Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | AMD - Radeon RX 7700 XT | AMD - Radeon RX 7900 XT |
|---|---|---|
| TDP | 245 W | 315 W |
| VRAM | 12 GB | 20 GB |
| Memory bus | 192 bit | 320 bit |
| CUDA / Stream cores | 3456 | 5376 |
| Ray tracing cores | 54 | 84 |
| 3DMark Time Spy | 14800 | 18800 |
Between the Radeon RX 7700 XT and Radeon RX 7900 XT, the Radeon RX 7700 XT comes out ahead in tdp / boost clock, while the Radeon RX 7900 XT wins on vram / memory bus. Overall, the Radeon RX 7700 XT scores 61.6 and the Radeon RX 7900 XT scores 67.2 on our Mars Score.
Which should you buy?
The Radeon RX 7900 XT edges ahead on the Mars Score (61.6 vs 67.2), but the 5.6-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Radeon RX 7700 XT if you care most about tdp / boost clock. The biggest gaps in its favor are tdp, boost clock. The single most decisive one: TDP — 70.00 W less. 245 vs 315.
Pick the Radeon RX 7900 XT if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. Its strongest claims are vram, memory bus, cuda / stream cores, among others. The single most decisive one: VRAM — 66.67% more. 20 GB vs 12 GB.
Both ship with comparable dlss, so those specs do not separate the two — focus on the differences below.
Bottom line: the Radeon RX 7900 XT is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: AMD - Radeon RX 7700 XT or AMD - Radeon RX 7900 XT?
AMD - Radeon RX 7900 XT leads the current Mars Score by 5.6 points.The more useful decision is the trade-off behind that result: compare vram, cuda / stream cores, boost clock, tdp against the way you will actually use the product.
Choose AMD - Radeon RX 7700 XT if…
AMD - Radeon RX 7700 XT has the measurable edge on tdp w, boost clock mhz.
Choose AMD - Radeon RX 7900 XT if…
AMD - Radeon RX 7900 XT has the measurable edge on vram gb, memory bus bit, cuda cores.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why AMD - Radeon RX 7700 XT wins
- ▲TDP — 70.00 W less. 245 vs 315.
- ▲Boost clock — 6.00% more. 2544 MHz vs 2400 MHz.
Why AMD - Radeon RX 7900 XT wins
- ▲VRAM — 66.67% more. 20 GB vs 12 GB.
- ▲Memory bus — 66.67% more. 320 bit vs 192 bit.
- ▲CUDA / Stream cores — 55.56% more. 5376 vs 3456.
- ▲Ray tracing cores — 55.56% more. 84 vs 54.
- ▲3DMark Time Spy — 27.03% more. 18800 vs 14800.
Spec comparison
Core
| Spec | AMD - Radeon RX 7700 XT | AMD - Radeon RX 7900 XT |
|---|---|---|
| Chipset | Navi 32 | Navi 31 |
| Base clockⓘ | 1700 MHzlead | 1500 MHz |
| Boost clockⓘ | 2544 MHzlead | 2400 MHz |
| CUDA / Stream coresⓘ | 3456 | 5376lead |
| Ray tracing coresⓘ | 54 | 84lead |
Memory
| Spec | AMD - Radeon RX 7700 XT | AMD - Radeon RX 7900 XT |
|---|---|---|
| VRAMⓘ | 12 GB | 20 GBlead |
| VRAM typeⓘ | GDDR6 | GDDR6 |
| Memory busⓘ | 192 bit | 320 bitlead |
Power & Form
| Spec | AMD - Radeon RX 7700 XT | AMD - Radeon RX 7900 XT |
|---|---|---|
| TDPⓘ | 245 Wlead | 315 W |
| Recommended PSUⓘ | 700 Wlead | 750 W |
| Length | 267 mmlead | 276 mm |
| Slot size | 2.5-slot | 2.5-slot |
Benchmarks
| Spec | AMD - Radeon RX 7700 XT | AMD - Radeon RX 7900 XT |
|---|---|---|
| 3DMark Time Spyⓘ | 14800 | 18800lead |
| DLSSⓘ | false | false |
| FSRⓘ | true | true |
Frequently asked
Which has more VRAM, Radeon RX 7700 XT or Radeon RX 7900 XT?+
Radeon RX 7900 XT ships with 20GB GDDR6 vs 12GB.
Which scores higher in 3DMark Time Spy, Radeon RX 7700 XT or Radeon RX 7900 XT?+
Radeon RX 7900 XT scores 18800 vs 14800.
Which draws less power, Radeon RX 7700 XT or Radeon RX 7900 XT?+
Radeon RX 7700 XT draws 245W TDP vs 315W.