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About your SE7221BA1-E

184-pin DIMM Banking:
Not Supported
240-pin DDR2 DIMM Banking:
4 (2 banks of 2)
Max Registered DDR2 SDRAM:
Not Supported
Max Registered DDR SDRAM:
Not Supported
Max Unbuffered DDR2 SDRAM:
Max Unbuffered DDR SDRAM:
Not Supported

Good news!

Crucial has some great SATA drives that fit your system.