Can the Radeon RX 7800 XT run DeepSeek V4 Flash?
Does not fit at Q4_K_M.
DeepSeek V4 Flash is 284B parameters (MoE; all experts resident). At Q4_K_M the weights are about 158.7 GiB; with the 1.5 GiB runtime reserve that is 160.2 GiB against the card's 16GB, about 144.2 GiB more than the card has.
All three quants
16GB card| Quant | Weights | With reserve | Verdict | Headroom |
|---|---|---|---|---|
| Q4_K_Mthe everyday quant | 158.7 GiB | 160.2 GiB | Does not fit | short 144.2 GiB |
| Q8_0near-lossless | 280.4 GiB | 281.9 GiB | Does not fit | short 265.9 GiB |
| FP16full weights | 529.0 GiB | 530.5 GiB | Does not fit | short 514.5 GiB |
Verdict rules: fits comfortably when weights plus reserve sit within 85% of VRAM; tight when they fit with little left for context; CPU offload when they exceed VRAM by up to 2x (runs, slowly, with layers in system RAM); no beyond that. The KV cache per token depends on the model's architecture and is not modelled here.
The numbers for this pairing
At Q4_K_M the weights take about 158.7 GiB, so with the 1.5 GiB runtime reserve it needs 160.2 GB: 144.2 GB more than the card's 16 GB.
No version of it fits entirely in this card's memory, so it would lean on system RAM and run far slower.
It is a mixture-of-experts model: about 13B of its 284B parameters work on each token, which helps speed, but all of them still have to fit in memory.
At about $599, this card costs roughly $37 per GB of VRAM.
Running it at its full 263 W board power for 4 hours a day would use about 32 kWh a month, about $5.81 at the US average residential rate of 18.4 cents per kWh (2026-05); real use sits below that ceiling.
Prices are the lowest current listings our tracker saw on Oct 7, 2026, since averages include premium variants; launch prices are marked where we have no listing.
Not this card. These fit it comfortably at Q4.
Nothing in the consumer catalog fits DeepSeek V4 Flash at Q4 on a single card; this is multi-GPU or datacenter territory, or a job for hosted inference (see PicksByModel for per-token pricing).
What the Radeon RX 7800 XT does run well → · DeepSeek V4 Flash on every card →
About the model
DeepSeek V4 Flash by DeepSeek: 1,048,576-token native context, text, released 2026 under the MIT. Model card → · Hosted pricing on PicksByModel →