The RTX 4090 is faster for gaming and far better value, but the A100’s 80 GB of VRAM and higher bandwidth make it the choice for large AI models that won’t fit on a 4090. Buy a 4090 for gaming and small-to-mid AI; rent an A100 for big models.
Quick answer. These cards barely overlap in purpose. The 4090 is a gaming flagship that’s also a strong, affordable AI card — for models that fit in 24 GB. The A100 is a data-center GPU with 80 GB and higher bandwidth, built for large models and multi-GPU scaling, at a much higher cost that almost always makes renting the right move.
Quick answer: NVIDIA GeForce RTX 4090 is the stronger gaming card, while NVIDIA A100 80GB pulls ahead on AI and large-model work. NVIDIA GeForce RTX 4090 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
NVIDIA A100 80GB
VRAM
24 GB
80 GB (winner)
Bandwidth
1008 GB/s
2039 GB/s (winner)
TDP (power)
450 W
400 W (winner)
Gaming score
95/100 (winner)
60/100
AI score
96/100
98/100 (winner)
Price (new)
$1,900 (winner)
$8,000
Price (used)
$1,550 (winner)
$6,500
Cloud rent $/hr
$0.34 (winner)
$1.10
Best for
Gaming, Best value
AI / LLMs, 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 choose?
- Gaming: the 4090, easily — the A100 isn’t a gaming card.
- Small-to-mid AI (≤24 GB): the 4090 is faster per dollar and cheaper to own.
- Large models (needs 80 GB): the A100 is the only option here, and renting is the sensible path.
Key differences
- VRAM: 24 GB (4090) vs 80 GB (A100) — the deciding factor for model size.
- Bandwidth: the A100 is higher.
- Value & price: the 4090 is far cheaper to buy and to rent.
- Purpose: consumer flagship vs data-center accelerator.
Own the 4090, rent the A100
The practical setup for many builders: own a 4090 for daily work and gaming, and rent an A100 (or H100) by the hour when a model needs 80 GB. That keeps costs low and removes the VRAM ceiling on demand. Rent an A100 in the cloud.
People also ask
Is the RTX 4090 good for AI? Yes, for models that fit in its 24 GB it’s fast and great value. Beyond 24 GB you need a card like the A100, which is usually rented rather than bought. Why is the A100 more expensive than the 4090 if it’s slower in games? The A100 is a data-center GPU optimized for large-model AI, multi-GPU scaling, and 80 GB of memory — not gaming. You pay for VRAM capacity and enterprise features, not frame rates.
Related: A100 vs H100 · RTX 4090 vs RX 7900 XTX · Rent a cloud GPU