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Apple · M5 Ultra · 256 GB · Qwen3.8 27B · Q4_K_M: ~42 tok/s

Apple Mac Studio M5 Ultra, 256 GB

The fastest unified memory in a desktop: 1.2 TB/s, half again the M3 Ultra's, plus neural accelerators in the GPU that close much of the gap on prompt processing that held earlier Macs back. 256 GB runs the large mixture-of-experts models at Q4. A 512 GB version is due later.

Lowest price right now

$13,499

eBay · plus shipping · $52 per GB · observed 2026-10-18 02:55 UTC

Buy the cheapest on eBay, $13,499

plus shipping · New · stevenl512 1,827 · 100.0%

All 3 listings on eBay

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Price history

Tracking started today. The chart appears once there is a second day of data.

Where to buy

VendorPriceConditionObserved
eBay
cheapest active listing		 $13,499
plus shipping		 new and used 2026-10-18 02:55 UTC Go to eBay

On eBay now

3 listings passed our filters at the last check. Cheapest delivered first. Seller reputation is feedback count and positive rate.

What it runs

For each model, grouped by vendor with the newest first: the largest quant that fits with 8K of context and the estimated speed for one user, at 8K and at 32K of context. On a card, a model too big for its memory can still run with part of the weights in system RAM; we assume 64 GB, and the speed shown accounts for it. The model you picked on the ladder is highlighted. Estimates from the spec sheet, not measurements: see how we estimate.

ModelQuantNeeds at 8KFitMax contextDecode at 8KAt 32KPrefill tok/s
DeepSeek
DeepSeek V4.1 Flash 552B-A16B Sep 2026IQ2_M189 GBfits128K+~90~90~1,100
DeepSeek V4 Flash 284B-A13B Jul 2026Q6_K235 GBfits128K+~53~49~1,300
DeepSeek V3.1 671B-A37B Aug 2025IQ2_M230 GBfits128K+~46~41~470
Gemma
Gemma 4 12B May 2026Q8_014 GBfits128K+~56~55~1,500
Gemma 4 31B Mar 2026Q8_035 GBfits128K+~22~20~570
Gemma 4 26B-A4B Mar 2026Q8_028 GBfits128K+~110~100~4,600
Gemma 3 27B Mar 2025Q8_031 GBfits128K+~24~23~640
GLM
GLM-5.3 753B-A40B Aug 2026Q4_K_M462 GBdoes not fit
GLM-5.3 Flash 320B-A18B Aug 2026Q5_K_M229 GBfits128K+~46~43~970
GLM-4.6 355B-A32B Sep 2025Q4_K_M221 GBfits98K~29~21~550
GLM-4.5 Air 106B-A12B Jul 2025Q8_0115 GBfits128K+~43~34~1,500
gpt-oss
gpt-oss-120b Aug 2025Q8_0126 GBfits128K+~84~70~3,400
gpt-oss-20b Aug 2025Q8_024 GBfits128K+~110~91~4,900
Llama
Llama 4 Scout 109B-A17B Apr 2025Q8_0119 GBfits128K+~33~27~1,000
Llama 3.3 70B Dec 2024Q8_079 GBfits128K+~9.3~8.4~250
Llama 3.1 8B Jul 2024Q8_011 GBfits128K+~75~56~2,200
MiMo
MiMo V2.6 Pro 1.02T-A42B Sep 2026Q4_K_M624 GBdoes not fit
MiMo V2.6 Flash 309B-A15B Sep 2026Q6_K255 GBfits39K~48~46~1,200
Mistral
Mistral Medium 3.5 128B Mar 2026Q8_0140 GBfits128K+~5.2~4.9~140
Mistral Small 4 119B-A6.5B Mar 2026Q8_0132 GBfits128K+~51~25~2,700
Mistral Small 3.2 24B Jun 2025Q8_028 GBfits128K+~27~23~730
Nemotron
Nemotron 3.5 Lightning 30B-A3B Aug 2026Q8_035 GBfits128K+~110~110~5,000
Qwen
Qwen3.8 Flash-Next 125B-A6B Aug 2026Q8_0134 GBfits128K+~79~74~2,900
Qwen3.8 27B Aug 2026 (your pick)Q8_031 GBfits128K+~25~23~650
Qwen3.6 27B Apr 2026Q8_031 GBfits128K+~25~23~650
Qwen3.6 35B-A3B Apr 2026Q8_039 GBfits128K+~120~110~5,800
Qwen3.5 9B Feb 2026Q8_011 GBfits128K+~73~68~1,900
Qwen3 Coder 480B-A35B Jul 2025Q3_K_M239 GBfits74K~33~26~500
Qwen3 235B-A22B Jul 2025Q8_0252 GBfits27K~26~800
Qwen3 32B Apr 2025Q8_038 GBfits128K+~20~17~530

Specifications

Memory
256 GB LPDDR5x unified
Memory bandwidth
1,200 GB/s
Bus width
1024-bit
FP16 (dense)
140 TFLOPS
Form factor
Desktop box, 197 x 197 x 95 mm
CPU
36-core CPU, 80-core GPU with neural accelerators (30-core CPU, 64-core GPU on the base chip), 32-core Neural Engine
Architecture
M5 Ultra
Launched
2026
MSRP
$9,499

Source: manufacturer specifications.

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