What is better?
 

Which is better?

128mb of RDRAM (For the P4) or 256mb of Vitual Channel AMD based SDRAM (ram for athlon processors)

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"I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious." -Vince Lombardi

Well, your performance benefit of using RDRAM is pretty negligable. And the price high. I would suggest VC SDRAM as it is quick and so unbelieveably cheaper. The difference between 128 and 256 is very noticeable. I would suggest 256 SD Ram definitely.