Alienware 17R4 bizarre GPU/CPU temps

Hi guys, I've recently repasted my A17 R4 (7820HK - GTX 1080) as temps were absolutely horrible. I re-pasted last weekend and I'm trying to find out if I've messed it up and need to redo or did (relatively) well. Basically, I can't find much info about AW17R4 temps after non-LM re-paste, has anyone with 7820hk / gtx 1080 done a re-paste with traditional paste and what temps do you get under load? Say, an hour of Witcher 3 or something?

I've re-pasted (Thank G. for iunlock's awesome, awesome guide, dude you're the man!) with Thermal Grizzly Kryonaut, replaced the termal pads with Gelid solutions GP Extreme 12 W/mk (as the Fujipoly are awefully expensive round here) and did iunlock's PCH mod

- The system is not overclocked
- CPU is undervolted neg. 0.120
- The lappy is placed on a cooling pad
- When not gaming, the temps are mid 40Cs CPU and mid 40Cs for GPU
- Under load (gaming), both CPU and GPU temps rise relatively rapidly to mid 60s on cool days (ambient room temp 15-20C) and up to 70C on warm days (room temp 20-25C)
- CPU core temp differential appears moderate, 4-8C between hottest and coolest core

Moreover, there are two things that I find very strange.

First CPU and GPU temp appear to move in lockstep and, what is even more bizarre, the GPU and CPU temps are always within 2-3C from each other (basically, CPU temp is a linear +3C of the GPU)

- CPU under-volting seems to have no measurable effect on CPU temp, all being equal there is no significant difference between average temps under load - I can under-volt up to neg 0.14 safely, the average temp under load is the same as the average without under-volt, which makes no sense at all...

 

Shared heatpipes explain why both GPU and CPU temps are related.

 

Agreed, but to an extent where we have nearly perfect correlation? Also, why would undervolting appear to have no effect on CPU temps at all?

 

How do you undervolt?
If you are using Throttlestop instead of XTU, then you have to adjust the CPU cache as well - XTU will move the CPU cache's slider whenever you are moving the CPU core's slider (and vice-versa).
In case you are only undervolting the CPU core without undervolting the cache then the CPU will discard that undervolt ;-)

 

I'm using XTU, the offset for both the core and cache is -120

 

Hmmm, have you checked using HWInfo whether it actually registers a difference in VID? (e.g. "Core #0 VID")

 

That's a very good shout, makes sense to see what the VID and vcore values are, I'll check after work today, I'm using HWInfo, but only looking at the GPU and CPU temps (and the cpu core temps for the spread)

 

My temps look almost identical to what your seeing. mid 60's while gaming, depending on the game, Running ARK for hours on end I see 65-68 usually on the CPU and 63-66 on the GPU.

No OC
Cooling pad ( U3 )
-.100 UV.

 

Disable XTU and use ThrottleStop instead. Also, consider lifting the back of the laptop to get adequate fresh air to get better reduction in temps.