i'd be more than happy to take your 4850 off of your hands :P i'll pay the shipping :P

and, it performs on the same level as the 9800gtx. you had some problems, but those were "driver issues" which i can guarantee are problems on your end.

now, i am not sure how the layout of slots is on your motherboard, i've never heard of an x14 slot in my life... x4 yes, but no x14.
if you could take a well lit picture of the inside of your case so i could see the setup, i could assist you further.
if you're so worried about driver issues, an x2 card is not the best option.
if you only have an x4 slot, you can still put a video card in it, assuming the back end is open and not closed (of the slot) but it will be limited to the speed of pciex4 2.0 (same as pciex8 1.1) not sure what kind of cards bottleneck at that bus speed... a 9800gtx just might, but im not sure by how much if at all.


also, if someone is helping you, i'd appreciate it if you didnt mouth off and call them a "tard" and use gangster talk to convey your thoughts.