RDRAM help - 128 sticks wont work with previously installed 64's

Ok I just tried to install 128 megabyte PC800 RDRAM modules into a Sony Vaio ---there were already 2 sticks of the 64 meg RDAM previously installed--am I missing something here? What could cause the RDRAm to not work with each other? I have four slots--previously there was a 64 stick and then the cimm, a 64 stick and then another cimm. I changed it to 2x128 and then 2x64 -- and the machine wouldnt boot. I heard that RDRAM can be bitchy about using sticks from diffferent manufacturers--is this possible? how about could it be a mismatch of ECC and non-ECC? I cant find any info on the old sticks to detremine if it is ECC or not. The new ones are non-ECC.
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From my experience, an RDRam stick is very particular about what conditions it will work in.
First of all, check www.kingston.com to see if it fits the memory profile for your comp.
Other stuff you need to know:

1. RDram always come in pairs
2. each pair has to be the same
3. all sticks in the setup should be of same make and model.

In other words, I think the best thing to do is get more memory direct from Sony, or you`ll be mixing and matching many a sticks of RD before you find a configuration that will work.

Good luck.

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