RTX A4000

The RTX A4000 is NVIDIA’s Ampere-generation workstation card optimised for density: single-slot blower cooler, 140 W TDP, 16 GB of ECC GDDR6. Launched April 2021, it shares Ampere’s compute lineage with the 3090 — same tensor-core generation, same FP16/INT8 throughput per CUDA core — but in a form factor that lets you cram 4–7 cards into a single workstation chassis.

Who it’s for: Hashcenter builders who need multi-GPU density without datacenter cards. Four A4000s in a Threadripper workstation = 64 GB VRAM in a quiet, thermally sane package. Also popular in rack deployments where blower airflow matters.

Models it runs comfortably: single card handles Llama 3 8B at FP16, 14B at Q8, 32B at Q4 (tight). Two cards split a 70B at Q4.

Hashcenter notes: ECC memory is a genuine advantage for long-running inference workloads where bit-flips are a silent failure mode. Blower cooler is noticeably quieter than consumer 3090 blowers because the 140 W TDP keeps fan RPM lower. Used prices \$600–900 as of 2026. 140 W each means four cards on a single 120V/15A circuit is very comfortable. Credit to NVIDIA’s workstation team for a genuinely pleb-friendly dense-compute card.

Further reading: This card is a core component of a pleb-grade AI Hashcenter. Pair it with the sovereignty argument in the Sovereign AI for Bitcoiners Manifesto, or look at how the same 120V envelope powers a Bitcoin space heater in our mining catalog. Running both workloads on one rig? See Heating Your Home With Inference.