NVIDIA DGX Spark: which models actually run on it
The DGX Spark is the cheapest box that runs frontier-class open weights locally: 128GB of unified memory on the GB10 Grace Blackwell superchip, 273GB/s of bandwidth, in a quiet desktop form factor. Stack two over ConnectX-7 and you get a 256GB unified pool - enough for DeepSeek V4 Flash 0731's lossless 4-bit build. Below is every model in the catalog that fits, split by what runs on one Spark versus what needs two.
The box
- Memory
- 128GB unified
- Bandwidth
- 273GB/s
- Chip
- GB10 (DGX Spark)
- Price
- $4,699
Water-cooled, roughly 35 dBA, launched 2025. Unified memory means a model loads into one pool shared across the whole SoC - no offload between discrete cards. Founders Edition price; see the hardware page for full specs.
DeepSeek V4 Flash 0731 on two DGX Sparks
The 2026-07-31 iterative update of V4 Flash (a 10-point Artificial Analysis Intelligence Index jump to 50) landed local inference via Unsloth's Dynamic 2.0 GGUFs. The lossless 4-bit build (UD-Q4_K_XL) needs about 168GB in RAM - it does not fit a single 128GB Spark, but two stacked over ConnectX-7 give a 256GB unified pool and it runs. The 8-bit full-precision build (UD-Q8_K_XL, about 175GB) fits the same pair.
Runs on a single 128GB Spark
These models have a local variant that fits in 128GB. The quant listed is the smallest build that fits; a larger quant on the same model may also fit and run at higher quality.
Needs two Sparks (256GB unified)
These models' smallest local build is bigger than 128GB but fits in the 256GB unified pool you get from two stacked DGX Sparks (or any 192GB+ unified rig). The quant listed is the smallest build that fits the two-Spark budget.
Why a Spark, not a cloud key
A DGX Spark is a one-time purchase that runs every open-weight model that fits, with no per-token bill and no data leaving your desk. For a team spending more than a few hundred dollars a month on API tokens, owning the box is usually cheaper inside the first year - and the model you run today is not the model you are locked into.