RTX 3090 vs RTX 4090: prices and VRAM (US)
Recorded Amazon US quotes for the RTX 3090 and RTX 4090, side by side. Each lowest price links to the model page, where every listing is shown with its condition and record dates. All GPU comparisons.
Recorded Amazon US prices
| RTX 3090 | RTX 4090 | |
|---|---|---|
| VRAM options listed | 24GB | 24GB |
| Listings | 28 | 6 |
| Lowest New price | None recorded | $4,490.00 |
| Lowest Used price | $1,699.99 | $3,199.99 |
| Median price | $1,959.99 | $4,539.50 |
| Lowest price per GB of VRAM | $70.83 | $133.33 |
Median price covers New, Used and unconfirmed-condition listings. Price per GB is price divided by video memory, not a performance score.
Official specifications
| RTX 3090 | RTX 4090 | |
|---|---|---|
| VRAM | 24GB | 24GB |
| Memory type | GDDR6X | GDDR6X |
| Memory bus | 384-bit | 384-bit |
| Rated power (NVIDIA TGP, AMD TBP) | 350W | 450W |
Sources: RTX 3090 specifications and RTX 4090 specifications. We have not benchmarked these cards.
Which should you buy?
Both GPUs have 24GB of GDDR6X, so for local AI they hold the same model sizes; the choice mostly comes down to price, condition, rated power and the exact board. In this catalog, the RTX 3090 has the lower median recorded price ($1,959.99 against $4,539.50). The lowest recorded price per GB of VRAM is $70.83 for the RTX 3090. Memory capacity does not measure speed, and these are recorded Amazon US quotes rather than live checkout prices, so confirm the current offer, condition, exact board and your power supply before buying.
Use the LLM VRAM estimator to check how much memory your model needs, then compare listings on the RTX 3090 page and the RTX 4090 page.
RTX 3090 vs RTX 4090 questions
Which is cheaper on Amazon US, the RTX 3090 or the RTX 4090?
The lowest recorded RTX 3090 price is $1,699.99 (median $1,959.99 across 28 listings). The lowest recorded RTX 4090 price is $3,199.99 (median $4,539.50 across 6 listings). By median recorded price, the RTX 3090 is cheaper in this catalog. Condition matters: compare New and Used listings separately.
Which has more VRAM, the RTX 3090 or the RTX 4090?
NVIDIA specifications list 24GB for the RTX 3090 and 24GB for the RTX 4090. More VRAM lets you load larger local AI models or use longer context, but it does not measure speed.
Are these RTX 3090 and RTX 4090 prices live?
No. They are recorded Amazon US quotes observed between 2026-09-29 16:16:12 UTC and 2026-10-27 05:15:07 UTC, not live checkout prices. The price, condition and availability shown on Amazon at checkout apply.