First of all you cant search that out since those numbers are only on the sticks themselves not on the box. I highly doubt vendors are going to open their sealed boxes before they sell them just to find that out for you. The product numbers are exactly the same. This is misleading and not right. Anyways, memtest posts my bandwidth at 5006mb/s with 3.2ghz quad and 1068mhz 5-5-5-15 2t with my 2 older sticks. And the exact same setup but with the newer sticks i get 3470mb/s. I dont get any errors though. With all four of my sticks in memtest reads 3470mb/s because it reads the slowest sticks. Noone can tell me that it is right for Crucial to revise sticks without stating that information somewhere on the box.