A used graphics card is tempting for local AI because video memory, not rasterization score, is often the constraint. A last-generation 24GB card can load models that a new 12GB card cannot. It is a bad buy when the "used from" price is close to, or above, a new card with a shop warranty.
Forge PC has not bought or tested the used listings below. New prices are SpecPrice's cheapest stock-checked UK shop figures, mostly from 13 November 2026; used figures are SpecPrice's "used from" prices, which include postage and are typically marketplace listings rather than shop-refurbished stock. The RTX 3090 new-price check is dated 12 November 2026, 08:05 GMT.
New versus used, this week
Card | VRAM | Cheapest new | Used from (incl. postage) | Notes |
|---|
RTX 5070 | 12GB | £597.99 at AWD-IT | £704.64 | Used is higher than new. |
RTX 5060 Ti 16GB | 16GB | £659.99 at Scan | £628.52 | Only a slim gap. |
RX 9070 | 16GB | £731.99 at AWD-IT | £699.00 | Small saving. |
RX 9070 XT | 16GB | £819.98 at Scan | £784.54 | Small saving. |
RTX 5070 Ti | 16GB | £1,215.00 at AWD-IT | £1,054.94 | About £160 below new. |
RTX 5080 | 16GB | £1,499.99 at Scan | £1,200.00 | Used saving, still a dear 16GB card. |
RTX 3090 | 24GB | £2,140.36 at GamingKit (checked 12 November 2026, 08:05 GMT) | £1,215.94 | The used 24GB case. New leftover stock is not a bargain. |
RTX 5090 | 32GB | £6,999.98 at Scan | £4,600.00 | A lot of money either way. |
The useful lesson is in the first row: a used RTX 5070 at £704.64 is a worse deal than a new one at £597.99. Always compare the used ask with the cheapest new stock-checked price on the same day.
The used RTX 3090 is the interesting AI-specific case. You pay about the same as a used 16GB RTX 5080, or about the same as a new RTX 5070 Ti, but you get 24GB of memory. llamaperf's figures (see the memory discussion in our local LLM GPU guide) are why that matters: a dense 30B-class model at Q4_K_M with an 8K context is around 20.8GB, which fits a 24GB card more comfortably than a 16GB one. A 70B Q4 model still needs far more than 24GB. New 3090 stock at over £2,100 is not a sensible way to get that memory.
An 8GB card, used or new, remains a tight fit for anything beyond small models or short context; see how much VRAM you need. Image generation has different memory patterns — our Flux and Stable Diffusion guide applies if that is the workload.
Checks before you pay
Compare with new. If the used price is within a few per cent of a new shop listing, buy new and keep the retailer warranty.
Prefer a named UK shop refurb or a returnable marketplace listing over a collection-only cash sale with no invoice. Ask whether any remaining manufacturer warranty is transferable; do not assume it is.
Match the exact model and memory size. "5070 Ti" should say 16GB; laptop chips and blower cards are not the same as a desktop board. Confirm the card will physically fit and that your PSU has the connectors and wattage the official spec sheet asks for.
Inspect photos and, if you can, the card. Bent fans, missing backplates, scored PCB edges or a missing anti-sag bracket are warning signs. A short seller history and a refusal to run a load demo are also reasons to walk away.
Budget for the rest of the PC. The GPU has to go in a desktop with enough airflow, system RAM and a fast SSD. A bargain 24GB card in a cramped, dusty case will throttle. The UK market overview is useful context for whether "cheap used" is actually cheap this month.
We are not going to invent a mining-detection ritual. If a seller cannot show the card working, or the price is far below the used-from figure in the table, treat it as a risk, not a coup.
Our verdict
A used GPU only makes sense for local AI when it is clearly cheaper than the same new card, or when it offers memory you cannot buy new at a sane price. On 13 November 2026, that second category is the used RTX 3090 at about £1,216 for 24GB — not a used RTX 5070, which was dearer than new. Compare every listing with SpecPrice's new price, favour a returnable seller, and size the card to the models you actually want to load. We have not purchased these used cards.
