B00ze wrote:
Good day.
So I've overclocked my 6700K to 4.5GHz; this required 1.3V base and with
LLC=6 it goes up to 1.360V in extreme situations, and this is where I am
wondering if I screwed-up the heat-sink/termal-paste somehow. What temps
are you guys seeing when you run Prime95's Small FFT (Maximum Heat) on
your overclocked CPU? Because on mine that particular test can make the
temps climb all the way to 93C. The heat-sink is a really good one
(NOCTUA NH-U12S) but it doesn't even get hot to the touch, it is barely
warmer than room temp, and I used good Arctic Silver TIM. While I may
have placed a tiny tiny bit too much I was real careful with the stuff
(maybe I didn't put enough?) Under normal testing I have good temps, but
under that extreme Small FFT Prime95 test, my CPU really cooks - do you
all get the same temps on air?
Thank you.
Best Regards,
That heatsink seems to give pretty good performance here,
in terms of the degreesC/W.
http://www.frostytech.com/articlevie...id=2749&page=5
If the internal case air is at 35C, the Noctua added 20C (to get to Tcase),
you added another 25C case to junction (unknown, guess), the
Tjunction should be around 80C. Check and make sure the
computer case has a big enough fan on the back (to keep it at 35C).
If you notice that the CPU temp *drops* when you take
the side off the PC, that means your case cooling
sucks :-)
My case cooling isn't the greatest (since I fitted a
quieter fan on the back). I'm using the GPU as a proxy
for case air temp here. The hard drive is in the front of
the computer and hasn't budged. You can see the GPU temp
coming up a tiny bit, so I'd have to leave it running
for a bit longer, to get a true final temp. You can see
I could push this thing harder, but I'd have to fix
VCore somehow (too hot).
https://s28.postimg.org/ve04pgfl9/prime95_test.gif
That's cooled by a Noctua NH-D15 (with the center fan fitted).
I de-tuned the PC a bit when I got it, as the default
Asus settings were cooking the Vcore regulator. I turned
off the Turbo (which wouldn't make any difference in this
case, as it cannot Turbo if all cores are 100%). The measured
power, using a clamp-on ammeter, was 156W, before I turned
down the setting. That's the power feeding into VCore (ATX12V).
I have no easy way to measure the current flowing on VCore
itself. My clamp-on ammeter cannot fit around the copper
plane :-)
So my conditions aren't even close to a match for yours.
My Vcore heatsink was running 65C with the original settings
(with Prime95 as the test), so I couldn't leave the
thing that way. It probably won't go into thermal
runaway, but I'm not taking a chance. If only I'd
remembered to check the size of the VCore heatsink
before I bought the motherboard :-( Mistake.
Take a picture and show the dynamics of your setup,
from "idle" to running the test for 7-8 minutes. Just
to give some idea what hops up first.
https://postimage.io/index.php?um=flash
Things that matter:
1) Bent CPU.
2) Condition of the Intel TIM, between the silicon die
and the lid. Intel used low-temperatore solder between
the CPU and lid in the LGA775 days. To avoid "conflict
minerals", they went back to conventional dough-like material
on the newer processors.
3) It would take a generous, gushing layer of AS5 to insulate.
On the "too lean" side, you should use an inspection mirror from
the side, and look for the color of the AS5 wetting the junction.
Depending on the size of the heatsink, it might not be possible
to eyeball it. I apply half a rice grain bit of AS, compress, verify
the spread diameter, then adjust the dose for the second and final
installation. Then, hold the inspection mirror around the side,
and look for a wetted junction. Mine don't generally gush all
over as a result. I've under-dosed at least once, and then
it was third-time-lucky.
I stopped spreading it with a credit card, a long time ago :-)
That's just a waste.
Paul