"At the heart of the G450 sits an updated G400 chip with a second RAMDAC and a DDR memory interface. The rest of the core has remained unchanged, aside from being shrunk to an 0.18 micron process. Now, if your heart started beating higher when you heard the word "DDR", let me slow your pulse right down again: Matrox has decided to go with a 64Bit DDR memory interface. The old G400 cards are equipped with a 128Bit SDRAM interface. So since DDR RAM is only 85-90% as efficient as SDR at the same clockspeed, this is more of a small step backwards than an improvement."
FULL STORY @ RIVASTATION (http://www.rivastation.com/g450_e.htm)