I guess I'm just not understanding the "probably will cause problems" part when I've done just that a few times in the past, added another identical set of the exact same memory, and it's never caused me any issues before, just as long as I populated the board in the correct slot/order per the manual for whatever mobo I was using. I've never had any problems achieving their rated speeds, if not faster, either through an XMP profile or through the bios or any issues I was aware of with overclocking the CPU.
I know I'm going to have 64 GB of ram, and some that I've been looking at I've been unable to even find in sets larger than 32 GB in any case. I can find plenty of 32 GB sets of 2400 corsair vengeance pro, for example, but I haven't seen it in 64 GB. Although the G.Skill 2400 Ripjaws Z's that I've pretty much settled on I do see 64 GB sets, but that would set me back several weeks and I'd have to watch another well over $2,000 in other hardware BNiB go past their 30 days RMA window before I'll have had any opportunity to see if it's DOA or not, and I'd MUCH rather be able to deal with the seller if that's the case instead of the hardware companies themselves.
I was minutes away from ordering a 32 GB set of 2400 G.Skills, but now I'm not so sure whether that's such a good idea or not. The 4930k is on the way, and this RIVBE mobo should be right behind it, and the ram is the very last thing I'm still lacking. I'm sitting on just barely enough for the 32 GB set right now, but it'll probably take me 2-3 more weeks, if not a little longer, to come up with the rest of the $ for the 64GB set.
Edited by Unicr0nhunter - 11/16/13 at 6:36am