The RTX 4090 is clearly faster with 24 GB of VRAM vs the 4080’s 16 GB, but the 4080 costs less and is more efficient. Buy the 4090 for 4K and AI headroom; buy the 4080 for the better value if 16 GB is enough.
Quick answer. Same generation, two tiers. The 4090’s extra VRAM and higher bandwidth make it the better choice for 4K gaming and AI models that need more than 16 GB. The 4080 wins on price and performance per dollar, and its 16 GB is plenty for high-refresh 1440p and many workloads.
Quick answer: NVIDIA GeForce RTX 4090 leads on both gaming and AI workloads. NVIDIA GeForce RTX 4080 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 4080
NVIDIA GeForce RTX 4090
VRAM
16 GB
24 GB (winner)
Bandwidth
717 GB/s
1008 GB/s (winner)
TDP (power)
320 W (winner)
450 W
Gaming score
85/100
95/100 (winner)
AI score
80/100
96/100 (winner)
Price (new)
$1,100 (winner)
$1,900
Price (used)
$850 (winner)
$1,550
Cloud rent $/hr
$0.28 (winner)
$0.34
Best for
Best value, Efficiency
Gaming, AI / LLMs
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?
- 4K gaming: the 4090 has meaningful headroom; the 4080 is still very capable.
- AI: the 4090’s 24 GB fits larger models than the 4080’s 16 GB — pick it if VRAM matters.
- Value: the 4080 wins per dollar and per watt.
Key differences
- VRAM: 24 GB vs 16 GB.
- Bandwidth & performance: the 4090 leads both.
- Price & power: the 4080 is cheaper and less power-hungry.
New, used, or cloud
If you occasionally need 24 GB, renting a 4090 can be cheaper than buying up from a 4080 — see rates. Otherwise a used 4080 is a strong value.
People also ask
Is the RTX 4090 worth the extra money over the 4080? For 4K and AI needing 24 GB, yes. For 1440p gaming and 16 GB-friendly workloads, the 4080 offers better value. How much more VRAM does the 4090 have? 24 GB vs 16 GB — 50% more, which is the main reason to choose it for AI or future 4K titles.
Related: RTX 5080 vs RTX 4090 · RTX 5090 vs RTX 4090 · All GPU comparisons