ASUS - ROG Astral RTX 5090 OC vs NVIDIA - GeForce RTX 4090
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 | NVIDIA - GeForce RTX 4090 |
|---|---|---|
| TDP | 600 W | 450 W |
| 3DMark Time Spy | 44000 | 28000 |
| VRAM | 32 GB | 24 GB |
| Memory bus | 512 bit | 384 bit |
| CUDA / Stream cores | 21760 | 16384 |
| Ray tracing cores | 170 | 128 |
Between the ROG Astral RTX 5090 OC and GeForce RTX 4090, the ROG Astral RTX 5090 OC comes out ahead in 3dmark time spy / vram, while the GeForce RTX 4090 wins on tdp. Overall, the ROG Astral RTX 5090 OC scores 86.5 and the GeForce RTX 4090 scores 78 on our Mars Score.
Which should you buy?
The ROG Astral RTX 5090 OC is the clear pick on raw spec strength, leading by 8.5 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 3dmark time spy, vram, memory bus, among others. The single most decisive one: 3DMark Time Spy — 57.14% more. 44000 vs 28000.
Pick the GeForce RTX 4090 if you care most about tdp. Its strongest claims are tdp. The single most decisive one: TDP — 150.00 W less. 450 vs 600.
Both ship with comparable dlss, so those specs do not separate the two — focus on the differences below.
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 NVIDIA - GeForce RTX 4090?
ASUS - ROG Astral RTX 5090 OC leads the current Mars Score by 8.5 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 timespy score, vram gb, memory bus bit.
Choose NVIDIA - GeForce RTX 4090 if…
NVIDIA - GeForce RTX 4090 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
- ▲3DMark Time Spy — 57.14% more. 44000 vs 28000.
- ▲VRAM — 33.33% more. 32 GB vs 24 GB.
- ▲Memory bus — 33.33% more. 512 bit vs 384 bit.
- ▲CUDA / Stream cores — 32.81% more. 21760 vs 16384.
- ▲Ray tracing cores — 32.81% more. 170 vs 128.
- ▲Boost clock — 5.36% more. 2655 MHz vs 2520 MHz.
Why NVIDIA - GeForce RTX 4090 wins
- ▲TDP — 150.00 W less. 450 vs 600.
Spec comparison
Core
| Spec | ASUS - ROG Astral RTX 5090 OC | NVIDIA - GeForce RTX 4090 |
|---|---|---|
| Chipset | GB202 | AD102 |
| Base clockⓘ | 2017 MHz | 2235 MHzlead |
| Boost clockⓘ | 2655 MHzlead | 2520 MHz |
| CUDA / Stream coresⓘ | 21760lead | 16384 |
| Ray tracing coresⓘ | 170lead | 128 |
Memory
| Spec | ASUS - ROG Astral RTX 5090 OC | NVIDIA - GeForce RTX 4090 |
|---|---|---|
| VRAMⓘ | 32 GBlead | 24 GB |
| VRAM typeⓘ | GDDR7lead | GDDR6X |
| Memory busⓘ | 512 bitlead | 384 bit |
Power & Form
| Spec | ASUS - ROG Astral RTX 5090 OC | NVIDIA - GeForce RTX 4090 |
|---|---|---|
| TDPⓘ | 600 W | 450 Wlead |
| Recommended PSUⓘ | 1200 W | 850 Wlead |
| Length | 357 mm | 304 mmlead |
| Slot size | 4-slot | 3-slot |
Benchmarks
| Spec | ASUS - ROG Astral RTX 5090 OC | NVIDIA - GeForce RTX 4090 |
|---|---|---|
| 3DMark Time Spyⓘ | 44000lead | 28000 |
| DLSSⓘ | true | true |
| FSRⓘ | false | false |
Frequently asked
Which has more VRAM, ROG Astral RTX 5090 OC or GeForce RTX 4090?+
ROG Astral RTX 5090 OC ships with 32GB GDDR7 vs 24GB.
Which scores higher in 3DMark Time Spy, ROG Astral RTX 5090 OC or GeForce RTX 4090?+
ROG Astral RTX 5090 OC scores 44000 vs 28000.
Which draws less power, ROG Astral RTX 5090 OC or GeForce RTX 4090?+
GeForce RTX 4090 draws 450W TDP vs 600W.