barnsley
born in a.....
If they do it'll probably suck.
booooooom, PUNishing
That said, I'm sure that someone will make one as it'll keep the cost down for people who want to block 'em. Just don't expect decent performance. To be honest, as long as you've got a decent airflow and spacing the Sapphire cards seem to be OK in crossfire. My friend runs two overclocked 280X Toxic in a AIR 540 case and his temperatures are not bad.
