A 70B model at Q4_K_M needs roughly 46 GB including 8k context (our estimate). Options: two 24 GB GPUs (used RTX 3090s are a common route), one RTX 5090 plus offload (slow), or a 128 GB unified-memory system.
| Model | Params (total / active) | Est. memory, Q4 @ 8k ctx | Est. memory, Q8 @ 8k ctx | Cheapest fit in our data (Q4) |
|---|---|---|---|---|
| Llama 3.3 70B | 70.6B / 70.6B | 46.8 GB | 78.7 GB | GMKtec EVO-X2 (128GB / 1TB) ($3,499.99, system, listed price) |
| DeepSeek-R1-Distill-Llama-70B | 70.6B / 70.6B | 46.8 GB | 78.7 GB | GMKtec EVO-X2 (128GB / 1TB) ($3,499.99, system, listed price) |
Parameter counts: Hugging Face: deepseek-ai/DeepSeek-R1 model card; Hugging Face: meta-llama/Llama-3.3-70B-Instruct. Memory figures are our estimates (see methodology), not measurements.
| System | Chip | Memory | Memory bandwidth | Price | Source |
|---|---|---|---|---|---|
| GMKtec EVO-X2 (128GB / 1TB) | AMD Ryzen AI Max+ 395 | 128 GB unified | 256 GB/s (computed: 256-bit × 8000 MT/s) | $3,499.99 (maker store, accessed 21 Oct 2026) | GMKtec: EVO-X2 product page (128GB + 1TB variant); AMD: Ryzen AI Max+ 395 specifications |
| NVIDIA DGX Spark (128GB) | NVIDIA GB10 Grace Blackwell | 128 GB unified | 273 GB/s | $4,699 (NVIDIA Founders Edition MSRP from Feb 2026; current marketplace price TBD) A 64GB configuration is sold through OEM partners. | NVIDIA: DGX Spark product page and specs; NVIDIA Developer Forums: DGX Spark price change announcement (Feb 2026) |
| Mac Studio (M5 Max 40-core GPU, 128GB) | Apple M5 Max | 128 GB unified | 614 GB/s | TBD | Apple: Mac Studio technical specifications |
| GPU | VRAM | Memory bandwidth | Launch MSRP (US) | Source |
|---|---|---|---|---|
| GeForce RTX 3090 | 24 GB | 936 GB/s | $1,499 Launch MSRP (2020); sold used today. Used price TBD. | NVIDIA: GeForce RTX 3090 specs; NVIDIA Newsroom (Sep 2020): RTX 30 Series pricing; Wikipedia: GeForce RTX 30 series (memory bandwidth table) |
| GeForce RTX 4090 | 24 GB | 1008 GB/s | $1,599 Launch MSRP (2022). Current price TBD. | NVIDIA: GeForce RTX 4090 specs; NVIDIA Newsroom (Sep 2022): RTX 40 Series pricing; Wikipedia: GeForce RTX 40 series (memory bandwidth table) |
| GeForce RTX 5090 | 32 GB | 1792 GB/s | $1,999 | NVIDIA: GeForce RTX 5090 specs; NVIDIA Newsroom (Jan 2025): RTX 5090/5080/5070 Ti/5070 pricing; Wikipedia: GeForce RTX 50 series (memory bandwidth table) |
VRAM and bus width from NVIDIA spec pages; bandwidth from Wikipedia series tables (not listed on NVIDIA pages); MSRPs from NVIDIA press releases. Current street prices: TBD.
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