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Is delidding a 9900k worth it?

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post #1 of 83 (permalink) Old 01-06-2020, 02:03 PM - Thread Starter
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I've lapped a cpu in the past and will probably lap my cpu die unless I get the rockit kit thing with the bigger pre lapped die but

I saw a YouTube video of someone delidding a 9900k then he scraped off the solder interface, then he lapped the actual silicon on the chip, and I'm wondering how that could possibly be safe. He claimed to get like something like 15C cooler off of it. He removed like a quarter of the silicon on the chip

What I'm wondering is would this be detrimental to the cpu in ways you can't really notice with a stress test? Why would Intel make the chip way thicker than normal? Apparently the thermal conductivity of silicon is much lower than copper and the claim was that going through that fraction of a millimeter of the chip is the main reason why Temps can't be controlled on the 9900k even with the best aio there is. Personally I hate aio coolers and tried one and a 240 rad won't even bolt to my spec 02 case so I'm gunna get a dark rock pro 4 or a noctua d15 chromax. By the way are those perfectly flat and true on the bottom or should they be lapped too?

I'm 100 percent going to have a lapped cpu even to get 2C out of itbecause that makes the noctua keep up with the best watercooling there is even though I know the reason people lap is for liquid nitrogen and the fact it cracks the thermal compound from convexing

But yeah is it worth it to rip my IHS off my cpu, then scrape off the solder then sand a quarter of the silicon off my chip? I wanna overclock my 9900k and it's stock for now til I pick my best thermal solution but it seems like even the best coolers in the world can end up near 100c on these chips and honestly short of trading my Intel mobo and cpu for an AMD thatcan be tamed I don't know what to do about this


Edit: I read up somewhere on reddit and someone was talking about the equation of thermal conductivity of the chip and claimed the cpu would have to produce something like a 900 watt TDP to even have that little bit of silicon sanded down matter to drop the Temps 15C, if that's the case would delidding and liquid metal work almost as s good as sanding the chip?

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post #2 of 83 (permalink) Old 01-06-2020, 02:27 PM
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sanding the die is really just lapping the die. the important bits are the inside and you're not sanding down to the internals (and if you do then you goofed).

Silicon Lottery said delidding and sanding the die was usually only good for 3-7c on average for Coffee Lake but AFAIK that's with re-lidding afterwards.

is 7c lower temps going to get you to clocks that you couldn't get to previously? if yes, then lap. if no, then don't.

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post #3 of 83 (permalink) Old 01-06-2020, 02:46 PM
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Quote: Originally Posted by ObiWanShinob1 View Post
I've lapped a cpu in the past and will probably lap my cpu die unless I get the rockit kit thing with the bigger pre lapped die but

I saw a YouTube video of someone delidding a 9900k then he scraped off the solder interface, then he lapped the actual silicon on the chip, and I'm wondering how that could possibly be safe. He claimed to get like something like 15C cooler off of it. He removed like a quarter of the silicon on the chip

What I'm wondering is would this be detrimental to the cpu in ways you can't really notice with a stress test? Why would Intel make the chip way thicker than normal? Apparently the thermal conductivity of silicon is much lower than copper and the claim was that going through that fraction of a millimeter of the chip is the main reason why Temps can't be controlled on the 9900k even with the best aio there is. Personally I hate aio coolers and tried one and a 240 rad won't even bolt to my spec 02 case so I'm gunna get a dark rock pro 4 or a noctua d15 chromax. By the way are those perfectly flat and true on the bottom or should they be lapped too?

I'm 100 percent going to have a lapped cpu even to get 2C out of itbecause that makes the noctua keep up with the best watercooling there is even though I know the reason people lap is for liquid nitrogen and the fact it cracks the thermal compound from convexing

But yeah is it worth it to rip my IHS off my cpu, then scrape off the solder then sand a quarter of the silicon off my chip? I wanna overclock my 9900k and it's stock for now til I pick my best thermal solution but it seems like even the best coolers in the world can end up near 100c on these chips and honestly short of trading my Intel mobo and cpu for an AMD thatcan be tamed I don't know what to do about this


Edit: I read up somewhere on reddit and someone was talking about the equation of thermal conductivity of the chip and claimed the cpu would have to produce something like a 900 watt TDP to even have that little bit of silicon sanded down matter to drop the Temps 15C, if that's the case would delidding and liquid metal work almost as s good as sanding the chip?
I know someone who removed 65% of the die (silicon nitrate). He did it for a Clevo LGAbook install, along with a custom machined IHS (lower Z-height). He had the die height lower than an 8700K's die. Worked fine and more than 20C temp drop. He was not using direct die however.

