RTX 3080 vs RTX 4070 — used price and value comparison

RTX 3080 vs RTX 4070: cheap veteran or efficient successor?

Editorial comparison updated 2026-07-26 · live eBay medians refresh daily · Methodology

Verdict: Raster performance is close, so this is a price-versus-refinement call. The 3080 is the raw-FPS bargain of the used market, but it is a 320W, 10GB, mining-era card. The 4070 costs more used and buys 12GB of VRAM, frame generation, FP8 support, and roughly 120W less heat. For local AI the extra 2GB matters more than it sounds, because 13–14B models fit at Q4 where 10GB chokes. Tight budget and gaming only: 3080. Everything else: 4070.

	RTX 3080 10GB	RTX 4070
Fair used value	$350 ($300–$425)	$525 ($450–$625)
eBay median (filtered)	$450 29% over fair	$625 19% over fair
Memory	10GB VRAM	12GB VRAM
$ / GB (at fair value)	$35	$44
Power	320W TDP	200W TDP
Launch MSRP	$699	$599

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

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What each can run locally

Model class (weights @ Q4)	RTX 3080 10GB · 10GB	RTX 4070 · 12GB
7–8B @ Q4 (Llama 3.1 8B, Qwen3 8B)	✓ fits	✓ fits
14B @ Q4 (DeepSeek-R1 14B distill)	— too big	✓ fits
30B MoE @ Q4 (Qwen3-coder 30B)	— too big	— too big
32B dense @ Q4 (Qwen3 32B, R1 32B)	— too big	— too big
70B dense @ Q4 (Llama 3.3 70B)	— too big	— too big
100B+ MoE (gpt-oss-120b class)	— too big	— too big

Approximate weights-only footprints — long context and KV cache need additional memory headroom.

Performance and efficiency

At 1440p the two trade blows in pure rasterization, with the 4070 pulling ahead wherever DLSS 3 frame generation applies. The efficiency gap is not close: roughly 200W versus 320W under load changes case, PSU, and noise requirements.

The 3080 pool is older and mining-heavy — budget time for the usual checks (thermal pads, fan noise, seller returns). The 4070 used pool is younger and cleaner.

VRAM: 10GB vs 12GB

For gaming today, 10GB is still mostly fine at 1440p. For local AI it is the difference between running 13–14B models at Q4 (12GB) and being stuck at 7–8B (10GB). If models are anywhere in your plans, that alone settles it.

Price math

Check the live medians above — the gap between the cards is what you pay for modernity. When 3080 prices dip well under fair, its raw performance-per-dollar is nearly unbeatable for a pure gaming box.

FAQ

Is the RTX 3080 still worth buying used?

For 1440p gaming on a budget, yes — few cards match its speed at the price. Insist on seller returns and ask about mining history; it is a 2020 card and most have lived hard lives.

Is the RTX 4070 better than the RTX 3080?

They are similar in raster speed. The 4070 wins on VRAM (12GB vs 10GB), power (about 200W vs 320W), DLSS 3 frame generation, and FP8 for AI workloads. The 3080 wins on used price.

Which is better for local AI, 3080 or 4070?

The 4070. Its 12GB runs 13–14B models at Q4 comfortably; 10GB does not. Neither is a serious image-generation or 30B-class card — that tier starts at 16–24GB.

Also consider

Model	Memory	Fair value	eBay median
RTX 3080 12GB	12GB	$450	$480
RTX 4070 Super	12GB	$480	$800