SPgamer007 :
On exception i agree. i wouldn't spread false information, most of the time it has worked for me , aswell the different CAS timing and speed, with the same kingston 4gb memory already in system as he linked i think OP won't face any problems.
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As said, no guarantees, I've gotten sets straight from the manufacturer that wouldn't play, also they might play fine on one mobo, but not another. I prefer they know it up front, have plenty who were told "It'll work just fine", and then the sticks won't play, so IF the etailer will even give a refund, then the people had to pay return postage, and often restocking fees and up out $20 or more and then have to rebuy DRAM....