I would NOT sand the die unless you actually KNOW you want to sand the die or need to know you want to sand the die.
Delidding and using the rockit cool direct die frame is good enough. Hell, you can just delid and use the rockit cool copper IHS. That's enough. Or buy the tuning plan, delid, sand the IHS flat, reseal.

The reason why you don't want to sand the die when you use a direct die frame is, the rockitcool frame is designed for default die height. If you sand the die, you also have to sand the frame to compensate.
Don't buy the Der8auer frame. Only people who hate themselves buy the Der8auer frame.

Sanding the Intel IHS flat will give you a good improvement also. However you can kiss your primary warranty goodbye. I do *NOT* know if Intel will still do their advanced tuning plan on sanded IHS's. I know nothing about stock IHS's that were delidded and resealed pristine for the primary warranty, but they will accept the tuning plan for delidded processors that are relidded first, but a sanded IHS...um...you will have to ask someone else about that. There was absolutely nothing on their website that said that you can't sand the IHS and still do their replacement tuning plan, and since nothing says you can't, they would have to honor a replacement if it died from too much voltage. To be honest, you would have a similar issue if you used LM on the intel IHS and it wore out the etching. GG normal warranty, Tuning plan should still cover that. If you care about your warranty, use the rockitcool IHS.

Here's some advice for you.
If you DO want to sand the die, buy some pressure paper so you can do a dry mount BEFORE Sanding anything to check for pressure and balance.

https://www.amazon.com/Innovation-Co...dp/B07CKHRKHQ/
If you're cheap, you can get a free sample from sensorprod (ask for Fujifilm Ultra Low Prescale). They DO give free samples, but you have to be very polite about it. And then they want you to buy more ($$$$$).

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Last edited by Falkentyne; 01-06-2020 at 02:52 PM.
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post #4 of 83 (permalink) Old 01-06-2020, 02:48 PM
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Hi,
You'd be flushing a intel 3 year warranty down the drain.
Beside that not really soldered and all you have a 50-50% chance of damaging the die.

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post #5 of 83 (permalink) Old 01-06-2020, 03:30 PM
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To me it was worth it. I actually just delided direct die cooling on mine and saw a 15c+ reduction with liquid metal. If I recall correctly my temps were 90c-95c on 5.1Ghz 1.32v LL6 Cinebench R20, same settings delided I get 78C tops.

If you’re going to delid just go all out and direct die. But that’s just me I like to squeeze every potential I can from my products. I can do 5.2Ghz but voltage becomes a problem at 1.45v LLC5 171AMPS and a reputable source told me that’s too high for daily use. Temps top at 85C.

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post #6 of 83 (permalink) Old 01-06-2020, 05:33 PM
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Quote: Originally Posted by ntuason View Post
To me it was worth it. I actually just delided direct die cooling on mine and saw a 15c+ reduction with liquid metal. If I recall correctly my temps were 90c-95c on 5.1Ghz 1.32v LL6 Cinebench R20, same settings delided I get 78C tops.

If you’re going to delid just go all out and direct die. But that’s just me I like to squeeze every potential I can from my products. I can do 5.2Ghz but voltage becomes a problem at 1.45v LLC5 171AMPS and a reputable source told me that’s too high for daily use. Temps top at 85C.
Who might that reputable source be?

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post #7 of 83 (permalink) Old 01-06-2020, 08:28 PM
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Lol! I dont recall giving you a +Rep for that advice. Anyway +Rep.

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post #8 of 83 (permalink) Old 01-09-2020, 08:24 AM
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for me delidding my i9 9900kf I went down 6c from 93 to 87 under full load. and now I went direct die with rocket tool and temps never go above 82c so I gained another 5c with direct die, not bad for a 11c drop and temps don't creep up anymore. the vrms get hotter then the cpu now so yes its worth it.

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post #9 of 83 (permalink) Old 01-09-2020, 09:12 AM
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Can the Rockit88 be used for a 9900K or is the 89 a def requirement?

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post #10 of 83 (permalink) Old 01-11-2020, 04:11 PM
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The Silicon Lottery service for delidding means they'll do so and guarantee they won't mess up your CPU? If they delid it, does that mean your CPU is ready for a rockit cool direct die frame install? Will the rockit cool direct die frame make any diff. with high end air coolers like the DH-15 or the Le Gran Macho?
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