the 550e's cache runs at full clock speed whereas the 550's cahce runs at half clock speed.
i had both however , and didnt notice much of a difference. although , i gave my 550e to my father when i upgraded to a 700 , and he has it clocked at 733 for months now with nary a blue screen to be found. i take that back , his video card couldnt handle the higher buss speed , but once he rplaced his aging i740 based card with a Viper770.
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