Old 02-01-2019, 07:21 AM
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Quote: Originally Posted by Luck100 View Post
I'm leaving my overclock at 4.9 GHz all cores and setting PL1=180, PL2=240, and tau=5 seconds to avoid thermal throttling. I only hit those power limits when running Prime95 small (which I don't really care about) and then the chip downclocks/downvolts nicely after 5 seconds of high load. Otherwise it runs at 4.9 all cores all the time.
If the hero allows (I know Extreme and Gene do), you could set two core at 50x rest at 48 or 49. Use it normally for a week or so with a temperature log and check maximums daily.

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post #46 of 50 (permalink) Old 02-08-2019, 05:27 AM
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I thought my Noctua u12s would do the trick as it did for my previous 5.1ghz 8700k (why i thought that, not sure). I was VERY wrong, mind you, i delidded the 9900k(stock IHS). Temps still touch, too often, mid 90's. Using vcore ranges 1.3-1.37 is a no go. I'm going with the bigger copper IHS from rockit cool and reapplying the liquid metal TIM in the next couple weeks but it all indicates i wasted my money on the air cooler.

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post #47 of 50 (permalink) Old 02-08-2019, 01:14 PM
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Quote: Originally Posted by Luck100 View Post
And the results of prime95 is....one degree C lower. But I did remove sides and front. So I'm going to call it a wash.

What do you think of the scuffs on the thermal plate? Would that really matter? The worst scuff is off to the side, so I'm mainly thinking of the smaller marks toward the center. There's a few minor marks on the CPU IHS as well. It kind of looks like dust but a couple of passes with the microfiber shows it's not.
I have the 6-core 9600k, and also don't have panels on my case. And I'm also right at the 100C limit in P95. I had to turn off the heat and open the window in winter, and then I was maxxing at about 90C. I also seem to need a lot of volts to get near 5GHz working, I settled on 4.7GHz for now.

Maybe I just have regular chip, and not a golden sample chip.

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post #48 of 50 (permalink) Old 03-08-2019, 09:43 AM
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Even after rockit cool copper IHS, temps were still mid 80's while stressing. WTH, lol this is too hot, even after delid. Noctua 15s is the only thing close to keep it from melting. I'm currently on water so i wont get into details here but a regular 240 or a small 280 may not do it if you're trying to go 5ghz or more.

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post #49 of 50 (permalink) Old 03-08-2019, 07:23 PM
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I dont have one of those chips but from what Ive been taking in they do run hot.
My vote would be to forget air if you want to push it and pick up an good AIO like a H115I in the least. ccustom loop is better but also a lot more $$. East to test your if you are flat or not. If you can place the IHS down and spin it and it goes like a top you are convex. To check for concave lay a good straight edge like a metal rule corner to corner. If you can see light its definitely concave. If not try and see if you can slip a thin piece of paper in there. If anything they are usually high at the corners. Ive only had one convex chip since they added the IHS. I wish they had kept the substrate thick and just left the dies nekked. Those were the good old days.... Dies were always flat.

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post #50 of 50 (permalink) Old 03-09-2019, 03:49 PM
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Quote: Originally Posted by Yomny View Post
Noctua 15s is the only thing close to keep it from melting.
That's pretty much the best air cooler on the market.

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