ya i think its a problem with newegg.ca it was doing this last night to me. thanks for the reply, so basically i can go to the 1600mhz and it will be fine on my msi 870A-G54. the specs say Memory Standard DDR3 800/1066/1333/1600 (OC)
The OC means that you have to overclock the CPU to get those speeds. I don't know how much you were looking to spend, but MSI isn't the highest quality board brand. I'd check out a Gigabyte GA-770TA-UD3 (no Crossfire) or GA-790XTA-UD4 (Crossfire) for a couple of the best boards out there.
I should point out that the GA-770TA-UD3 is basically the same price, including shipping and the rebate. It's higher quality, so I'd definitely recommend switching to it. It's also got more slots, so it's better for expanding later.
The 8xx boards aren't that much better than the older 7xx boards. The only major differences is the ability to drop in the X6 CPUs without a BIOS update (which may or may already be included in the older boards) and the full USB 3/SATA III support. The older boards will have support for the newer devices, but not all of the ports are USB 3/SATA III, just some of them.
Basically, there isn't a whole lot of good reasons to pay more for a 8xx board. You should save the extra money (or in this case, get the higher quality).