Precision 7550 & 7750 Owners' Thread

http://forum.notebookreview.com/threads/precision-7530-precision-7730-owners-thread.820539/page-178

Appears that this PCH issue has been going on forever. It turns out that I also get the same temps as they do... 68-72c under light load.

 

Don't want to spam the thread, but I have a possible project that I would want to embark on to keep the PCH nice and cool

The aluminum thermal shell has quite a lot of thermal mass and would cool the PCH well. I plan on making a thermal bridge directly from the chipset to the bottom case using thermal pads. The only problem is this plastic that is covering it. Removal of the plastic should have minimal effect on anything else (since it serves no structural purpose). The goal is to be able to turn link state power management off and keep the PCH under 80C under heavy load. Sounds ambitious, but I think it's doable. The PCH for mobile is rated at 3W max which should be coolable.

The only thing that's holding me back is that I want to do a neat job of it. I don't have a Dremel but I'd like to make it as neat as possible.

@Ionising_Radiation any suggestions?

 

Personally, I feel like you should leave ACPI link state PM on, regardless of the cooling available to the PCH. ASPM is a bit like Intel SpeedStep for the PCIe lanes, and there would be no real point in keeping unused/idle lanes active unless every last millisecond of latency and ramp-up time is important in your workload.

As for cutting off the plastic to make some space, consider a heat gun to make that area of plastic more malleable, and then perhaps take a normal blade to it, to cut out a clean edge.

 

@SlurpJug : The reviewer in the forum you quoted (51NB) looks to be the same as the one in our thread "Test serial 1 of the DELL Precision 7750: Speed first!" (http://forum.notebookreview.com/threads/test-serial-1-of-the-dell-precision-7750-speed-first.833388/)
@song_1118 : Did you also notice in the Precision 7750 the same issue of @SlurpJug with Temp2 (likely the PCH temp.) by using HWiNFO?
Additionally, would it be possible for you to post a screenshot from HWiNFO about PL1 and PL2 CPU power limits in the 7750?

Thank you very much for your help

 

Agreed. I've used a small Cutco kitchen knife for stuff similar to this before (nice and sharp).

 

My 7750 is still being tested;
Using HWiNFO, PL1 is 75W (56.99sec) and LP2 is 135W (2.44ms). I will post the related screenshots later.

As for "Temp2 (likely the PCH Temp)", I'm not sure yet on the 7750.

 

You can see Temp2 under the Dell EC section of HWiNFO.

It appears that the 105W PL1 limit was just a rumor. A shame that they couldn't enable higher limits for the larger 17 inch chassis.

How is the build quality on the 7750 by the way?



This is real-world use temps after an hour of Witcher 3 without any cooling mods. It's on the mStand and that's it.

I Checked the Intel 400 Series Chipset Platform Controller Hub specifications for thermals and the maximum temperature specified is 110C. However, I have heard that the thermal shutoff trip point is at 127C.

86C isn't great by any means but it's also not the end of the world, thankfully.

 

I can't really tell what is covering it up under that plastic covering up the PCH, it is just a flat copper shim? Maybe the best thing to do would be to remove the plastic, and rather bridging to the exterior case, just install something like this to get it better passive cooling. (Second review mentions a decent improvement in cooling a laptop PCH, after they removed some of the adhesive and applied some thermal paste in its place.)
https://smile.amazon.com/dp/B079FV2RH3

On my PCH I tried first to use a small heatsink on top of the dye, but it didn;t make much of a diference. A couple days later I decided to repaste my CPU, so I also decided to try to make the PCH heat dransfer a bit better. I removed the center portion of the thermal adhesive and used a little bit of Kryonaut in that area, while maintaining the surrounding parts of the adhesive to have a surface to stick it with.

After doing these small mods, my NVMe controller stays around 70-75C and my PCH stays around 70C which which in my opinion, I am very happy about it.

Spoiler

 

Here's a screenshot of one of The Times I used HWiNFO to run SPECviewperf 13 on my 7750,
with DELL EC Temp2 implemented in the range of 46 to 64 degrees Celsius (room temperature is about 30 degrees Celsius).

 

As China is currently the traditional festival of "Dragon Boat Festival" and has a three-day holiday, I am conducting some tests on the 7750 for a long time. I have not tested its quality. It will take me about a week to test its quality.