IF YOU BUY SEPERATE STICKS OF RAM THAT ARE MADE BY GSKILL AND THEY FAIL IN COMBINATION GSKILL WILL FAULT YOU FOR NOT BUYING THEM IN A PACK SET.
Part of your problem is your use of the word "fail" or "failure". In the above quote from G.Skill they are referring to the RAMs not working "in combination". It's not that either RAM "fails", it's that they won't work together. G.Skill is saying "It's not our fault that you bought the wrong RAM". Duh.
This goes back to what I said about buying identical
RAM. Obviously, if you buy one stick of DDR3-1333 and try to use it with a stick of DDR3-1600, you could have some "combination" issues. The same holds true if you get one stick of DDR3-1600 with 9-9-9-24 timings and try to run it with a stick with 8-8-8-21 timings, etc. (Especially if the motherboard tries to run both sticks with the 8-8-8-21 timings.)
However, if you were to buy 2 of these (separately) - http://www.newegg.ca...N82E16820231313
It would be the same as buying one of these - http://www.newegg.ca...N82E16820231314
It's all the same RAM, just that in one case 2 RAM sticks come in the same package. (You could also buy 2 of the Dual-channel kits to us in a quad-channel motherboard (socket2011).
Note#1, there is very little (if any) actual factory testing of RAM modules. Because of the low failure rate, it's cheaper for the company to simply replace bad RAM that the customer returns, rather than test it all.
I got a RAM stick once that actually had a loose capacitor sitting under one of the memory chips in such a way that half of the memory chip's legs were not contacting the circuit board. It was obvious once you looked at the stick, but no-one noticed until after I put it in the motherboard and it didn't work.
Note #2 - there is no such actual thing (at this time) as "dual-channel RAM" (not counting some specialty graphics RAM). They are all single channel sticks. It's the CPU that has single-, dual-, triple, or quad-channel "access". A "dual-channel" RAM kit is merely two single channel sticks packaged together.
Edited by Quaker, 29 November 2012 - 03:48 PM.