Compare ThinkStation P920 vs ThinkStation P520 vs HP Z4 G4

55 L

33 L

2x FCLGA3647

FCLGA2066

3x Flex bays with optical drive, SATA, I/O, or removable M.2 SSD options + 2x M.2 onboard + 7x via M.2 to PCIe adapter + 6x 3.5" (4 optional, 2 via Flex bay)

2x Optical drives / 1x optical drive + 2x 3.5" SATA / 2x M.2 SSD removable drive enclosures / other I/O ports + 2x M.2 onboard + 7x via M.2 to PCIe adapter + 6x 3.5" (4 via Flex bay)

2x M.2 PCIe 3.0 x4 + 1x PCIe 3.0 x16

5x PCIe 3.0 x16 + 3x PCIe 3.0 x4

2x PCIe 3.0 x16 + 1x PCIe 3.0 x8 + 2x PCIe 3.0 x4 + 1x PCI

[Front] 4x USB 3.1 Gen1 + 2x USB 2.0 + 2x PS/2 + 2x RJ45 (1Gbps) + 1x Microphone + 1x Line-in + 1x Line-out + 2x optional USB-C 3.1 Gen2 + 1x optional Thunderbolt + 1x optional serial | [Rear] 4x USB 3.1 Gen1 + 1x Audio combo + 1x optional SD card reader

[Front] 4x USB 3.1 Gen1 + 2x USB 2.0 + 2x PS/2 + 1x RJ45 (1Gbps) + 1x Microphone + 1x Line-in + 1x Line-out + 2x optional USB-C 3.1 Gen2 + 1x optional Thunderbolt 3 + 1x serial | [Rear] 4x USB-C 3.1 Gen1 + 1x Headphone + 1x Microphone + 1x SD card reader

[Front] 2x Audio + 2x PS/2 + 1x Serial + 2x RJ-45 1Gb + 6x USB 3.1 Gen1 | [Rear] 1x Headphone + 2x USB-C 3.1 Gen2 + 2x USB 3.1 Gen1

WiFi 5 + Bluetooth 4.2 / none

WiFi 5 + Bluetooth 4.2 / none

WiFi 6 + Bluetooth 5

Black

Black

ATX desktop computer

ATX desktop computer

ATX desktop computer

620 mm / 24.4"

460 mm / 18.1"

386 cm / 15.2 inch

446 mm / 17.6"

440 mm / 17.3"

445 mm / 17.5 inch

200 mm / 7.87"

165 mm / 6.5"

169 mm / 6.65 inch

37 kg / 81.6 lbs

24 kg / 52.91 lbs

From 22.4 lbs / 10.2 kg

High Definition (HD) Audio, Realtek ALC662 codec

High Definition (HD) Audio, Realtek ALC662 codec

Intel C621 chipset

Intel C422 chipset

Intel C422 or X299

NVIDIA NVS 810 4GB DDR3 / Quadro P400 2GB GDDR5 to P6000 24GB GDDR5X / RTX 4000 8GB GDDR6 to RTX 8000 48GB GDDR6 / GP100 16GB HBM2 / GV100 32GB HBM26

NVIDIA NVS 810 4GB DDR3 / Quadro P400 2GB GDDR5 to P5000 16GB GDDR5X / Quadro RTX 4000 8GB GDDR6 to RTX 8000 48GB GDDR6 / Quadro GP100 16GB HBM2 / Quadro GV100 32GB HBM2

AMD Radeon Pro WX 3100 4GB, WX 3200 4GB, W 5500 8GB, W 5700 8GB, WX 7100 8GB, or WX 9100 16GB or NVIDIA Quadro P400 2GB, P620 2GB, P1000 4GB, P2200 5GB, RTX 4000 8GB, RTX 5000 16GB, RTX 6000 24GB, RTX 8000 48GB, or GV100 32GB

Optional PCIe dual Gb or dual 10Gb Networking

Windows 10 Pro, Ubuntu, or none

Windows 10 Pro, Ubuntu, or none

Windows 10 Pro

10⁰ C to 35⁰ C

10⁰ C to 35⁰ C

Optional 9mm optical drive (DVD-ROM, DVD±RW, or Blu-ray)

Optional 9mm optical drive (DVD-ROM, DVD±RW, or Blu-ray)

Optional DVD-ROM, DVD-RW, or Blu-ray Writer + Optional 2nd DVD Writer or Blu-ray Writer

Up to 2x 205W Intel Xeon Scalable CPUs Bronze, Silver, Gold, or Platinum

Intel Xeon W-2100 or W-2200 series processors (up to Xeon W-2295)

Intel Core i9-10900X, i9-10920X, i9-10940X, or i9-10980XE or Intel Xeon W-2123, W-2223, W-2125, W-2225, W-2235, W-2133, W-2245, W-2255, W-2265, W-2275, or W-2295

Discrete TPM 2.0, TCG certified

Discrete TPM 2.0, TCG certified

HP Solenoid Lock/Hood Sensor (TWR), Convert TPM to 1.2

16x DIMMs, up to 1TB DDR4-2666 LRDIMM / DDR4-2933 RDIMM or 512GB DDR4-2666 RDIMM, 12 channels (6 channels per CPU)

8x DIMMs, up to 256GB DDR4-2666 w/ Xeon W-2100 series or up to 512GB DDR4-2933 w/ Xeon W-2200 series, 4 channels

Up to 512 GB with ECC (8x DIMMs)

DDR4 2666MHz LRDIMM or RDIMM or 2933MHz RDIMM ECC

DDR4 2666MHz or 2933MHz ECC

DDR4 2666MHz or 2933MHz

1400 W 80 PLUS Platinum

690W / 900W / 1000W 80 PLUS Platinum

465W, 750W, or 1000W

Up to 9x M.2 PCIe SSD + 6x 3.5" / 10x 2.5" SATA HDD

Up to 9x M.2 PCIe SSD + 1x PCIe AIC SSD + 6x SATA HDD

Up to 480GB Intel Optane PCIe SSD + 4x PCIe internal storage + 2x M.2 storage + 4x 3.5" HDD/SSD + Removable internal storage

2020

2020

2020