Hi there, pleased to report that the MSI R9 280 3G Twin Frozr does indeed fit the AIR 240 BUT, it was a really tight squeeze getting the card it. I tried for 15 minutes approaching the PCI-e slot from all sorts of angles but each time the PCB kept jamming on the case on the back right corner( where the latch is located). So how did I get the card in? I simply removed the mobo, installed the card then re-installed the mobo and card at the same time. The PCI-e 6pin and 8 pin kinda touch the glass on the side panel but it was still quite easy to get the side panel on and this doesn't bother me. If there are any measurements you would like then just ask.