|"i got it on ebay ,new in box nice huh"|
I'd be suspicious of a $140-160 card that's supposedly "new in the box" for just $80...especially on eBay. Did you check the seller's rating? I hope it works out but it sounds almost too good to be true.
I don't think you'll need to be concerned about clearance with the memory slots. You'll probably end up with about 1/2" between the back of the video card & memory. It *may* be a little tight getting the RAM in/out once the card is in place though. If there are any clearance problems, it would more likely be due to the length of the card or the fact that it's "thick" & takes up 2 slots, so there *may* be a problem clearing the southbridge heatsink.