• Extremely High-Speed 128Gbps PCIe 3.0 x16 host connectivity
  • Solid metal structure with stylish aluminum housing
  • Dedicated single 1200 watts power supply for GPU usage
  • Two quiet front 120x120x25 mm fan cooling for self-contained ventilation
  • Capable of up to four dual-slot GPU cards
  • Environmental Monitoring with Power/FAN/TEMP LEDs and mutable buzzer alarm


128 Gbps Bandwidth – PCIe Gen3 x 16

The Netstor NA255A GPU enclosure implements the latest in PCIe 3.0 technology and PCIe Gen3 16-lane host interface with throughput 8Gbps per lane, offering blazing-fast data transfer rates up to 128Gbps between host and expansion enclosure, dedicated for GPU-accelerated applications.

Up to 4 Dual-Width GPU Cards

The GPU enclosure is designed to have 4 PCIe x16 slots (x8 electrical) on NA255A backplane supporting up to 4 double-width PCIe Gen3 GPU cards, or single-slot PCIe cards. In addition, the enclosure can accommodate all combinations of PCIe 3.0 ×1, ×4, ×8 and ×16 GPU/PCIe cards for every application with backward compatibility for Gen2 cards to work with host, server or workstation in areas such as HPC, telecom, and data centers.

High Performance Computing

Traditional host computers or workstations use conventional CPU and GPU to work with professional applications. These conventional data processors cannot provide a higher processing power to meet modern working demands. However, by adding the Netstor NA255A GPU enclosure with up to four high-end GPU cards to your host/workstation, you will  turn your conventional host computer into a high-performance computing workstation.

Extra Graphics Card Holders

In view of some high-performance GPU card with card length up to 30 cm or so, due to card’s heavier weight and longer length, a special graphics card holder has been deliberately designed close to each PCIe slot for holding the large, heavy GPU card thoroughly and reliably within the NA255A enclosure.

Convenient Adjustable Fan Speeds

NA255A is equipped with two front large 12×12 cm cooling fan modules with each fan in support of 75 CFM, providing best airflow ventilation to enclosure for most excellent heat dissipation ever, and ensuring graphics cards within chassis can run long term without any high temp concern. Moreover, the fan speed of each cooling fan can be adjusted manually according to GPUs application situation within NA255A GPU chassis.

PCIe Expansion Chassis NA255A-XGPU Product Description

Form Factor Desktop
Host Interface Up to 128Gb/s external PCIe 3.0 x16
No. of Slot 4 x PCI Express 3.0 x8 (x16 connector)
Card Length Available Supports full length,full height PCI Express Cards
LED Display for Enclosure Power-On LED – Blue FAN normal – green; Fan failure – Red TEMP normal – green; TEMP Over 55°C – red
Cooling Front: two 120x120x25 mm cooling fans 75 CFM each fan @ full speed
Alarm Buzzer beeping for fan failure or over temperature (over 55°C) occurs
Material Solid metal structure with aluminum housing
Power Supply Model : NA255A-XGPU Universal Single 1200W (High-Efficiency & Low Noise) Input: 90~230 VAC/50-60 HZ 12V @ 100A (Note: 1300W peak power @ 12 seconds)
Dimension 450 (D) x 175.8 (W) x 374 (H) mm 17.7 (D) x 6.9 (W) x 14.7 (H) inch
O.S. support OS Independent
Host Requirement One PCIe 3.0 x16 slot and system has sufficient PCIe resources Note: 1. The tower MacPro under 10.9 Mavericks and 10.10 Yosemite only supports up to 2 nVidia GPU cards. 2. Now the tower MacPro under 10.11 El Capitan is able to support up to 3 nVidia GPU cards again.

Enclosure x 1 PCIe 3.0 x16 host adapter with full height bracket x 1 PCIe 3.0 x16 target board for upstream port x 1 (Installed into NA255A) PCIe 3.0 x8 cable(1.5 meter) x2 Power Cord x 1 CD User Manual x 1

Model No. Description
NA255A-XGPU Desktop PCIe Gen3 Expansion Enclosure, 1200W Single Power Supply with extra 4* PCIe power connectors 6+2 pin & 4* PCIe 6 pin for up to 4 double width GPU cards, with one PCIe Gen3 x16 host adapter and two PCIe x8 cables
NP970A Extra PCIe Gen3 x16 Host Adapter


Extra PCIe 3.0 x8 cable length in 1.5 meter

Can the NA255A support up to 4 GPU cards?

The NA255A hardware can support up to 4 pcs GPU cards but the BIOS on some manufacturer’s motherboards were not designed This means that hardware will not be issue but the motherboard firmware is more likely to be the cause of a problem if it arises. From our records, only some ASUS motherboards will not work up to 4 GPU cards. Check with your motherboard’s manufacturer for further details regarding compatibility.

What if my MSI™ Z270 gaming motherboard doesn't recognize the NA255A?

The solution is as follows:

  1. Visit the MSI BIOS Download Page to download and update your MSI Z270 Gaming MoBo to the latest BIOS version 7A58v12 released on April 11, 2017.
  1. First, make sure to not have any card installed in slot 2, slot 3, and slot 4 on the MSI motherboard before proceeding.
  1. Install NA255A host card on MSI’s motherboard’s PCIe slot 1 for signal of electrically x16
  1. Connect the monitor to MSI motherboard’s onboard HDMI interface for screen output (see attached image file) so the monitor will utilize Intel Core i3-7100’s integrated HD Graphics 630 processor. In MSI’s MoBo BIOS settings, set i3-7100 integrated HD Graphics 630 as the top priority screen output processor.
  1. Power on your PC, and then the NA255A will be powered on along automatically. When the  Pc boots into Windows 10, the GTX 1080 gpu cards in NA255A will be recognized by WIN10’s Device Manager correctly.