Hi all, I am finally going to be setting myself up with a crossfire system. I have most of the hardware I will be using as I am just upgrading my current box. Currently I have a HIS HD4850 512mb and I have my sights set on a second HD4850. My question is, if I were to get a HD4850 with 1Gb RAM for my new card, would there be any noticable benefit over getting a second HD4850 with only 512mb considering I already have a 512mb card and the 1Gb cards are around $40-50 more expensive? Or would it just operate at the capabilities of a 512mb card? Any input is appreciated, cheers!