mo0a :
gtx 550ti not low profile?
After a quick search on Newegg, I'd say no(Same for HD7770, btw).
The gtx550ti has a 116w tdp, so it need a bigger and better heatsink/fan combo to get rid
of all the heat it produces at full bore. Most of the ones on Newegg are full height, dual
slot cards with blower style fans that push hot air out the back of the case. One Gigabyte card has 2 fans and no vents. There's also an asus card with a big cooler but no vents.
HD7770s(80w tdp) are mostly the same, with just a few that are dual fan and venting.