So, final update on #IntelArc A380 in #Kubevirt/#Kubernetes.
To put it lightly, the whole thing was a bust. Likely at least partially due to my motherboard (whatever comes with a Dell R730) not supporting resizable bar. To add to that, while Linux will try its best to resize the PCIe BAR even if the BIOS feature isn't enabled, it seems the architecture of the Intel Arc cards blocks this (something to do with the card having a built-in PCIe switch that has its own resizable bar which blocks the actual GPU's bar from being resized... or something?
Everything I've seen online seems to be point to resizable bar being almost a hard requirement for the Arc cards to do any good. So it's perhaps due to not being able to do that that the performance of the card has been absolutely terrible.
#DavinciResolve Studio would barely even run in a Linux VM (which may be as much to do with the vendor than the GPU itself). On Windows the performance was average at best, and the GPU wasn't able to handle rendering to any of the intermediate codecs (like DNxHR or Cineform) without Davinci crashing due to running out of VRAM.
I have parts coming somewhat soon to build a nice tidy 1U server based around the #TopTon #7840HS board, which looks exciting. I'm tempted to pop the GPU in there, but at the same time I'm pretty sure the #780M iGPU actually has better performance than the A380, so I'm probably just going to utilise the iGPU for that.
So might be sending the A380 onto its next (and hopefully Resizable Bar capable) home shortly.