when I first install this card into a HP Workstation x4000 it do not work . I then contact evga support . they do not have any information on this system but do offer a few suggestion that I try and do not work . I then start the return proceedure with Amazon which be straight forward . but prior to send the card back I get hold of another identical system and try the card in it and it work . so , back to my system again . after a few day of testing I find that the video card be take resource from the memory . I find that the system would fail if I have any more than 2.5 gb of memory -lrb- 4-512mb & 2-256mb be all that would work -rrb- . so far the card be work fine . I guess this be just one of those problem you incounter with these old workstation .