I did some more testing with my 4th R8500 under single stage. 600 MHz FSB is only stable enough for the BIOS, booting at 550 MHz works like a charm. Clockgen in windows up to 580-595 MHz depending on the mood of the hardware

I tested my D9GMH from G.Skill with the board. They can run up to 740 MHz single channel, single stick, so I am pretty sure the CPU is the limiting factor here. The board features a lot of BIOS options as shown above. Higher voltages are not always better. In some cases it causes instability, so you have to play a lot with different values in order to find the right combination.

So far, all BIOS options works like they should, which is not always the case with other P45 boards from MSI and Gigabyte that I tried.