Info about RAM. URGENT!
 

Hi, I'd like to ask a question please.
My dealer is assembling a new PC for HDV video editing with Edius NX.
The PC is a little bit expensive for me and the dealer has just told
me to change the RAM to get a cheaper PC.
My MB is Asus P5W HD DELUXE and the microprocessor is CONROE E6600
2,40GHz FSB 1066 4MB cache LGA775
I'd like to purchase 3 GB DDR800 Mhz but the dealer has just told me
to puerchase 3 GB DDR667 Mhz because there is a very little difference
of quality.
In your opinion it is better to purchase DDR800 Mhz or DDR667 Mhz?
Where is the true?
Thanks