When Asus first released the P4T533, 32-bit RIMMS were so scarce that they bundled the memory in with the mobo purchase. So, back then you could get a P4T533 with a single 512MB 32-bit stick of RDRAM, b/c it came bundled. But now, the memory is somewhat more available through online vendors than it was back then. However, I bought my P4T533 about three weeks ago and at that time I couldn't find a single place online that sold single 512MB 32-bit RIMM4200's. There are a few entries on pricewatch.com for 512 MB 32-bit RDRAM 1066Mhz RIMM4200's, but essenstially all the vendors are doing is selling you two separate 256MB modules. I was like you, I wanted a single 512MB RIMM4200, but I swear I just couldn't find a single place that sold them online. I looked and looked to no avail. One of the things I was doing was getting the exact Samsung or Kingston part number for their 512MB RIMM4200's and just doing searches for those exact part numbers on google.com. There was always a lot of matches but I never found any places that actually sold the modules. The Samsung part number for their 512MB 32-bit RIMM4200 is MD-18R162GAF0-CN9.
Question: Where did you see that the P4T533 bundled with 512MB RIMM4200 was cheaper than the P4T533-C bundled with 512MB RIMM3200? Also, was it two 256MB RIMM4200's or just a single module that was bundled with the P4T533?