Tried the K80 in Leandra.
No dice. Mainboard was returning an error 99 (memory and CPU problem).
Remove K80: She boots up fine.
Pretty sure it's the power supply. 900 watts. Fixable with an upgrade but I think it's going to need to wait until the next time I get paid.
Does anybody know off the top of their head if it's possibly to determine how much power a Linux box is using? I know that Leandra is drawing no more than 900 watts of power, but I don't know how much she's using. I'd prefer to figure things out before I threw more money at this project.