The specs call for Intel Core 2 Duo, Intel Core 2 Quad, Intel Celeron D 4XX, Intel Pentium Dual Core which none have a 533MHZ FSB.
The ram spec for the board is DDR2 667/800 while PC2 4200 is DDR2 533.
Slower components are not necessarily backward compatible with this board. Best to respect the manufacturers specs and follow their guidelines.