To: Jdaasoc who wrote (72550 ) 5/11/2001 12:47:51 AM From: Bilow Respond to of 93625 Hi Jdaasoc; Re: registered DDR DIMM prices... It's a bit deluded of you to imagine that the unbuffered DDR DIMM pricing is unimportant. There is vastly more unbuffered DDR sold than registered. If you go to Compaq's website and have them build you a DDR machine, they're going to put unbuffered DIMMs in it. Same with MicronPC (or whatever they're called now) NEC and HP. Same with the vast majority of the screwdriver shops. It's pretty obvious that the mainstream PC industry is converting from SDRAM to unbuffered DDR. I can put 1GB of unbuffered DDR DIMMs in a single channel machine now, that's enough for my next workstation. Registered DDR is only going to be used in machines with very large memories, and yes, it is going to carry a premium. There is no way that RDRAM is going to be used in large memory computers. The first problem is that it is considerably more expensive. The second problem is that you can only put two RIMMs per channel, while you can put 4 registered DDR DIMMs on a channel. The third problem is that RDRAM takes up more die size than SDRAM (or DDR) and consequently the manufacturers are always later with high density RDRAM than they are with SDRAM. Because of all this, as a practical matter, you can put 4x as much SDRAM on an SDRAM channel than you can put RDRAM on an RDRAM channel. If you're going to go around comparing registered DDR DIMM and RIMM pricing for servers, you automatically are going to want the largest possible sticks. Unbuffered parts make sense for small memories, registered parts are for large memories. For that reason, maybe we should look at 512MB DDR DIMMs:pricewatch.com Oh, I forgot. There are no 512MB RDRAM modules to compare them with. How did that happen? There's 512MB PC2100 DDR modules, 512MB PC133 SDRAM modules and even 512MB PC150 SDRAM modules, but no page for 512MB RDRAM modules:pricewatch.com pricewatch.com Drat! I guess we'll have to go with 256MB DDR DIMM modules. Unfortunately, they're kind of rare so far, since most of the market for DDR has been the unbuffered, but PriceWatch does have some for PC2100 ECC 128MB DDR DIMMs for $130: Or you can order them direct from Micron for $101.69:crucial.com By comparison, the cheapest 256MB PC800 RDRAM RIMM with ECC on PriceWatch is $198. Re: "I still stick to my assertion that RDRAM will be within 20% of SDRAM by Sep and similar in price to registered DDR with all that glue on DIMM. " This is a simple miscalculation of yours. The reason you're wrong, wrong, wrong is that CGS costs for even registered DIMMs are dominated by the memory chips. The glue stuff is also called "popcorn logic" in the industry because it is nearly free. But of course since I'm the one telling you this you will never believe me, LOL!!! I'm too busy to find you a link with pricing for those little babies, ask me again later, if you want proof. The pricing is not a matter of the CGS, it's a matter of volume. That's why registered DDR is cheap on Crucial. -- Carl