01-29-2019 09:39 AM
Repaste definitely can help with the thermals (and so can undervolting), but unfortunately there's no way to get this machine to run under 80 C so the thermal throttling wouldn't affect performance at all.
I tried the dGPU trick and as happy as I am to report it didn't brick my laptop this time (previously tried on 1.15 and had quite a different experience), it unfortunately didn't affect my Cinebench scores at all. I'm getting around 1200 without the virtualization and the best with virtualization on has been ~980. So a far cry from what it should be
Lenovo's response in my case was to ask me to install Lenovo Vantage and turn off intelligent cooling. As anyone could imagine, it didn't help at all.
02-18-2019 07:12 AM
I've managed to figure out it's actually Hyper-V and not the Intel Virtualization technology. Having virtualization enabled in BIOS just happens to be a prerequisite for running Hyper-V, so if that's disabled, the problem disappears, because Hyper-V won't work anymore. Once you turn virtualization on, Hyper-V starts working again and the throttling issue also returns.
02-18-2019 12:14 PM
I've found that a repaste helps for a while, but tends to degrade over time. I used some of the top rated thermal paste in my Yoga 720 and did lots of tests. Temps were much better immediately after the repaste, but a couple months later, the benefits had mostly disappeared. If I want to play a demanding game, I underclock the CPU to 2.2GHz. I have tried under-volting but it did not help, even when pushing it pretty hard like -0.125v. When I had fresh repaste, I didn't have to underclock, though I did have to disable turboboost.
Basically, these 4lb 0.75" thick laptops can not sufficiently cool off a 45W CPU and 50W+ GPU. I wish they could use better heat pipes (vapor anyone) and fans that can push a lot more air (noisily, if need be).
We're ordering a handful of Thinkpad X1 Extremes soon. We're going to be getting the lower-end i7-8750H because running 6 cores at 2.2GHz probably still generates too much heat and it will throttle down, so why even bother with 2.6GHz or the P1 with Xeon @ 2.7GHz (besides more cache)? We're even contemplating the i5, but the i7 model is only $165 more and comes with double the RAM and storage.
02-18-2019 10:40 PM
I know you mean well with your suggestion, but before posting please consider that you are not offering any solution to the root problem here. In my case I am sure Lenovo read this and that is why they send me a fan. This is not a cooling issue this is an issue with some software or bios from Lenovo. I think your tips are very wellcome with a general topic how to improve overall performance, but in this case it is the wrong thread.
02-18-2019 11:56 PM
New update from Lenovo.
According to support there is a intel specification that dictates that when Hyper-v enabled then the machine needs to be throttled at 80 degrees.
Can this be the case?
02-19-2019 12:07 AM
Wow. I asked Intel on Twitter. Here's the thread: https://twitter.com/nylemi/status/1097767915368124416
I'm just super skeptical, because I've been trying to Google if there's similar behaviour with other laptops as well and haven't find any mentions of similar issues on other laptops.
It wouldn't hurt if you and others also posted the question to Intel through Twitter to make it slightly more likely to get answered.
02-19-2019 11:35 AM
I think we will not be able to get anywhere. Intel refused to comment and referred to the vendor.
The only chance is to proof that a P52 doesn’t have the issue. I posted a message on the P/W board.
02-19-2019 09:58 PM
Yeah, Intel instructed me to contact Lenovo too. I insisted that Intel answer the question though and now they said 'we are currently working on your query and we will get back to you once we have an update.' So maybe we shouldn't completely give up on that yet. @IntelSupport was the right user to contact btw.
In the meantime, I found that using a laptop cooling stand gives some remedy to the issue. I bought Coolermaster Ergostand 3 and with the laptop on it, with the fan on the stand set to highest setting (it's still almost inaudible), I can sometimes get 1100 in Cinebench even with Hyper-V. But that's not consistent - I think 1050 is the average of the runs I've done with that stand.
02-20-2019 05:48 AM
Just did a test with my Carbon X1 i7-8550U. This machine does not have the issue. I get temperatures > 90 when Hyper-v is enabled.
Using CPU-Z benchmark and comparing the X1 carbon with the X1 extreme, both Hyper-V enabled the single thread performance is same as X1 extreme and with multi thread the X1 Extreme is about 10% faster.
How ridiculous is this?