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Politics : Formerly About Advanced Micro Devices

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To: tejek who wrote (99660)	3/23/2000 10:58:00 PM
From: Petz	Read Replies (3) of 1574680

ted, re:<I thought RDRAM allowed much more bandwidth and speed than even DDR....that article would indicate that DDR and RDRAM are comparable technology. Is that correct?> Do a search for "RAMBUS 600mhz" on pricewatch (without the quotes) and you'll find the cheapest 64M module at $349, and the cheapest 128M module for $641. The actual clock speed of this "600 MHz" RAM is 533 MHz (not kidding!). Since RDRAM has a 16 bit (2 bytes) bus width, it can do 1066 MB/sec peak. The lowly $99 128M PC133 stick I bought last week has a 64 bit (8 bytes) bus that operates at 133 MHz. Its peak bandwidth of 1338 is also 1066 MB/sec peak, exactly the same as that expensive "600 MHz" RDRAM. RAMBUS purists will claim that with RDRAM the peak bandwidth is more likely to be reached in real applications with complex addressing patterns. Maybe so, and maybe not, because RDRAM's latency (delay until you get the first bit of the data) is worst* than even PC100 memory. Petz

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