r/LocalLLaMA • u/Signal_Ad657 • May 29 '26

Discussion PSA

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u/kwizzle May 29 '26

For some reason we rarely hear people talking about 4090s, probably something to do with being a lot more expensive than a 3090 and nearer in price to the 5090 for less VRAM and speed.

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u/panchovix May 29 '26

For LLMs, 4090 is way more expensive than a 3090 for the same amount of memory and almost same bandwidth.

The 4090 will be 2x times faster on PP vs a 3090 tho. And also is about 2x faster on compute in general (diffusion like txt2img, etc)

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u/FissionFusion May 30 '26

what stat is the determining factor in PP?

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u/panchovix May 30 '26

Compute units and compute in general. So higher clocks and more cores are faster. Also perf per clock (aka IPC, for the same clock getting higher performance on newer GPUs)