The Razer Core X must be extremely popular because I couldn't find it anywhere in stock. I needed an enclosure asap so I just ordered the Sonnet 350W version, paired with the Sapphire Vega 56.
The Vega 56 is not supported by the 350W version according to Sonnet's GPU compatibility page and FAQ. They steer customers toward the more expensive 550W option. However, multiple sources have confirmed it working with the 350W version. I'm unsure why Sonnet says that the 350W version cannot be used with the Vega 56, because Sonnet lists it as being able to support up to a 300W GPU and the Vega 56 draws less than 200W (the one I purchased is rated at 180W).
Interestingly, for my use case, I find the 350W more upgradeable than the 550W version, because the 550W version reserves more watts (85W vs 15W) for power delivery for charging laptops and such, siphoning those watts away from potentially powering the GPU. I have no need for it because I won't be charging anything with it and would be happier if everything went to the GPU.
I read that the Vega 56 cards can be flashed to the Vega 64 firmware. If I do this, there is the option of switching out the PSU with a more powerful one to support the extra power requirement.
I also needed a speedy external SSD for Windows. I said what the heck, closed my eyes and just went for the 1TB Samsung X5 for the extra boost and TRIM support (not supported via USB). I'll be running part of it as both the boot drive for Windows and for apps / games / files. There is also the added bonus that the X5 being Thunderbolt 3 won't have the CPU overhead of a USB drive, though I have no idea if this has any measurable impact. But I'll take it.
Hopefully, this will be the answer to my performance woes.
