I have one, I have had a lot of motherboards since I work "in the business" as a PC-Engineer.
I have tried many but this one beats them all. I've gone through Asus A8N-SLI, Asus A8R-MVP lately and this is a better one.
I have reached 312 on HTT and that is pretty high, I have my Opteron 165 at 2.8GHz and my Ballistix at 280 and get ~6600 in 3DMark06 with my single X1900XTX so I state that this motherboard is a good one.
I'm powering it with a Antec NeoPower 480Watt PSU and it works fine.
I'm running "severeal-weeks-stable" setup with 2.6GHz @1.35volt and 260MHz on memory @2.8volt (3-3-3-8 1T)
As for your question about the PCI-e slot.
I use the one closest to CPU but I'm absolutely not sure if this is right or the only way.
I got good 3DMark scores so I'm not off the chart there but it would be interesting to see if it works the same in the lower slot. I canät try myself because I have the waterhoses running through one of the holes in the back (PCI-slot) and that makes it to much of a hassle to change slot.
But perhaps you would do the whole RDX200 community a great favor by testing this.
Because IF IT WOULD WORK it would enable a lot of users to replace the northbridge coler with something else. As it is with the card in the upper slot it is in the way of the chipset. The card in the lower slot would yield some more space.
Please test this and let us know *smile*
a screen of my own record, it might help others with settings and stuff