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Politics : Formerly About Advanced Micro Devices
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To: Paul Engel who wrote (45563)1/12/1999 1:02:00 PM
From: Tenchusatsu  Read Replies (1) of 1573125
 
<Does this mean that the Camino/820 chip set from Intel will also be "considered" a 200/266 MHz CHip set since it will run at 100 and 133 MHz and support double pumped DDR SDRAM?>

Not exactly. The 64-bit processor bus runs at 133 MHz single-pumped, leading to a bandwidth of 1.06 GB/sec. The RDRAM memory interface will run at 800 MHz over a 16-bit bus (actually 400 MHz double-pumped), meaning its bandwidth will be 1.60 GB/sec. This means that there is more memory bandwidth than the processor bus can handle. The remaining 0.54 GB/sec bandwidth will be used for AGP. An AGP 4x device runs on a 66 MHz quad-pumped bus over 32 bits, leading to a bandwidth requirement of 1.06 GB/sec.

Of course, if you don't have an AGP card in your system, then not all of your RDRAM bandwidth will be utilized.

Tenchusatsu
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