Head to head · updated 2026-09-10

RTX4090 vs RTX5090: price and deliverability

RTX5090 currently rents at 0.7× the median price of RTX4090 ($0.40 vs $0.56 per GPU-hour on demand). Whether that premium is worth it depends on memory, fabric, and what you are actually running — not the sticker.

Memory is the first gate: RTX5090 carries 32 GB per GPU vs 24 GB. If your model + KV cache does not fit, price is irrelevant — the smaller card is not a substitute at any discount (ASSAY-1 §5).

Same-name capacity is not one good: within each column, prices spread by multiples depending on fabric. Check the per-GPU pages for every listing with its published interconnect, and the substitutability rules for when one can genuinely replace the other.