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Nevermind I found the answer myself:

The socket 423 mobos are based on the i850 chipset and only support Rambus RIMMs. One motherboard maker suggested there is a surplus of such boards in the market, including some from Intel, and some companies will be tempted to dump.

For most users the Socket 478 platform is more viable and cost-efficient for the future, a mobo maker told the INQUIRER. "RDRAM costs are higher than PC133 and DDR by up to 66%, although RDRAM does offer some performance benefit, it's not the best solution for all mainstream users, Socket 423 strictly supports RDRAM only."

The problem is that Socket 423 processors will only reach speeds up to 2.0GHz and will eventually be phased out. Socket 478 appears to provide the best upgrade path for P4 as it will be supported for both Williamette and Northwood (0.13 micron) processors, while only Socket 478 P4s will have speeds over 2GHz.

Sources close to INTEL tell us that next year the Pentium 4 will reach 3GHz and, later on, 4GHz.

First off, Socket 478 supports PC133, DDR, and RDRAM, as Intel has pointed out in presentations to its customers recently.

There we go. So anyone doing an upgrade to a P4 CPU - make sure to have a Socket 478 mobo.

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