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NVIDIA DGX Spark 128GB vs NVIDIA RTX PRO 6000 Blackwell

For running models locally, priced in the US. At 128k context the first runs 42 models fully in memory, the second 39.

In short

The NVIDIA DGX Spark 128GB has more memory for models: 128 GB against 96 GB. At 128k context the NVIDIA DGX Spark 128GB runs 42 of the models we track fully in memory and the NVIDIA RTX PRO 6000 Blackwell 39; only the NVIDIA DGX Spark 128GB holds DeepSeek V4 Flash. On the models both run fully in memory, the NVIDIA RTX PRO 6000 Blackwell is about 6.6× as fast as the NVIDIA DGX Spark 128GB (estimated, median across models). In the US the NVIDIA DGX Spark 128GB costs $7,399 at eBay and the NVIDIA RTX PRO 6000 Blackwell $8,000 at Amazon: the NVIDIA DGX Spark 128GB is $601 cheaper.

Updated . Speeds are estimates; how they are worked out.

NVIDIA DGX Spark 128GB

$7,399

eBay

Add to build
NVIDIA RTX PRO 6000 Blackwell

$8,000

Amazon

Add to build

Specifications

SpecNVIDIA DGX Spark 128GBNVIDIA RTX PRO 6000 Blackwell
ChipGB10 Grace Blackwell–
Memory bus256-bit512-bit
Memory bandwidth273 GB/s1,792 GB/s
FP16 compute62 TFLOPS504 TFLOPS
SoftwareCUDACUDA
Unified memory128 GB–
GPU can use by default119 GB–
GPU can use, tuned122 GB–
Operating systemdgx-os–
Processor20-core Arm (GB10)–
Storage4000 GB–
GPU–RTX PRO 6000 Blackwell
Memory–96 GB GDDR7
Board power–600 W
PCIe generation–Gen 5
PCIe lanes–x16

What each runs

Estimated decode speed with the most precise quant that fits each one est.

ModelNVIDIA DGX Spark 128GBNVIDIA RTX PRO 6000 Blackwell
DeepSeek V4 Flash6tok/sUD-Q2_K_XLoffload
GLM 5.3 Flash10tok/sUD-Q2_K_XLoffload
Qwen 3.8 Flash Next3tok/sUD-Q4_K_XL20tok/sUD-Q3_K_XL
Qwen 3.8 27B5tok/sQ8_029tok/sQ8_0
MiniMax M2.73tok/sUD-Q2_K_XLoffload
Qwen 3.5 122B-A10B9tok/sQ6_K62tok/sQ5_K_M
Qwen 3.6 27B5tok/sQ8_030tok/sQ8_0
Qwen3 Coder Next14tok/sQ8_090tok/sQ8_0
gpt-oss 120B13tok/sMXFP484tok/sMXFP4
Nemotron 3 Super 120B-A12B8tok/sUD-Q6_K72tok/sUD-Q4_K_M
Gemma 4 31B4tok/sQ8_025tok/sQ8_0
Mistral Small 4 119B11tok/sUD-Q6_K80tok/sUD-Q5_K_M
Qwen 3.6 35B-A3B17tok/sQ8_0114tok/sQ8_0
Qwen 3.5 27B5tok/sQ8_030tok/sQ8_0
Gemma 4 26B-A4B14tok/sQ8_095tok/sQ8_0
GLM 4.5 Air3tok/sQ6_K19tok/sQ4_K_M
Qwen 3.5 35B-A3B17tok/sQ8_0114tok/sQ8_0
Qwen3 Next 80B-A3B16tok/sQ8_0104tok/sQ8_0
GLM 4.7 Flash8tok/sQ8_054tok/sQ8_0
Devstral Small 2 24B4tok/sQ8_024tok/sQ8_0
Nemotron 3.5 Lightning 30B-A3B24tok/sUD-Q6_K_XL160tok/sUD-Q6_K_XL
Kimi Linear 48B-A3B24tok/sQ8_0155tok/sQ8_0
gpt-oss 20B18tok/sMXFP4118tok/sMXFP4
Qwen3 Coder 30B-A3B6tok/sQ8_042tok/sQ8_0
Qwen3 32B2tok/sQ8_016tok/sQ8_0
Gemma 4 12B11tok/sQ8_073tok/sQ8_0
Qwen 3.5 9B12tok/sQ8_080tok/sQ8_0
Gemma 3 27B4tok/sQ8_028tok/sQ8_0
Mistral Small 3.2 24B4tok/sQ8_024tok/sQ8_0
DeepSeek R1 Distill Qwen 32B2tok/sQ8_016tok/sQ8_0
Llama 3.3 70B1tok/sQ8_012tok/sQ5_K_M
Ministral 3 14B5tok/sQ8_031tok/sQ8_0
Qwen3 14B5tok/sQ8_030tok/sQ8_0
DeepSeek R1 0528 Qwen3 8B6tok/sQ8_040tok/sQ8_0
Qwen3 8B6tok/sQ8_040tok/sQ8_0
Phi-4 14B4tok/sQ8_026tok/sQ8_0
Qwen 3.5 4B19tok/sQ8_0126tok/sQ8_0
Ministral 3 8B6tok/sQ8_041tok/sQ8_0
Granite 4.2 8B6tok/sQ8_036tok/sQ8_0
Gemma 4 E4B14tok/sQ8_093tok/sQ8_0
LFM2.5 8B-A1B14tok/sQ8_089tok/sQ8_0
Llama 3.1 8B7tok/sQ6_K47tok/sQ6_K

Questions

Which is better for local AI, the NVIDIA DGX Spark 128GB or the NVIDIA RTX PRO 6000 Blackwell?
Choose the NVIDIA DGX Spark 128GB to run bigger models. Choose the NVIDIA RTX PRO 6000 Blackwell for speed. Choose the NVIDIA DGX Spark 128GB to spend less.
Which can run bigger models, the NVIDIA DGX Spark 128GB or the NVIDIA RTX PRO 6000 Blackwell?
At 128k context the NVIDIA DGX Spark 128GB runs 42 of the models we track fully in memory and the NVIDIA RTX PRO 6000 Blackwell 39; only the NVIDIA DGX Spark 128GB holds DeepSeek V4 Flash.
Which is faster for local AI, the NVIDIA DGX Spark 128GB or the NVIDIA RTX PRO 6000 Blackwell?
On the models both run fully in memory, the NVIDIA RTX PRO 6000 Blackwell is about 6.6× as fast as the NVIDIA DGX Spark 128GB (estimated, median across models).
What is the price difference between the NVIDIA DGX Spark 128GB and the NVIDIA RTX PRO 6000 Blackwell?
In the US the NVIDIA DGX Spark 128GB costs $7,399 at eBay and the NVIDIA RTX PRO 6000 Blackwell $8,000 at Amazon: the NVIDIA DGX Spark 128GB is $601 cheaper.

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