Inaccurate GPU temps after waterblock install

jamiltsaleh · Jul 1, 2018

I just installed an alphacool GPX pro 240mm AIO liquid cooler on my (rare-ish) zotac 1080 ti mini (Because it gets HOT on air). The temps in MSI AB (on air) used to be at least what *seemed* like accurate (around 30 at idle, 85 at load). After installing the block, the GPU reads at 18 degrees at idle, and 25 at load. My pc is in a pretty chilly basement, but ambient is 18 degrees so idling at 18 should be normal-ish. I found a laser thermometer and the backplate temps of the card were in the mid forties at load. That would mean that the GPU must be warmer, right? I also know from seeing full custom loops that 25 degrees on a watercooled 1080 ti is just too good to be true; the people that went custom usually got 45 degrees or so at load. This is an AIO, not an LN2 loop made by god himself.

Question: Why might MSI afterburner be showing me these weird temps? The load temps just don't make sense. Is it possible that I damaged some temp sensor while installing the block?

Barty1884 · Jul 5, 2018

It depends where the sensors are etc.

MSI AB monitors the GPU die temp only (AFAIK). Components like the Power delivery and memory on the card will also produce heat - which would be reflected in the backplate temps, but not in the temp recorded by AB.

As for the results as a whole, the 240mm RAd will probably help some -- typically a 120mm rad is sufficient (that's why the hybrid cards ship with them).

25'C definitely seems low though. Have temps leveled out at that point? AIOs take time to reach a consistent temp due to the properties of the fluid.

jamiltsaleh · Jul 5, 2018

thanks for the reply!

I was also reasonably certain that AB was monitoring the GPU die temps, which does make more sense. It's good to have someone confirm it. I learned over the past week from other threads that the VRM and power delivery modules will generate a decent amount of heat as well, hence the need for thermal pads and whatnot. Temps have settled between 30 to 35 degrees Celsius now, which seems a fair bit more reasonable. Good point in that the fluid in the AIO isn't *just* water and might not display the same properties initially; everything is rock solid stable when gaming/benching, and it all seems copacetic.

I actually had the choice of a 120mm or 240mm, and since there was only a three dollar difference at the time of buying it, I went for the larger one. In any case, everything seems to be normalizing, and I very much appreciate the info for a first-time liquid cooling noob such as myself.

All the best, and thanks again!

One last question tho, how do i mark a thread as solved or closed, etc.?

Barty1884 · Jul 5, 2018

Even if it were *just* water, by the nature of it, it will take time to normalize.
Air coolers will pretty much shoot up to their max temp instantly, liquid takes time (15-30mins is usually a safe bet, to be sure).

30-35'C still seems a bit on the low side, but a 240mm rad might be the reason there.

What kind of ambient temp do you have? It's impossible to see sub-ambient idle temps without exoit (or weird) cooling methods because ambient is the air flowing across the rad and/or idle isn't strictly always going to be 0% load, it's just minimal load.

Selecting the best answer, as you have done, is sufficient to mark as "solved".

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Inaccurate GPU temps after waterblock install

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