gigabyte is known to stick fairly close to reference designs. this is part of why they're so popular with the hackintosh community. XFX however likes to put custom roms on their cards for overclocks, tweaks etc. Ive heard of people with troublesome XFX cards having luck with reflashes (like putting stock 280X rom on their "black edition" 280X) , but, you're really going down a rabbit hole there. better to just go with what works (which is a shame, because XFX makes some IMO really good looking cards, whereas Gigabyte's stuff frequently looks like it was designed by a 13 year old hopped up on caffeine and pop rocks