I went to Fry's to pick up my Corsair Dominator ram which was on sale for $139.99. The sale guy talked me into buying the Kingston HyperX instead which was $149.99. He said it has lower cas lantency. I kinda feel regret I didn't get the Corsair.
However, if you look at the Fry's site....
Looks like they do have Corsair on special, but it's not the Dominator but the XMS model. This is $139.99 and has a $15 rebate -- and it's got a worse/higher CL http://www.frys.com/product/5820723
So, might be possible that the Corsair you were looking at for $139 was not Dominator. In which case, the salesman did you a favor. However, if there was an ad misprint and they were really selling their Dominator for $139 w/CL=7, then you should have gotten it.
I think you made a great trade! And I think Fry's didn't mean to put the Dominator at that sale price, so employees were encouraged to point folks at the cheaper RAM.
Goes to show you it's good to be prepared. Guess you didn't run into the same salesman and ask him why when two products have identical specs, he would say one is faster?
Remember to set your motherboard's DRAM voltage to 1.65 after installing it, then reboot and see what it displays on POST. Might have to manually set the speed, depends on how it sees the RAM. Use CPUz at www.cpuid.com to compare the SPD data to how the memory is set. And you can experiment with the XMP settings!
Got some of the coolest heat spreaders out there too
Well, you should likely set the normal stuff. The voltage and the speed. Don't mess with any type of overclocking - no timing changes, etc... The stuff that comes off of Auto / SPD should be fine. And make sure the right amount is showing.
If your board supports XMP I wouldn't touch it before installing your OS.
And, first time you enter the BIOS, set it to Optimized Defaults or similar. Then review items you want to set, like the Date and Time! lol... and the RAM.