RTX 4080 vs RTX 4090 — is the used flagship worth the jump?

RTX 4080 vs RTX 4090: 16GB value or 24GB ceiling?

Hardware advice reviewed 2026-10-04 · asking-price samples checked for freshness · Methodology

Verdict: The 4080 has 16GB and the 4090 has 24GB. Pay for the extra capacity if the full workload needs it, or for performance supported by a matching benchmark. Neither capacity is a universal model-size guarantee.

	RTX 4080	RTX 4090
Historical editorial estimate	$900 ($775–$1,050)	$2,325 ($1,975–$2,750)
eBay median (filtered)	—	—
Memory	16GB VRAM	24GB VRAM
$ / GB (sample median)	Unavailable	Unavailable
Power	320W TDP	450W TDP
Launch MSRP	$1,199	$1,599

Fair values are historical editorial estimates, not current offers; eBay medians are filtered Buy-It-Now samples, not checkout prices. See how we compute these.

Affiliate disclosure: Affiliate (paid) links: we may earn a commission from eBay Partner Network and Amazon Associates at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Full disclosure.

Verify model fit before buying

Memory capacity alone cannot tell you which models run. Check the artifact, runtime, context and concurrency, including cache and working buffers. Mac memory is shared with the operating system. See our memory sizing guide.

We have not benchmarked these configurations. Hardware advice reviewed 2026-10-04. Check the sources below for supported hardware and software requirements.

Capacity before the upgrade

Use the exact artifact and intended context to estimate peak memory. More VRAM can prevent offloading, but smaller models may already fit the 4080. Image generation and fine-tuning have different memory requirements from chat inference.

Price and alternatives

Compare current samples for both cards. A 24GB RTX 3090 is another capacity option if your software supports it; compare its condition, runtime performance and platform requirements too.

Sources and review

FAQ

How do I know whether my model will fit?

Check the exact artifact, runtime, context and concurrency. Allow for cache and working memory; installed capacity alone is not a fit test.

Which is the better value today?

First confirm that the hardware supports your workload. Then compare dated asking-price samples, condition, checkout cost and any required system upgrades. Historical editorial fair values are not current offers.

Also consider

Model	Memory	Fair value	eBay median
RTX 4080 Super	16GB	$1,000	—
RTX 3090	24GB	$1,200	—