QUOTE(krizalid88 @ Mar 21 2009, 11:56 PM)
seems like now how much bit is not important anymore like b4.. eg;
GTX gc got 512bit and more but still kalah with new 128bit gc.. nowadays gc technology becomes more complex..

dun get confused.
the RV740 128 bit refers to 4750 (2 version, ddr3/5), not 4890.
4890 is 256 bit, ddr5.
bandwidth of the card is calculated by it s GPU supported bit & also memory speed.
example, 4870 wit 256 bit & fast ddr5 actually has more bandwidth den gtx260 (448 bit) wit slower ddr3.
ATI & nvidia opted for different die strategy.
because GPU with higher width (bits) also means bigger die, it will be mor expensive to produce to produce.