Compare · prices checked 2026-09-03
RTX 5080 vs RTX 4090: specs, price per hour, which to rent
NVIDIA RTX 5080 (16 GB, $0.140/hr) against NVIDIA RTX 4090 (24 GB, $0.262/hr): public specs side by side, live fixed prices from our sheet, what fits in each card's VRAM, and a verdict written for real workloads — both are rentable right now.
RTX 5080 vs RTX 4090 specifications
Public NVIDIA figures (dense, non-sparsity). The last column is RTX 5080 relative to RTX 4090.
| Spec | RTX 5080 | RTX 4090 | Difference |
|---|---|---|---|
| Architecture | Blackwell (2025) | Ada Lovelace (2022) | — |
| VRAM | 16 GB GDDR7 | 24 GB GDDR6X | −33% |
| Memory bandwidth | 960 GB/s | 1,008 GB/s | −5% |
| FP16 tensor (dense) | 225 TFLOPS | 330 TFLOPS | −32% |
| FP32 | 56.3 TFLOPS | 82.6 TFLOPS | −32% |
| CUDA cores | 10,752 | 16,384 | −34% |
| TDP | 360 W | 450 W | −20% |
| PCIe · NVLink | Gen 5.0 · no NVLink | Gen 4.0 · no NVLink | — |
| PowerScore (RTX 3090 = 100) | 158 | 232 | −32% |
| Max GPUs per machine | 8× | 8× | — |
RTX 5080 vs RTX 4090 price per hour
Fixed rates from our sheet — every on-demand price is the marketplace median × 0.70, rounded down. Monthly = 730 hours.
| Rate | RTX 5080 | RTX 4090 | Cheaper |
|---|---|---|---|
| On-demand, per GPU-hour | $0.140 | $0.262 | RTX 5080 (−47%) |
| Interruptible, per GPU-hour | $0.070 | $0.131 | RTX 5080 |
| Reserved (3 mo), per GPU-hour | $0.091 | $0.170 | RTX 5080 |
| On-demand, per month | $102 | $191 | RTX 5080 |
| Market median (reference) | $0.20 | $0.37 | — |
| $ per 1,000 FP16 TFLOP-hours | $0.62 | $0.79 | RTX 5080 (better value) |
| $ per GB of VRAM per hour | $0.0088 | $0.0109 | RTX 5080 (better value) |
Try a full month with storage and bandwidth in the GPU cost calculator.
What fits in VRAM: 16 GB vs 24 GB
| Workload | RTX 5080 | RTX 4090 |
|---|---|---|
| Largest LLM in FP16, one card | ~3B | ~8B |
| Largest LLM at 4-bit, one card | ~24B | ~32B |
| Flux dev (FP8, ~17 GB) | tight | fits |
| Wan 2.x 14B video (offloaded) | no | yes |
| 70B 4-bit LLM on one card | no | no |
Rules of thumb: ~2.4 GB per billion parameters in FP16 all-in, ~0.62 GB in 4-bit. Full tables in the VRAM guide.
Verdict: which should you rent?
The RTX 5080 has 16 GB GDDR7 and FP4 tensor cores; the RTX 4090 has 24 GB GDDR6X and more CUDA cores. The 4090's extra 8 GB decides most AI jobs; the 5080 is the cheaper pick for workloads that fit in 16 GB.
- Cheaper per hour: RTX 5080 ($0.140 vs $0.262, −47%).
- More VRAM: RTX 4090 (24 GB vs 16 GB).
- More FP16 throughput: RTX 4090 (about 1.5×).
- Best value per TFLOP-hour: RTX 5080.
- Best value per GB of VRAM: RTX 5080.
- Multi-GPU: RTX 5080 over PCIe · RTX 4090 over PCIe.
Related comparisons
RTX 5080 vs RTX 4090: FAQ
Deeper reading: H100 vs H200 vs B200, RTX 4090 vs RTX 5090, how cloud GPU pricing works.
Is the RTX 4090 faster than the RTX 5080?
On dense FP16 tensor throughput the RTX 4090 leads by about 1.5× (330 vs 225 TFLOPS). Memory bandwidth matters as much for inference: RTX 5080 960 GB/s vs RTX 4090 1,008 GB/s.
Which is cheaper to rent, the RTX 5080 or the RTX 4090?
The RTX 5080: $0.140/hr on-demand versus $0.262/hr — 47% less. Interruptible rates are $0.070 (RTX 5080) and $0.131 (RTX 4090). Per TFLOP-hour the better value is the RTX 5080.
Which has more VRAM and what does that change?
The RTX 4090 has 24 GB versus 16 GB. In LLM terms that is roughly a 8B FP16 model (or ~32B in 4-bit) on one card against 3B FP16 (~24B 4-bit). If the model does not fit, speed is irrelevant.
Can I rent both on PowerGPU right now?
Yes — 142 × RTX 5080 and 439 × RTX 4090 are online as this page renders, deployable in about 30 seconds, billed per second, paid in crypto with no KYC.