Who said anything about needing a single slot card? There are single slot HD5770s available but I have no idea why you bring it up as it's a fairly rare requirement that certainly shouldn't be assumed. Even if you want to take "everything" into account cases that need a low profile cards are significantly more common than ones that need a single slot card. Ignoring the possibilities of a non-standard case the better question would be about his power supply.yes but can he fit a dual slot card in his unit.
the hd5770 is now in single slot card but is it available yet.?
take into account everything, not just a better performing card.
all I'm saying.
^+1
all you need is 512mb version