a. The C7X58 supports XMP Ready DDR3 Un-Buffered memory up to 1600 MHz, but with only 3 DIMMs maximum, 1 DIMM per channel.
b. Both X8SAX and C7X58 can support the Bloomfield processors up to 1333 MHz in all 6 DIMM sockets.
c. The X8SAX and C7X58 memory bus speed is determined by the Nehalem-EP processors, based on the QPI link speed and number of DIMMs installed. For detailed information, please refer to the Intel web site and the product brief at: