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OWC Mercury Helios 3S  


New Member
Joined: 1 year ago

Apologies if folks know about this, but it looks like OWC has a new version of the Helios 3 out that looks like it'd be perfect for those who only need a short single or dual-slot 75W card. It ships with a 150W external power supply, and, though it doesn't officially support GPUs, it can supply up to 75W to an attached PCIe card and has a physical x16 slot inside. It also has up to 85W of power delivery, though it looks like that takes a dip if there's a more power-hungry card installed. There could be some firmware limitations we don't know about that keeps it from being useful for an eGPU, but as-is this looks like a big leap forward on the power delivery front from the previous Helios and its AKiTiO counterparts.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.


Noble Member
Joined: 4 years ago

I like the OWC Helios vs the Sonnet Echo Express SE I because it's easier to take apart (two thumbscrews instead of 4 normal screws) and it has DisplayPort. This new S3 version has more power (requires 6 pin power connector instead of barrel connector) and is updated to Titan Ridge. Since it uses Titan Ridge, they could have added a USB port or replaced the DisplayPort with a USB-C with DisplayPort alt mode port. I guess DisplayPort is easier to add than USB (less power required).

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case