Mac Pro X5355 upgrade with ram

i have picked first mac pro 1.1 (2x 3.0 mhz x5160's, 4gb ram, , 500gb hdd) on ebay $788 shipped door. price??

anyway real question this; mac pro came 667mhz ram, max speed ram system can accept?? upgrading dual x5355 processors have 1333mhz front side bus speed, mean can use ram rated @ 1333mhz? or stuck @ 667mhz system??

want squeeze as can out of system, doing hd video editing, , music production it. appreciated, need know before can order ram upgrade. thank you.

 

the ram can use system 667 or 800, 800 clock down 667, there no great advantage. if want squeeze out of system perhaps @ dual quad mac pro 3,1 used, might come out same money @ mac pro 1,1 , cost upgrade processors.

 

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