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most knowledgeable/best place to buy RDRAM???

J

jeff2100

Junior Member
I need to find two 256 MB sticks of low density PC800 RDRAM which will work in my year-old Tyan Thunder i840 motherboard. I have 2 existing Kingston KVR800X18-16/256 256 MB modules which work, but I want to upgrade from 512 total to 1 GB total and the working modules have been discontinued. I bought two KVR800X18/256 higher density modules and they didn't work at all (alone or with the existing double sided low density KVR800X18-16/256 modules.)

Does anyone have advice on low density 256 MB PC800 modules which would be compatible with the existing KVR800X18-16/256 modules? Kingston was unable to offer a recommendation since these were discountinued on what to buy to work with them.

Alternately, does anyone have a recommendation on where I should try to purchase a compatible module from - either a store which really knows their RDRAM and could offer advice and/or a store which would let me purchase and try a couple modules with a liberal or low cost return pollicy.

Thanks in advance.
 
tried Crucial and no go

Crucial doesn't even sell RDRAM.

Jeff2100, I'm currently selling some RDRAM. Check your PM.
 
Kingston has the 512mb version of the memory your using expensive though. KVR800X18-16/512. Newegg has some simpletech memory that should work. Memory Page
This is the model# RB800X18-16/256 available at newegg $113
 
I don't really understand the density issue at all, but I was under the assumption that the 512 MB Kingston module would not work - Based on what Tyan said, I thought the -16 was the number of chips on the module, so 512/16 would be twice as high of a density as 256/16 and thus not work. This could well be way off the mark, and if so I would really appreciate if someone could explain exactly what the -16 means and the density issue at play here.
 
That simpletech module might be perfect and newegg is a great store to deal with - I think I might give that a try as it looks like the right module.

Thanks!
 
OK - I obviously don't understand the density number.

Does anyone know exactly what the -16 means in the Kingston modules that work?

For example, the description for the SimpleTech Model# RB800X18-16/256 says:

184Pin RDRAM Rambus 800MHz, 40ns, 256MB with ECC, 8 Chip tRAC, 8 Layer PCB. (Compatible with INTEL D850EM series, ASUS P4T533 series, IWILL P4R533 series, Dell 8200 series and many others that require 40ns!) Backwards compatible with slower 45ns Rambus. Model# RB800X18-16/256

SO what exactly does the -16 density number that I need refer to?
 
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