Is this for Sandy Bridge? If so, for the cost of RAM nowadays I would set the Corsair sticks aside for spares and buy a new 8GB kit that's rated at 1.5 v. Here's a thread with some insight including the resident Intel guy -
http://forums.anandtech.com/showthread.php?t=2186036&highlight=sandy+bridge+memory+voltage
Do you really need 12GB? Do you have dual channel or triple channel MB? (SB or X-58?). (If it's triple channel you would use three or six sticks to enable; it would be either two or four to enable dual channel.). Because see you have a triple channel memory kit, but are looking at a dual channel kit (the memory itself is the same, I'm just talking quantity).
Edit: On second look, there is conflicting information. I guess it is three modules but says dual channel in the name.
To answer your first question, probably. Mixing RAM is not recommended but you might be able to get it to work (might need to tweak some BIOS settings like voltage to adjust for the difference).
I've discovered that -- in some cases -- you can mix, but you should "mix and match."
* modules made by the same manufacturer with the same specs OR . . .
* modules made by the same manufacturer using the same parts but with slightly different specs where the differences reflect mostly the speed rating
These sorts of constraints make it likely that you can over-clock both sets of modules to match the "possible" latency settings that are more limited. For instance, I was able to get a set of G.SKILL "Black-PI" modules to run at something like 4,3,4,9 @ DDR2-850. I have a set of G.SKILL modules rated at DDR2-1000 proven to run at about 4,4,4,12 at 800. I can run them together at 4,4,4,12 at between 820 and 850. The voltage spec on these kits is such that the 1000's require a slightly higher voltage just to "get there," and both kits use the same identical voltage at lower settings.
I suspect there is some meaningless product-differentiation in the product-lines of companies similar to G.SKILL: they produce modules with different "appearance" in the heatsink designs, but the parts may be quite similar -- as are the specs. They can increase their sales by differentiating such a product line, without increasing production cost.
Latency settings are far less important for either DDR2 or DDR3 modules. Further, if my example weren't for an older computer in attempting to get extra mileage for 8GB vs 4, I'd pay attention to the facts cited by stargazr: memory is so cheap right now, you would just do better springing for a new kit . . .
Keep the old ones for any number of reasons, including the need to have test modules when something seems to go wrong, and you need parts for diagnosis . . .
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