Hi, new poster to this site. I'm trying to get one last hurrah out of my Socket 939 system (shown in my profile) before a motherboard upgrade, and am planning on doing this by getting a pair of these cards and putting them in crossfire: http://extreme-pc.ca/showproduct.asp?productid=371414&menu1id=12&menu2id=99&menu3id=39 Of course, considering I'm pretty much bound by the finest CPU's and RAM of the 939 architecture (which I have), I'm wondering how bad the bottleneck for these cards would be with my good ol' opty 185 and low latency OCZ ram... I'm sure there'll be some, but is it enough to warrant a full upgrade of my motherboard over? How much of a performance increase can I expect from that? Mind you my goal here is to run Oblivion smoothly at max settings, and as it is I'm afraid my uber editions X1950's just aren't cutting it. Thanks in advance, I appreciate it!