i've run my 40gb ibm60gxp, from both the tx2 controller and now on my new board(k7s5a). highest burst i got on the tx2 was 64mb. highest i've gotten from the onboard controller was 56mb. sustained rates, the tx2 is a tad faster at 41-42mb/s, while the onboard ranges about 39-40mb/s. and also, the only boards that are out now running 64bit pci slots are tyan's boards and some serverworks boards, so for the average user, there isn't really any way to take FULL advantage of the card at this point.