I plan to order a second GTX 680 within the next few days. However, I just need to be certain there's not going to be any issues pairing it with my current PNY card, given it's quite an uncommon brand. The new card I will order is most likely going to be MSI. Now I gather that there shouldn't be any problem with matching two different brand cards, but I came across a source online that states that the PNY GTX 680 has different measurements than the standard.. I don't know how accurate this source is, it seemed to be merely speculation but I want to be sure (can't find the box). Does anyone know if this is even possible or do all cards have to stick to the reference design (dimensions wise)? And will this prevent me from being able to SLI them? Thanks.