Really struggled to get this. ASROCK board BIOS is HORRIBLE. I had to enter the settings in via a "certain order" to get them to "take". Entering the exact same combination of settings in a different order & system wouldn't even boot past a BUS of 270Mhz. Order was: 1. Manually set memory timings 2. Manually set lowest memory frequency (don't touch memory after this) 3. Gradually raise Bclk 4. Gradually lower multipliers for NorthBridge & HT 5. Repeat steps 3 & 4. 6. Got Windows...