Nvidias actually been quite problematic with both the 6 and 7 series chipsets with PT.
I beleive the FW card is on the Digi approved list also. It's the ADS PYRO 1394 PCIEXPRESS model API-316. I got mine at MicroCenter.
I need to point out one thing. The higher end ASUS boards like this that have the full complement of 6 DIMM slots have a issue while launching PT LE with firewire interfaces while running XP Pro x64 (you need to pull a stick of RAM in order to get PT to launch). I suspect that this will take a BIOS fix by ASUS. The USB interfaces work just fine with XP Pro x64. I would like to point out that this is not a factor using the Digi approved 32 bit operating systems. I will be trying to talk to ASUS tech support about this Monday and make them aware of the issue.
The Gigabyte X58 UD3R works just fine with PT, Firewire and XP Pro x64 along with the ASUS P5K Deluxe, the Intel IDG45IG and the ASUS P5Q SE2. So the issue mentioned above seems limited to the 6 DIMM slot ASUS boards like the P6T and the Revo.
So far the i7 stuff seems to working pretty well on the LE side. And the RTAS numbers at the lowest buffer settings are just stupid.
I'm assume that it would run HD PCIe just fine but have no way of testing it.
This board has lot going for it. Built in SAS for streaming video. The ability to run HD5 PCIe Accel. Room for multiple high end video cards if your work involved using programs that could offload rendering to the GPU's. You could even run a PCIe UAD card
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With the exception I mentioned above I am stoked about this board.