Graphics DDR design win at Matrox, and Carl's rule of thumb calculation for it:
Matrox G450 First Glimpse
With the G450, Matrox decided to use a 64-bit memory bus connected to 32MB of DDR memory.
sharkyextreme.com
matrox.com
Assuming a 333MHz data rate for the DDR memory chips, the card has a peak bandwidth of about 2.7GB/sec. The ratio of bandwidth to memory size, is thus:
2.7GB/sec/32MB = 84Hz, nearly in the center of Carl's rule of thumb for graphics memory bandwidth of 30 to 120 Hz.
I should note that the above design win didn't happen yesterday. It is at the very absolute minimum 9 months old, and probably older. At that time, there was still some life left in the Rambus machine, but the graphics guys had already decided, enmasse, to go with DDR. So now you see three different chipset design wins for DDR in graphics, Nvidia, ATI, and Matrox. This sort of situation will be repeated in taller DDR chips this summer, but with all kinds of companies announcing all kinds of products using the new x4, x8, and x16 DDR chips.
-- Carl
P.S. If you are trading RMBS for the short term bounce I suggested yesterday, it is time to move your stop loss up to today's low. |
