The RTX 4090 is the stronger card for gaming and dominant for AI, while the RX 7900 XTX — with the same 24 GB VRAM at roughly half the price — is the runaway value winner. Buy the 4090 for performance and AI; buy the 7900 XTX for the best gaming dollar-for-dollar.
Quick answer. Both flagships pack 24 GB of VRAM, but they target different buyers. The 4090 is faster in games and far ahead in AI (thanks to CUDA and much higher AI scores), and it has DLSS and Frame Generation. The 7900 XTX is dramatically cheaper and hugely efficient in value terms, making it a superb pure-gaming card if you don’t need CUDA or top-tier ray tracing.
Quick answer: NVIDIA GeForce RTX 4090 leads on both gaming and AI workloads. AMD Radeon RX 7900 XTX gives the best performance per dollar of the group. Look at VRAM and memory bandwidth for capability, TDP for power and heat, and separate gaming vs AI performance scores. Then weigh new and used prices, and cloud rental cost if you only need the card occasionally. Not necessarily. TDP measures power draw, not performance. A newer architecture can deliver more frames or tokens per watt, so always compare performance scores alongside power, not power alone. Used cards can offer far better value, especially previous-generation flagships. Factor in the lack of warranty and unknown wear. This tool lists both new and used reference prices so you can judge the gap. Head-to-head comparison
Spec
NVIDIA GeForce RTX 4090
AMD Radeon RX 7900 XTX
VRAM
24 GB (winner)
24 GB
Bandwidth
1008 GB/s (winner)
960 GB/s
TDP (power)
450 W
355 W (winner)
Gaming score
95/100 (winner)
86/100
AI score
96/100 (winner)
60/100
Price (new)
$1,900
$850 (winner)
Price (used)
$1,550
$620 (winner)
Cloud rent $/hr
$0.34
$0.30 (winner)
Best for
Gaming, AI / LLMs
Best value, Efficiency
Get it
GPU reference specs
GPU
VRAM
TDP
Bandwidth
Street price
Cloud $/hr
Released
NVIDIA GeForce RTX 5090
32 GB
575 W
1792 GB/s
$2,500
$0.69
2025
NVIDIA GeForce RTX 5080
16 GB
360 W
960 GB/s
$1,200
$0.40
2025
NVIDIA GeForce RTX 5070
12 GB
250 W
672 GB/s
$650
$0.25
2025
NVIDIA GeForce RTX 4090
24 GB
450 W
1008 GB/s
$1,900
$0.34
2022
NVIDIA GeForce RTX 4080
16 GB
320 W
717 GB/s
$1,100
$0.28
2022
NVIDIA GeForce RTX 4070
12 GB
200 W
504 GB/s
$550
$0.20
2023
NVIDIA GeForce RTX 3090
24 GB
350 W
936 GB/s
$900
$0.22
2020
NVIDIA GeForce RTX 3060 12GB
12 GB
170 W
360 GB/s
$280
$0.12
2021
NVIDIA A100 80GB
80 GB
400 W
2039 GB/s
$8,000
$1.10
2020
NVIDIA H100 80GB
80 GB
700 W
3350 GB/s
$25,000
$2.49
2022
AMD Radeon RX 7900 XTX
24 GB
355 W
960 GB/s
$850
$0.30
2022
Intel Arc B580
12 GB
190 W
456 GB/s
$250
N/A
2024
Frequently asked questions
How do I compare two GPUs?
Is a higher TDP GPU always faster?
Should I buy new or used when comparing GPUs?
Which should you buy?
- Gaming: the 4090 leads, especially in ray tracing and with DLSS. The 7900 XTX is very strong in rasterization for far less money.
- AI / creative with CUDA: the 4090, decisively — most AI tooling is built for NVIDIA, and the 7900 XTX’s AI score is much lower.
- Value gaming: the 7900 XTX wins clearly on performance per dollar.
Key differences
- VRAM: both 24 GB.
- AI ecosystem: NVIDIA/CUDA (4090) vs AMD/ROCm (7900 XTX) — a major factor for AI.
- Features: DLSS + Frame Generation on the 4090; the 7900 XTX uses FSR.
- Price: the 7900 XTX is far cheaper new and used.
New, used, or cloud
For AI, rent an NVIDIA card in the cloud rather than buying an AMD card that your tools may not support well — see cloud GPUs. For gaming value, a new or used 7900 XTX is hard to beat.
People also ask
Is the RTX 4090 better than the 7900 XTX? For AI and ray-traced gaming, yes. For rasterized gaming value, the 7900 XTX offers similar frame rates for much less money. Can the RX 7900 XTX do AI work? It can, but most AI software targets NVIDIA CUDA, so support and performance lag. For serious AI, an NVIDIA card (owned or rented) is the safer choice.
Related: RTX 4090 vs A100 80GB · RTX 5090 vs RTX 4090 · All GPU comparisons