Hey guys i have a XFX GTS250 512MB with me now and I have a few questions.

1.If I were to SLI it with another GTS250 do I have to get the same 512MB model or I can opt with the 1GB model?

2.My current motherboard is a Intel DP55WB motherboard. The Intel webpage said it's SLI capable but my GTS250 is a huge a** card and it looks kinda tight fitting if I SLI it.

Help? Thanks!