What memory does the 1GB NVIDIA GeForce 9800GT video card use? Is it GDDR2 or GDDR3? I've seen several video card in the past go with slower memory when the amount of memory is doubled on them. Thoughts? Also, is this video card supposed to be quicker than the 8800GT, or it just a rebadge? Should I hold out an wait to see the HD 4870 first before pulling the trigger on this new computer?