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RTX 4090 vs RTX 5090
Cloud rental price, compute per dollar and specs, side by side.
Open in the interactive comparer →
RTX 4090$0.29lowest on-demand per GPU·h
$1.78 per PFLOP·h · 6 providersRTX 5090$0.40lowest on-demand per GPU·h
$1.91 per PFLOP·h · 6 providersWhat actually differs
- The RTX 5090 has 1.3× more dense FP16/BF16 throughput than the RTX 4090 (0.165 PF vs 0.209 PF).
- The RTX 5090 has 1.8× more memory bandwidth than the RTX 4090 (1,008 vs 1,792 GB/s), which usually limits LLM token generation. Memory: 24 GB vs 32 GB.
- Only the RTX 5090 supports FP4.
- The RTX 4090 is 27% cheaper per hour than the RTX 5090 at the lowest on-demand prices ($0.29 vs $0.40).
- Per unit of compute, the RTX 4090 is the better deal: $1.78 vs $1.91 per PFLOP-hour of dense FP16/BF16.
| Spec / price | RTX 4090 | RTX 5090 |
|---|---|---|
| Memory | 24 GB GDDR6X | 32 GB GDDR7better |
| Memory bandwidth | 1,008 GB/s | 1,792 GB/sbetter |
| FP16 / BF16 (dense) | 0.165 PF | 0.209 PFbetter |
| FP8 (dense) | 0.33 PF | 0.419 PFbetter |
| FP4 (dense) | — | 1.68 PF |
| INT8 (dense) | 0.661 PF | 0.838 PFbetter |
| TF32 (dense) | 0.0826 PF | 0.105 PFbetter |
| FP32 (dense) | 0.0826 PF | 0.105 PFbetter |
| FP64 (dense) | 0.0013 PF | 0.0016 PFbetter |
| Power | 450 W | 575 W |
| Architecture | Ada Lovelace (2022) | Blackwell (2025) |
| Lowest on-demand | $0.29better | $0.40 |
| Median on-demand | $0.39better | $0.65 |
| Lowest spot | $0.16better | $0.24 |
| FP16/BF16 $ per PFLOP·h | $1.78better | $1.91 |
| Providers | 6 | 6 |
RTX 4090 vs RTX 5090: questions
Is the RTX 4090 faster than the RTX 5090?
The RTX 5090 has 1.3× more dense FP16/BF16 compute than the RTX 4090. The RTX 5090 has 1.8× more memory bandwidth than the RTX 4090. Real-world speedups depend on the workload: training and prefill scale with compute, while LLM decoding scales mostly with memory bandwidth.
Which is cheaper per FLOP, the RTX 4090 or the RTX 5090?
Right now the RTX 4090 is cheaper per unit of compute: $1.78 vs $1.91 per PFLOP-hour at the lowest on-demand prices.
How much does it cost to rent an RTX 4090 vs an RTX 5090 for a month?
Running one GPU around the clock at the lowest on-demand price costs about $215 per month for the RTX 4090 and $293 for the RTX 5090.
Which has more memory, the RTX 4090 or the RTX 5090?
The RTX 5090 has more memory: 32 GB vs 24 GB.