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Politics : Ask Michael Burke
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To: Michael Bakunin who wrote (77802)3/14/2000 9:28:00 AM
From: gnuman  Read Replies (1) of 132070
 
mb, re: <..but, isn't one of Rambus's selling points a similar interleave of multiple channels?>
I believe it's true with the 840 chip set you can interleave two channels. (Which can result in double the data rate). I understand without interleave RDRAM 800 only provides double the data rate of PC100 DIMM. (RDRAM R/W's 2 bytes vs DIMM R/W's of 8 bytes).
Also, DDR equals the data rate of RDRAM and could be a server solution. But they have timing issues similar to RDRAM.
I think the real issue is cost. By interleaving multiple DIMM channels you can also increase the data rate and I think the price/performance of that solution is more attractive to the server industry. (Interleaving two DIMM channels equals the data rate of non-interleaved RDRAM). And for the desk top RDRAM is currently much too expensive.
As the cost of 256Mb RDRAM's come down this could change. (You can make a 32MB module with one 256Mb RDRAM). But the mobo/RIMM designs have become more science than art and require higher mfg/test costs than DIMM's. (I still think there will be problems with mixing/matching RIMM's from different suppliers).
If you haven't seen it, Toshiba has a white paper on the merits of the various DRAM technologies. (Biased to RDRAM).
toshiba.com
JMHO's
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