I want to use my gt 730 for unraid. This will allow VM passthrough to be easier. gt730 is x1 slot so no matter what I do the OS still picking my high performance x16 slot card

This is controlled by the motherboard. Some boards have the option to change the primary card, some don't.

yes but can the os disable the use of gpu?

If you want a specific GPU not to be used by unRAID OS itself so that you could passthrough it to a VM, you would need to go to MAIN tab and lick on your Flash drive:

From there you would need to change Syslinux Configuration:

The red box is used for a completely headless unRAID, so you might omit that.

The values in the yellow box can be gathered from TOOLS --> System Devices menu:

You might need to fiddle with SETTINGS --> VM Manager (in Advanced mode) --> PCIe ACS override: for a working IOMMU Group configuration.

Note: I have a single GPU in my system, I'm running unRAID as headless and I'm reserving that GPU to be used in a VM.

 

But as @jonathanm mentioned, if you would like to use a dedicated GPU just for unRAID, you must set it up as your primary GPU from your motherboard's BIOS (if that option is there).

 

P.S: There might other workarounds, but this is all I can provide.

Edited December 20, 20205 yr by UNOPARATOR