This mainboard supports the Socket AM2+ / AM2 processors: AMD Phenom™ FX / Phenom / Athlon 64 FX / Athlon 64 X2 Dual-Core / Athlon X2 Dual-Core / Athlon 64 / Sempron processor up to 140W processor. With the new SB750, the board supports AMD OverDrive™ with ACC feature (Advanced Clock Calibration). It comes with 4 DIMM slots supporting DDR2 1066/800/667/533 non-ECC, un-buffered memory of up to 8GB MAX
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source: ocworkbench.com