RTX 5080 vs RTX 5090: Which Should You Buy?
Head-to-head on performance, VRAM, power and value for 2026.
Quick Summary · TL;DR
On our relative performance index the RTX 5090 leads the RTX 5080 by about 16% — a moderate gap. The RTX 5090 has more VRAM (32GB vs 16GB), which helps at high resolutions and in VRAM-hungry titles.
| RTX 5080 | RTX 5090 | |
|---|---|---|
| Performance index | 86/100 | 100/100 |
| VRAM | 16GB | 32GB |
| Board power (TBP) | 360W | 575W |
| Maker PSU guidance | 850W | 1000W |
| Our starting PSU class | 850W | 1000W |
| Power connector | 16-pin 12V-2x6 | 16-pin 12V-2x6 |
| Generation | RTX 50 | RTX 50 |
Relative gaming index — an estimate of typical performance. Real-world gaps vary by game, resolution and settings.
Which should you buy?
Buy the RTX 5090 if you want the higher frame rate and can find it at a fair price. Choose the RTX 5080 if it is clearly cheaper and its 16GB+ of VRAM and features cover your target resolution. Both are from a similar lineage, so price is the main deciding factor.
Power planning: RTX 5080 PSU · RTX 5090 PSU.
RTX 5080 vs RTX 5090 at each resolution
| Resolution | RTX 5080 | RTX 5090 |
|---|---|---|
| 1080p | Excellent | Excellent |
| 1440p | Excellent | Excellent |
| 4K | Excellent | Excellent |
On our rating lines the RTX 5080 (86) and RTX 5090 (100) land on the same verdict at every resolution, so the 14-point index gap does not move either card into a different class. Memory, power and the price you can find decide it. The RTX 5090 also carries 16GB more memory (32GB vs 16GB).
Power, PSU and efficiency
Reference board power is 360W for the RTX 5080 and 575W for the RTX 5090, a 215W difference. Per 100W that works out to 23.9 index points for the RTX 5080 and 17.4 for the RTX 5090, so the RTX 5080 does more per watt. An existing 850W supply meets the maker guidance for the RTX 5080 but not for the RTX 5090 (1000W). Full sizing: RTX 5080 PSU · RTX 5090 PSU.
Ratings use the same index lines as our GPU resolution pages; the index is an editorial tier summary, not a benchmark. PSU figures are the makers’ reference guidance reviewed 12 September 2026.
Sources & verification
Relative indices summarize broad gaming tiers and are not a substitute for game-by-game benchmark averages. Price and driver updates can change the buying recommendation. Last reviewed September 19, 2026.
Frequently asked questions
Is the RTX 5080 better than the RTX 5090?
On our relative index the RTX 5090 is about 16% ahead of the RTX 5080. The RTX 5090 has more VRAM (32GB vs 16GB), which helps at high resolutions and in VRAM-hungry titles. The smaller the gap, the more other factors like price, VRAM and features should decide it.
Which is better value, the RTX 5080 or the RTX 5090?
Value depends on the price you can find each at. The slower card is usually the smart buy if it is meaningfully cheaper, unless you need the extra VRAM or features of the faster one.
Do the RTX 5080 and RTX 5090 need different power supplies?
The RTX 5080's maker lists a 850W supply and the RTX 5090's lists 1000W; our starting classes are 850W and 1000W. If you might move to the RTX 5090 later, size for its 1000W now. The RTX 5080 and RTX 5090 can also take a PCIe Gen 5 (12V-2x6) cable; see the connector guide.
Make sure your CPU can keep up with either card using the Bottleneck Estimator, or compare more cards in the GPU comparison hub.