what size would be best for a gtx 1080ti?

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.

7840u would fit with the 24x12mm?

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.

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

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.

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

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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❄️ Stay cool, game on—thermal mastery in a sleek graphene sheet!

EFFORTLESS APPLICATION - Skip the mess of thermal paste with a clean, easy-to-install pad that delivers reliable cooling performance every time.
VERSATILE COMPATIBILITY - Perfect alternative for CPUs, GPUs, PS4, PS5, and Xbox—upgrade your gaming rig or workstation with confidence.
PRECISION CUT GRAPHENE PAD - Ultra-thin 0.2mm sheet ensures perfect fit and maximum surface contact for superior heat dissipation.
SWEDISH ENGINEERING QUALITY - Crafted with precision in Sweden, guaranteeing consistent performance and durability for demanding tech environments.
ELECTRICALLY CONDUCTIVE EXCELLENCE - Designed for optimal thermal conductivity—handle with care to protect your high-end CPU/GPU setups.

Thermal Grizzly KryoSheet is a premium 24x12x0.2mm graphene thermal pad engineered in Sweden, offering ultra-high thermal conductivity as a clean, efficient alternative to traditional thermal paste. Its electrically conductive design ensures superior heat transfer for CPUs, GPUs, and gaming consoles like PS4, PS5, and Xbox, delivering consistent cooling performance with easy application.

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Brand	Thermal Grizzly
Product Dimensions	2.39 x 1.19 x 0.18 cm; 20 g
Item model number	TG-KS-24-12
Manufacturer	Thermal Grizzly
Colour	Black
Are Batteries Included	No
Item Weight	20 g
Guaranteed software updates until	unknown

Thermal Grizzly KryoSheet 24x12x0.2mm – Ultra High Thermal Conductivity Graphene Thermal Pad – Perfect Alternative for Thermal Paste on CPU/GPU/PS4/PS5/Xbox – Made in Sweden

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