Question 1

what size would be best for a gtx 1080ti?

Accepted Answer

The die size of the 1080ti is 471 mm², and the square root of that is 21.7cm which would be the height and width if it were a perfectly square die. However, the die shape of the 1080ti is roughly a 5:4 aspect ratio so, at minimum, you'd likely need the 25x25 size pad.

Do keep in mind that there are a bunch of SMDs around the die, so you may want to cover them with something since kryosheet is electrically conductive ("electricians bundling tape" is my current go-to solution as it's like electrical tape but is less permanent and doesn't leave behind any stickiness much like painter's tape).

Also, protip: a single drop of Isopropyl alcohol on the die and then placing the KryoSheet on top of it will help keep the KryoSheet in place when reattaching the CPU heatsink.

Question 2

7840u would fit with the 24x12mm?

Accepted Answer

Indeed it should. In fact, the die-size should be a bit to somewhat smaller even, leaving you with some "overhang" on the KryoSheet.

The die size of the 7840u is 178 mm², and the square root of that is 13.34cm which would be the height and width if it were a perfectly square die. However, the die shape of the 7840u is roughly a 10:7 aspect ratio, meaning the shorter axis should actually be less than the KryoSheet's 12mm width and therefore should fit without issue.

Do keep in mind that there are a few SMDs near the die so, depending on how much "overhang" there is, you may or may not want to cover them with something since KryoSheet is electrically conductive ("electricians bundling tape" is my current go-to solution as it's like electrical tape but is less permanent and doesn't leave behind any stickiness much like painter's tape).

Also, protip: a single drop of Isopropyl alcohol on the die and then placing the KryoSheet on top of it will help keep the KryoSheet in place when reattaching the CPU heatsink.

Question 3

Is this a single use item, or can you reuse it similar to the Thermal Grizzly Carbonaut pad?

Accepted Answer

It is a solid piece of carbon nanotubes, and it can be re-used. I have cut the sheets to size, and scissors did not ruin the material.

Question 4

Would this work with the 4090 fe. Im planning on water cooling my gpu.

Accepted Answer

You should find the size of your GPU silicon die, and buy a sheet of nanotubes which covers the die completely. These come in various sizes up to 50x50 mm I believe.

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Thermal Grizzly KryoSheet Wärmeleitpad - 24 x 12 mm

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