I have a Zotac RTX 5090 Solid OC and replaced the stock GPU thermal interface material with a Thermal Grizzly KryoSheet. While testing in Cyberpunk 2077, the card reached a maximum GPU temperature of 67.1°C, a 73.8°C hotspot, and an impressive 6.7°C core-to-hotspot delta. Memory junction and chip temperature both peaked at 88°C. Power draw was up to 423 W, with the fans reaching roughly 1,740 RPM. Do these results look healthy for a 5090 at this power level? I'm especially wondering whether 88°C memory temperature is normal since I reused the stock VRAM pads or putty. Before the replacement, the hotspot was around 95–96°C and the original thermal paste appeared melted.
2 Answers
The main improvement seems to be the hotspot: dropping from roughly 95–96°C to 73.8°C is a substantial result. Memory temperatures are handled separately from the GPU die, so changing the core interface material usually won’t lower them much. Unless the memory keeps climbing toward its limit, throttles, or shows instability, 88°C at this power draw is generally fine.
Those temperatures look very good for a 400–423 W RTX 5090. A 67°C core temperature and only a 6.7°C hotspot difference suggest the KryoSheet is making excellent contact. An 88°C memory junction temperature is also within a normal range under a heavy gaming load, especially with the original VRAM pads or putty still installed. There’s no obvious thermal problem here.
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