will this work on intell LGA1700 chips

Yes, I am typing this response on a computer where a 38mm x 38mm Kryosheet is installed. I even had to reinstall the cooler with no harm to the sheet or change in cooling. Processor, i7-13700KF. Cooler iQue H170i Elite.

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.

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Thermal Grizzly KryoSheet (38x38x0.2mm) – Ultra High Thermal Conductivity Graphene Thermal Pad – Perfect Alternative for Thermal Paste on CPU/GPU/PS4/PS5/Xbox – Made in Sweden

Thermal Grizzly KryoSheet (38x38x0.2mm) – Ultra High Thermal Conductivity Graphene Thermal Pad – Perfect Alternative for Thermal Paste on CPU/GPU/PS4/PS5/Xbox – Made in Sweden

Product ID: 536059494

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🔥12 W/mK ultra thermal conductivity

🛠️0.2mm precision thickness

🇸🇪Premium Swedish engineering

Description

❄️ Stay cool, perform cooler — the future of thermal management is here!

BUILT TO LAST - Engineered for extreme durability, ensuring consistent performance over time
EFFORTLESS INSTALLATION - Thin 0.2mm pad applies smoothly—ditch messy thermal paste forever
VERSATILE COMPATIBILITY - Perfect fit for CPUs, GPUs, PS4, PS5, Xbox—one pad to rule them all
NEXT LEVEL COOLING EFFICIENCY - Ultra-high 12 W/mK thermal conductivity keeps your CPU/GPU chill under pressure
SWEDISH PRECISION CRAFTSMANSHIP - Made in Sweden with cutting-edge graphene tech for elite heat dissipation

Thermal Grizzly KryoSheet is a 38x38x0.2mm ultra-high thermal conductivity graphene pad designed as a superior alternative to thermal paste. Engineered in Sweden, it delivers consistent, efficient heat dissipation for CPUs, GPUs, and gaming consoles like PS4, PS5, and Xbox, combining precision thickness with extreme durability for professional-grade cooling performance.