Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Unlike its AMD Athlon 64 sibling, the Intel Edition is an older chipset as it has both a northbridge and southbridge. As with the older nForce2 chipsets, Nvidia calls the northbridge the "System Platform Processor" (SPP) and the southbridge the "Media and Communications Processor" (MCP). This change in design was necessitated because, unlike the Athlon 64/Opteron, the Pentium 4 does not have an on-board memory controller thus requiring Nvidia to include one in the chipset like in older nForce2. In addition to supporting Pentium 4 processors (with up to a 1066 MHz FSB) the chipset includes support for DDR2 SDRAM. Also like Nvidia''s older chipsets, the MCP and SPP communicate through a Hypertransport link, in this case only at (1.6 GB/s. transfer rate) Apart from these differences, the nForce4 SLI Intel Edition shares the same features as the regular nForce4 SLI.