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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 95.45+1.3%3:59 PM EST

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To: Dan3 who wrote (55575)9/27/2000 8:53:09 PM
From: sylvester80  Read Replies (2) of 93625
 
Dan3,
Too bad you'll never see them in PCs. They can't even get one channel DDR working. And DDR has run out of breath in video cards too. Doesn't look good for DDR. I bet during 2001/2002 we'll see a shift to QRSL designs for video cards.

Nvidia's Memory Bandwidth Problem

aceshardware.com

The bottom line is: the current Nvidia GeForce-2 GTS can fully utilize up to
20GB/sec of memory bandwidth. The fastest current GeForce-2 you can buy is
the ultra. It retails for $500, because it uses 4-4.5ns DDR memory.
If you overclock the memory (and you will--that's the only reason you would
pay $500 for this card), you can boost the memory to 500MHz (250MhzX DDR)
and get 8GB/sec. of peak bandwidth. And the GeForce-2 clocked at 280Mhz will
use all of that and still be starved for more.

So, how fast would DDR have to be to satisfy the current generation of
Nvidia chips, on a 128-bit bus?

20GB/s / 128-bit (16 bytes) = 1,250MHz, DDR.

In other words, DDR needs to get FIVE TIMES FASTER than it is right now to
match the GeForce-2 GTS.

Or, you could do something like this:

128-bit / 16-bit = 8 : 8 x 3.2 = 25.6 GB/s for a 128-bit databus

What memory does that?

hardwarecentral.com
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