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Head-to-head · Best AI Workstations

HP Z6 G5 A vs Puget Systems Genesis II

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Puget Systems Genesis II comes out ahead by a narrow margin (4.5 vs 4.7). The gap is mostly about Best for enterprise — multi-GPU training and inference — read the strengths below before deciding.

HP Z6 G5 A
Ranked #3 in Best AI Workstations
HP Z6 G5 A
$5,499as of Apr 25

The HP Z6 G5 A is the smallest Threadripper Pro OEM workstation on the market and the rational mid-tier pick under HP's flagship Z8 Fury G5. Reviewers across PCMag, AnandTech, StorageReview, Phoronix, and DEVELOP3D consistently praised its build quality, toolless serviceability, and 96-core CPU ceiling — StorageReview gave it their 'highest recommendation for a high-end tower workstation.' For local-LLM use, configurations with 1–3 RTX 6000 Ada GPUs (48 GB VRAM each at ~960 GB/s) deliver in the 25–40 tokens/sec range on Llama-3-70B Q4 single-GPU and substantially more with multi-GPU tensor parallelism. Note that none of the published professional reviews ran formal Llama-3 70B Q4 benchmarks, so LLM-specific performance numbers here are from single-GPU norms rather than published HP Z6 measurements specifically.

Strengths
  • — Smallest Threadripper Pro OEM tower on the market — compact 4U chassis with built-in handle
  • — AMD Ryzen Threadripper Pro 7000 WX-Series scales from 12 to 96 cores at the same chassis price floor
  • — Toolless serviceability, modular interior, ECC DDR5 — enterprise pedigree at mid-tier pricing
Watch-outs
  • — 95°C all-core CPU thermals reported under sustained load (StorageReview)
  • — Pricing scales steeply — 96-core configs push $18,000+
  • — No published Llama 70B Q4 tokens/sec figures in mainstream reviews — LLM-specific benchmarking is thin
$5,499 · Buy at hp.comFull review →
Puget Systems Genesis II
Higher ratedRanked #1 in Best AI Workstations
Puget Systems Genesis II
$10,569as of Apr 25

The Puget Systems Genesis II is a highly customizable, professionally built workstation aimed at enterprise buyers who need bespoke configurations the major OEMs can't match. With AMD Threadripper Pro, up to 4x RTX 4090 (or RTX Ada workstation cards), 256 GB ECC DDR4, and Puget's hand-tuned assembly process, it delivers exceptional performance and build quality with options for a quiet edition. For local LLM work specifically, a single RTX 4090 (24 GB VRAM at 1008 GB/s) handles 70B Q4 with system-RAM offload at roughly 10–20 tokens/sec; a 4x RTX 4090 configuration pools 96 GB of VRAM and easily holds 70B Q4 in VRAM at 30–40 tokens/sec via tensor parallelism. The steep entry price makes this a tool for buyers who can justify a $10K+ workstation — if you only need local LLMs, the DGX Spark below delivers comparable model-size headroom at less than half the price.

Strengths
  • — Highly customizable with a wide assortment of mainstream and pro-channel components like Nvidia Ada workstation GPUs
  • — Serious professional build quality with careful component selection and assembly
  • — Exceptional customer experience including an easy-to-use configuration tool with detailed component comments
Watch-outs
  • — Extremely expensive, with review units costing over $10,000 and configurations reaching nearly $61,000
  • — Configurations with 4x RTX 4090 lose the NVLink that would have helped tensor-parallel LLM inference
  • — Price can be prohibitive compared to a DGX Spark or HP Z6 G5 A for buyers whose only need is local LLMs
$10,569 · Buy at pugetsystems.comFull review →

How they stack up

HP Z6 G5 A

The HP Z6 G5 A is the mid-tier sweet spot in this lineup. Versus the HP Z8 Fury G5 (its flagship sibling), it's a smaller chassis with the same Threadripper Pro CPU family at a noticeably lower entry price — trading the Z8's 4-GPU ceiling for a 3-GPU ceiling and a more desk-friendly footprint. Versus the Puget Genesis II, it offers similar build pedigree without Puget's bespoke configurator and handpicked components, at a meaningfully lower starting price. Versus the DGX Spark, it's a different class of machine — the HP Z6 G5 A is a multi-GPU general workstation, the Spark is a single-purpose 128 GB unified-memory dev box. Pick the HP Z6 G5 A when you need both AI horsepower and traditional workstation workloads (rendering, simulation, multi-app productivity) on the same machine.

Puget Systems Genesis II

The Puget Systems Genesis II is the enterprise pick. Versus the HP Z8 Fury G5, it offers comparable scale-up capability but in a quieter chassis with a more thoughtful configurator. Versus the HP Z6 G5 A, it's two tiers up in price and ceiling. Versus the NVIDIA DGX Spark, it's a different class of machine entirely — the DGX Spark is a 128 GB unified-memory dev box, the Genesis II is a multi-GPU training/inference workstation. For buyers whose only goal is running large local LLMs, the DGX Spark is the more cost-effective answer; the Genesis II earns its premium when training, fine-tuning, or multi-application workstation duty are part of the picture.

Specs side-by-side

SpecHP Z6 G5 APuget Systems Genesis II
CPUAMD Ryzen Threadripper Pro 7000 WX-Series (12–96 cores)AMD Threadripper Pro 5975WX (32-core)
GPUUp to 3x dual-height pro GPUs (RTX A6000, RTX 6000 Ada)Up to 4x Nvidia RTX 4090 (96 GB pooled VRAM)
RAMUp to 1 TB DDR5-5600 ECC (8 channels)256 GB DDR4-3200 ECC
StorageHP Z Turbo NVMe (multiple M.2 + bays)4 TB Sabrent Rocket 4 Plus NVMe
Memory Bandwidth~358 GB/s system; ~960 GB/s per RTX 6000 Ada VRAM~76 GB/s system; ~1008 GB/s per RTX 4090 VRAM
Form FactorCompact 4U tower (169 x 465 x 445 mm, built-in handle)Full tower (Fractal Define 7)
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