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Politics : Formerly About Advanced Micro Devices
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To: FJB who wrote (67455)8/3/1999 3:52:00 AM
From: Tenchusatsu   of 1574493
 
<No, that is not the case. You can buy 32MB DIMMs with four 64Mb chips on them.>

You're right. Thanks for the correction.

I originally thought that all SDRAM chips were 8 bits wide, and thus you need eight of them to make a full 64-bit data path. But apparently, there are also 16-bit and 32-bit SDRAM chips out there. They allow for four-chip and two-chip configurations, respectively.

Still, because the number of bits must add up to 64, SDRAM requires a higher pin count than DRDRAM. Two DRDRAM chips can still sit on one 16-bit channel, while two 32-bit SDRAM chips must sit on a 64-bit channel. In this respect, DRDRAM is still preferable over SDRAM when it comes to the PCOAC architecture of Timna. (DDR SDRAM adds even more pins over regular SDRAM because of electrical concerns.)

Tenchusatsu
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