Does it matter what type of ram I put inside my machine. I've currently got 256MB RD, but could i put in DDR ram?Cheers

Yes, it matters. If you currently have RDram that means that your motherboard is designed for RDram and won't work with DDR ram. If you're considering ordering more RDram, you might want to take a look inside the box and check to see how many slots you have as RDram is sold in pairs only from what I understand. Someone correct me if I'm wrong with the pair thing. Also, don't mix and match different brand names of ram. If you got a certain brand like Kingston, stay with Kingston. If your motherboard will handle 512mgs of ram, you may have to buy two sticks of 256mgs, etc. First thing to do is to look in your box and then do some research on your motherboard and RDram and find out what your options are.

All depends on whether your motherboard supports it. If you're running an older system with a P3 or earlier, or a sub 1MHZ AMD, chances are your motherboard doesn't support it. If you have a newer P4 or an AMD 1.5 MHZ+, maybe....If you built your system, you should pretty much know the MB you have in it, and the MB docs will show what RAM is supported. If it was a brand-name or locally built system, you'll have to find out from the mfr. whether DDR is supported. Some mfrs. only allow their own memory to be installed--one of the reasons I started building my own systems.-Johnmgdbottled has a good point as well.... If RD in your post referenced RAMBUS, then you may be out of luck....

Your motherboards chipset has to support either PC 1600, 2100, or 2700 memory for you to be able to add DDR RAM modules. What kind of motherboard is it you are using?