ASUS - ROG Astral RTX 5090 OC vs AMD - Radeon RX 7800 XT
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | ASUS - ROG Astral RTX 5090 OC | AMD - Radeon RX 7800 XT |
|---|---|---|
| CUDA / Stream cores | 21760 | 3840 |
| TDP | 600 W | 263 W |
| Ray tracing cores | 170 | 60 |
| 3DMark Time Spy | 44000 | 16500 |
| VRAM | 32 GB | 16 GB |
| Memory bus | 512 bit | 256 bit |
Between the ROG Astral RTX 5090 OC and Radeon RX 7800 XT, the ROG Astral RTX 5090 OC comes out ahead in cuda / stream cores / ray tracing cores, while the Radeon RX 7800 XT wins on tdp. Overall, the ROG Astral RTX 5090 OC scores 86.5 and the Radeon RX 7800 XT scores 63.9 on our Mars Score.
Which should you buy?
The ROG Astral RTX 5090 OC is the clear pick on raw spec strength, leading by 22.6 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the ROG Astral RTX 5090 OC if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. The biggest gaps in its favor are cuda / stream cores, ray tracing cores, 3dmark time spy, among others. The single most decisive one: CUDA / Stream cores — 466.67% more. 21760 vs 3840.
Pick the Radeon RX 7800 XT if you care most about tdp. Its strongest claims are tdp. The single most decisive one: TDP — 337.00 W less. 263 vs 600.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: the ROG Astral RTX 5090 OC 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: ASUS - ROG Astral RTX 5090 OC or AMD - Radeon RX 7800 XT?
ASUS - ROG Astral RTX 5090 OC leads the current Mars Score by 22.6 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 ASUS - ROG Astral RTX 5090 OC if…
ASUS - ROG Astral RTX 5090 OC has the measurable edge on cuda cores, ray tracing cores, timespy score.
Choose AMD - Radeon RX 7800 XT if…
AMD - Radeon RX 7800 XT has the measurable edge on tdp w.
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 ASUS - ROG Astral RTX 5090 OC wins
- ▲CUDA / Stream cores — 466.67% more. 21760 vs 3840.
- ▲Ray tracing cores — 183.33% more. 170 vs 60.
- ▲3DMark Time Spy — 166.67% more. 44000 vs 16500.
- ▲VRAM — 100.00% more. 32 GB vs 16 GB.
- ▲Memory bus — 100.00% more. 512 bit vs 256 bit.
- ▲Boost clock — 9.26% more. 2655 MHz vs 2430 MHz.
- ▲Has DLSS.
Why AMD - Radeon RX 7800 XT wins
- ▲TDP — 337.00 W less. 263 vs 600.
Spec comparison
Core
| Spec | ASUS - ROG Astral RTX 5090 OC | AMD - Radeon RX 7800 XT |
|---|---|---|
| Chipset | GB202 | Navi 32 |
| Base clockⓘ | 2017 MHzlead | 1295 MHz |
| Boost clockⓘ | 2655 MHzlead | 2430 MHz |
| CUDA / Stream coresⓘ | 21760lead | 3840 |
| Ray tracing coresⓘ | 170lead | 60 |
Memory
| Spec | ASUS - ROG Astral RTX 5090 OC | AMD - Radeon RX 7800 XT |
|---|---|---|
| VRAMⓘ | 32 GBlead | 16 GB |
| VRAM typeⓘ | GDDR7lead | GDDR6 |
| Memory busⓘ | 512 bitlead | 256 bit |
Power & Form
| Spec | ASUS - ROG Astral RTX 5090 OC | AMD - Radeon RX 7800 XT |
|---|---|---|
| TDPⓘ | 600 W | 263 Wlead |
| Recommended PSUⓘ | 1200 W | 700 Wlead |
| Length | 357 mm | 267 mmlead |
| Slot size | 4-slot | 2.5-slot |
Benchmarks
| Spec | ASUS - ROG Astral RTX 5090 OC | AMD - Radeon RX 7800 XT |
|---|---|---|
| 3DMark Time Spyⓘ | 44000lead | 16500 |
| DLSSⓘ | truelead | false |
| FSRⓘ | false | truelead |
Frequently asked
Which has more VRAM, ROG Astral RTX 5090 OC or Radeon RX 7800 XT?+
ROG Astral RTX 5090 OC ships with 32GB GDDR7 vs 16GB.
Which scores higher in 3DMark Time Spy, ROG Astral RTX 5090 OC or Radeon RX 7800 XT?+
ROG Astral RTX 5090 OC scores 44000 vs 16500.
Which draws less power, ROG Astral RTX 5090 OC or Radeon RX 7800 XT?+
Radeon RX 7800 XT draws 263W TDP vs 600W.