I'am using a 560 right now to give me 1.904 I can only run DC @ about 205, single channel I can run 215 100% stable. But I also have lapped the NB , put iceberg cooler on NB, passive sinks on mosfet and SB, also added a little sink to the chip above the mosfet.
What do you have your vddim set to? What dimm slot are you using?