NVIDIA’s RTX 5090 is the new Blackwell flagship, and the RTX 4090 is the Ada Lovelace champion it replaces. On paper the 5090 brings 32GB of GDDR7, 78% more memory bandwidth and DLSS 4 Multi Frame Generation, but the 4090 remains one of the fastest GPUs ever made.
This guide breaks down the real-world differences in 4K gaming, ray tracing, AI and creator workloads, power draw and value, so you can decide whether the jump to Blackwell is worth it for your build.
Key differences at a glance
- SpecRTX 5090RTX 4090Architecture: RTX 5090, Blackwell; RTX 4090, Ada Lovelace
- CUDA cores: RTX 5090, 21,760; RTX 4090, 16,384
- Memory: RTX 5090, 32GB GDDR7; RTX 4090, 24GB GDDR6X
- Bandwidth: RTX 5090, 1,792 GB/s; RTX 4090, 1,008 GB/s
- FP32 (TFLOPS): RTX 5090, 104.8; RTX 4090, 82.6
- TDP: RTX 5090, 575W; RTX 4090, 450W
- Launch MSRP: RTX 5090, $1,999; RTX 4090, $1,599
Specifications at a glance
| Spec | RTX 5090 | RTX 4090 |
|---|---|---|
| Architecture | Blackwell | Ada Lovelace |
| CUDA cores | 21,760 | 16,384 |
| Memory | 32GB GDDR7 | 24GB GDDR6X |
| Bandwidth | 1,792 GB/s | 1,008 GB/s |
| FP32 (TFLOPS) | 104.8 | 82.6 |
| TDP | 575W | 450W |
| Launch MSRP | $1,999 | $1,599 |
Gaming performance
At native 4K the RTX 5090 is roughly 25-45% faster than the RTX 4090, and the gap widens to 30-55% in heavy ray tracing. DLSS 4 Multi Frame Generation is exclusive to the 50 series and can multiply frame rates further in supported titles.
AI & creator workloads
The bigger story is memory. With 32GB of GDDR7 and 78% more bandwidth, the 5090 pulls ahead 50-80% in AI and creative tasks. On Llama 70B inference it reaches roughly 85 tokens/sec versus about 52 on the 4090 - a 63% uplift - and native FP4 helps quantized models.
Power & value
The 5090 draws 575W and needs a strong PSU and case airflow. A used 4090 still delivers about 75% of the 5090’s 4K performance for a lower outlay, which keeps it relevant for gamers whose work fits in 24GB.
Verdict: which should you buy?
Buy the RTX 5090 if you want the fastest consumer GPU, need 32GB for local AI or 8K/heavy creator work, or value DLSS 4 MFG. If your games and projects fit in 24GB and you already own a 4090, the upgrade is hard to justify on gaming alone.
Total cost, availability and support
Raw benchmarks are only half the story. Street prices, stock levels and lead times for RTX 5090 and RTX 4090 swing widely with demand and region, and warranty and after-sales support differ from one seller to the next. On GPU Vendors you can compare verified vendors side by side, see transparent pricing and lead times, and buy direct, which often matters more to total cost of ownership than a few percentage points of raw performance.
Which one is right for you?
If your workloads and budget are still growing, favour the option with more memory and longer headroom so you are not forced to upgrade again within a year. If you have a fixed, well-understood workload, the more affordable choice frequently delivers the best value per dollar. Model both against your real requirements, resolution and frame-rate targets for gaming, or model size, batch size and context length for AI, before you commit.
Frequently asked questions
Is RTX 5090 worth it over RTX 4090?
It depends on your workload and budget. If you regularly hit the limits of RTX 4090, whether that is memory capacity, bandwidth or raw throughput, then RTX 5090 pays for itself in headroom and longevity. If RTX 4090 already covers your needs comfortably, the upgrade is harder to justify on performance alone.
Will RTX 4090 still be supported?
Yes. Both options continue to receive driver and software support, so RTX 4090 remains a viable choice and is often the better value on the used and clearance market.
Where can I compare prices for RTX 5090 and RTX 4090?
Use the GPU Vendors comparison tool to line up full specs and live prices from verified sellers, then buy direct from the vendor with the best price and lead time.
Prices and availability change constantly. Compare live offers from verified sellers and build a side-by-side spec sheet on the GPU Vendors comparison tool.