While we agree the ATX form factor makes swapping the PSU a breeze, the selling point of this eGPU enclosure is that its the most affordable, ready-to-go solution on the market.

Yet theyre a foreign concept for the majority of computer users.

Weve seen this time and time again with new and developing technologies.

One major indicator of mainstream adoption is key player participation.

With Apples official support of external GPU in macOS High Sierra and HPs entry to the Thunderbolt 3 external graphics enclosure market, we believe its primetime for eGPU.

According to the specifications on the OMEN by HP GA1-1000 Accelerator Shell product page, the dimensions are 15.75 x 7.87 x 7.87 in (400 x 200 x 200 mm).

We decided to measure the tallest point to the bottom of the feet and side to side.

In real-world use, the dimensions are 15.75 x 10.5 x 10.75 in (400 x 267 x 273 mm).

Therefore, the OMEN Accelerator currently holds the title for the largest Thunderbolt 3 eGPU enclosure footprint.

Between the inner metal cage and outer plastic shell, theres not a whole lot of airflow through these vents.

Seen from the outside, cutouts on the plastic shell give an illusion of sufficient cool air intake.

Vent holes on the inner metal cage significantly reduce the opening surface for airflow.

The rear IO are 4x standard USB ports, 1x USB-C port and 1x Ethernet port.

Inside the enclosure HP has a neat solution for connecting the SATA drive by using a single flex cable to handle both data and power.

This cable is rather fragile so take special care when mountingunmounting the SATA drive so not to damage it.

On this main board, we spotted the familiar components of a Thunderbolt 3 eGPU enclosure: TI83 USB-C controller, DSL6540 Thunderbolt 3 controller, and Winbond chipset.

Its confusing though because if HPs aim was to provide an affordable eGPU enclosure, it could have kept the design simpler and used many fewer parts.

In return HP could sell the OMEN Accelerator for an even lower price.

Such arrangement provides a lot more airflow and much easier access to internal components.

The plastic shell and legs add no value other than extending the current OMEN design language.

Another strike against the plastic shell is the way the top cover operates.

The lever is flimsy, and the cover lacks the substantial weight to fully sit in alignment with the bottom shell when closing.

Its the only Thunderbolt 3 eGPU enclosure to use a standard-size ATX PSU.

Its massive compared to SFX and custom mATX power supplies in other enclosures weve reviewed.

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