Delidding Q's

Burr · 13 Jul 2017 at 16:54

OK, so they're doing this to deter overclocking?

"To illustrate our point, we plotted the temperature for all of the Core i9-7900X’s cores at stock settings running Prime95 or LuxRender. A good custom water-cooling loop does fairly well, which shouldn't come as a surprise. However, no other thermal solution will be able to keep up. Even the motherboard manufacturers we spoke to agree, telling us about their all-in-one liquid coolers running out of headroom as soon as they ran Prime95 without limiting AVX." - Tom's Hardware

ZXSpectrum · 13 Jul 2017 at 17:23

I have 3 systems currently testing. 7900X Overclocked to 4.4Ghz on all cores with a -2 offset for the AVX and I get 86 Degrees max with a Corsair H100. :eek:

In a hot burn in room with other systems and no AC.

Burr · 13 Jul 2017 at 17:27

Well that runs counter to what a whole lot of review sites/folks are saying. So unless AMD are paying sites to poop on Intel...

Gerard · 13 Jul 2017 at 18:34

Just delidded my cpu and done the deed. Waiting an hour or so for the glue to dry then gonna plonk it in.

Burr · 13 Jul 2017 at 18:48

Gerard said:
Just delidded my cpu and done the deed. Waiting an hour or so for the glue to dry then gonna plonk it in.

Let us know how ya get on mate. At least you can now say you've done it. Hopefully years from now, it'll be funny, having to tell folks that once upon a time we had to delid our cpu's cause of crap thermal paste.

ZXSpectrum · 13 Jul 2017 at 18:53

Burr said:
Well that runs counter to what a whole lot of review sites/folks are saying. So unless AMD are paying sites to poop on Intel...

I found the same at first after seeing people having issues with temps hitting 99 degrees after hours of testing with realbench, aida64, prime95, Intel XTU. But still no throttling or crashing. Then I found this:

http://wccftech.com/intel-core-i9-7900x-10-core-overclocking-aio-cooling-5-ghz/

Confirmed with a colleague who specialises in Overclocked CPUs for high frequency trading market. He is currently developing platforms using the 7900X and has had the same results.

While I understand he probably has a cherry picked chip, 4.4ghz @ 1.15v on a H100 doesn't seem to have an issue. No crashing or throttling. Max temps 86 degrees less with AVX workloads (expected as it's running at 4.2ghz) maybe it's a great batch. Maybe not... great performance as well with 2460 Pts in cinebench.

I am going on hands on experience with the cpus... now the 7800X is another story!

8 Pack · 13 Jul 2017 at 19:02

Good 7900X are 4.7-4.9 at 1.225-1.25V none avx prime, real bench etc stable. Triple aio or above needed for cooling though if your hammering with high loads.

ZXSpectrum · 13 Jul 2017 at 19:03

Haha! I thought that you were asleep!

8 Pack · 13 Jul 2017 at 19:07

No need to comment. I am working on pre tested delidded Kabylake X and Skylake X cpu's. Kabylake upto 5.3 and skylake upto 4.9

Burr · 13 Jul 2017 at 19:34

ZXSpectrum said:
Max temps 86 degrees less with AVX workloads (expected as it's running at 4.2ghz) maybe it's a great batch. Maybe not... great performance as well with 2460 Pts in cinebench.

Well i have no 1st hand experience with the platform so can't really argue, though to me 86 degrees seems on toasty side but hey. Though i still think they should have put solder on a £1000 chip. Will be interesting to see if they maintain same policy going forward.

ZXSpectrum · 13 Jul 2017 at 19:42

That's 86 degrees max on 1 core peak temp. It generally runs at about 75-80 degrees under load.

Burr · 13 Jul 2017 at 20:04

Ahh but how much cooler would it have been if Intel hadn't skimped out and soldered it? And for me 86 peak is still too high... That's just me i guess.

8 Pack · 13 Jul 2017 at 22:05

Intel increased tj max on these chips 86c is fine. Not sure about why anyone would care about 86 it's fine.

Burr · 13 Jul 2017 at 22:12

Fair dues.

Gerard · 13 Jul 2017 at 22:23

Christ, well that was interesting. The actual delid itself was easy but led to other shenanigans.

Anyway, reinstalled the cpu and powered on, board goes on and off in a loop, end up taking the cpu out and notice a fractionally misaligned pin on the mobo socket. Ended up using my phone camera to zoom in on it and poke it back into place with a pair of tweezers. Before that though i had a stuck sata cable...or what i thought was stuck. Ended up yanking out the actual connector from its pins on the board as i forgot it was a locking cable. Ended up sorting that out as well with the tweezers to line the pins up and it clicked back into place. :rolleyes:

Anyway temps wise it seems to be topping out around 60ish at stock speeds, going to try clocking it up a bit and see what happens.

Burr · 13 Jul 2017 at 22:40

Sounds like you've been having fun

. The 2nd image - initially i wasn't sure what i was looking at, that liquid metal stuff looks mental. So how big an improvement over default paste?

Gerard · 13 Jul 2017 at 22:44

Burr said:
Sounds like you've been having fun . The 2nd image - initially i wasn't sure what i was looking at, that liquid metal stuff looks mental. So how big an improvement over default paste?

Well im running occt now at 4.4ghz maxing at 68c at close to 1.4 volts, would usually be into the 80's by now. My chip isn't the greatest clocker.

Burr · 13 Jul 2017 at 22:49

12+ degree improvement is decent. Heard some folks get as low as 5. Have fun OC'ing!

Gerard · 13 Jul 2017 at 22:50

Gerard · 14 Jul 2017 at 00:02

Burr said:
12+ degree improvement is decent. Heard some folks get as low as 5. Have fun OC'ing!

lol, fun and overclocking are not 2 things i put together, i find it incredibly tedious to be honest. Used to like doing it years back, these days I've not got the patience for it.