HP's Z workstations come in two families that are easy to confuse. The older ones, the Z240, Z440, Z640 and Z840, use Intel Xeon E3 or E5 processors. The newer Z4, Z6 and Z8 G4 use Intel Xeon W or Xeon Scalable processors, and the Z2 Mini is a small desktop. The right pick depends on what you run: single-thread speed for modelling, many cores for rendering, memory for simulation, or small size for a desk. This guide compares them using the specifications on Serverwale's product pages and lists what to check before you pay for a refurbished workstation.
| Model | Processor family | Sockets | Memory |
|---|---|---|---|
| Z2 Mini G3 | Intel Core i3/i5/i7 or Xeon E3-1200 v6 | 1, ultra-compact | DDR4 SO-DIMM, up to 32 GB |
| Z240 | Intel Xeon E3-1200 v5/v6 or 6th/7th gen Core | 1 (LGA1151) | DDR4 ECC or non-ECC, 4 slots |
| Z440 | Intel Xeon E5-1600 v3/v4 or E5-2600 v3/v4 | 1 (LGA2011-3) | DDR4 ECC RDIMM |
| Z640 | Intel Xeon E5-1600 or E5-2600 v3/v4 | 1 or 2, up to 44 cores total | DDR4 RDIMM / LRDIMM |
| Z840 | Intel Xeon E5-2600 v3/v4 | 2 | DDR4 ECC, 16 slots (8 per CPU) |
| Z4 G4 | Intel Xeon W-2100 / W-2200 or Core X | 1 (LGA2066) | DDR4 ECC RDIMM, 8 slots, up to 256 GB |
| Z6 G4 | Intel Xeon Scalable | 2 (LGA3647) | DDR4 ECC RDIMM, 12 slots, up to 384 GB |
| Z8 G4 | Intel Xeon Scalable | 2 (LGA3647) | DDR4 ECC RDIMM, 24 slots, up to 3 TB |
Maximum memory and storage depend on the configuration of the individual unit, so confirm them for the exact machine you are buying.
| Workload | Sensible choice | Why |
|---|---|---|
| 2D drawing and light 3D modelling | Z240 or Z2 Mini | Modelling leans on single-thread speed; a single-socket machine is enough and cheapest |
| CAD, BIM and heavier 3D with a pro graphics card | Z440 or Z4 G4 | More memory and PCIe room than a Z240, still a single processor |
| Rendering and simulation that use many cores | Z640, Z840 or Z6 G4 | Two processors give more cores and more memory |
| Big memory or several GPUs | Z8 G4 (or Z840) | Most memory slots and expansion room in the range |
| Small desk or reception area | Z2 Mini G3 | Ultra-compact, but limited to SO-DIMM memory and light workloads |
The Z240 to Z840 are the budget route and are still used for CAD, editing and rendering. The G4 models (Z4, Z6, Z8) are newer, use Xeon W or Xeon Scalable processors and support more memory. A Z840 gives you many cores on the older platform, while a Z4 G4 gives a newer single-socket platform and a Z8 G4 newer dual-socket processors. If you are comparing a workstation with a server, our workstations for rendering guide and the Xeon vs EPYC note explain where each fits, and Intel Xeon processor prices help you judge upgrades.
Serverwale's Z240 page lists DDR4 ECC or non-ECC memory depending on the processor, while the Z440, Z640, Z840 and the G4 models take ECC registered memory. ECC corrects single-bit errors and suits long renders and simulations where one bad bit could ruin hours of work. Read the RAM buying guide and the DDR4 price guide before you upgrade.
For a render deadline or a short AI project, renting can be cheaper than owning. Serverwale lists rentals such as the HP Z440 and Z640, and the HP and Dell workstation rental guide explains the terms. Our rent vs buy a GPU workstation guide gives a break-even method, and a studio doing steady work may prefer a render farm approach.
Which HP Z workstation is best for CAD? For CAD and moderate 3D, a single-socket Z440 or Z4 G4 with a professional graphics card is usually enough because modelling relies on single-thread speed. Choose a dual-socket model only if you also render or simulate.
What is the difference between the HP Z440, Z640 and Z840? The Z440 is single-socket. The Z640 takes one or two Xeon E5 processors (up to 44 cores in total according to Serverwale's listing), and the Z840 is a dual-socket model with 16 memory slots. All use DDR4 ECC memory.
Are the HP Z4, Z6 and Z8 G4 newer than the Z840? Yes. The G4 models use Intel Xeon W (Z4) or Xeon Scalable (Z6, Z8) processors and support more memory than the older Z240 to Z840 range.
Does the HP Z240 support ECC memory? Serverwale's Z240 page lists DDR4 ECC or non-ECC memory, depending on the processor fitted. Check the processor in the exact unit.
Can I rent an HP Z workstation instead of buying? Yes. Serverwale lists rental options such as the HP Z440 and Z640. Renting suits render deadlines, short AI projects and temporary teams.
What warranty comes with a refurbished workstation from Serverwale? Serverwale states a 1-year hardware warranty on its hardware. Confirm the exact coverage and terms in writing before you order.
Tell us your workload, budget and quantity, and we will suggest the right model and quote it. Serverwale · Phone +91-87962-44410 · WhatsApp https://wa.me/918796244410 · Burari, Delhi 110084, India. See enterprise solutions, browse live stock or server AMC plans.
Sources: Serverwale product pages for the HP Z240, Z440, Z640, Z840, Z4 G4, Z6 G4, Z8 G4 and Z2 Mini G3. Specifications vary by unit; confirm them before buying. No prices are quoted here because prices change with configuration and stock.