Originally Posted by candy_van
Sell off your 6GB kit and get an 8GB+ kit then if you need a little more (though for your needs 6gb should be fine, it sounds like something is unnecessarily chewing it up).
It's always better to use matched pairs, it's not that you can't mix memory, but some boards play nicer with that than others.
DDR3 is DDR3, dual VS triple sets don't mean anything other than how many paired DIMMs come in the kit.
Also the benefits of triple over dual channel are little to none for the vast majority of applications any of us use, so don't worry about "downgrading" to a dual-channel kit as some would claim.
First off, to the OP, don't get the Team Vulcan ram that you linked in your first post. Those modules, along with many currently being produced, are single-sided modules and they do not peform as well as double-sided modules due to what is called "bank interleave". You can look that up if you like, but everything else being equal, a pair of double-sided modules will outperform a pair of single-sided modules. You can identify single-sided modules by looking at the PCB just above the "golden fingers". The S/S kits have a row of closely arranged SMC on the side with chips and none on the back (bare) side, while on the D/S kits these will be spread out and visible on both sides of the PCB. Look below for examples...the first is double-sided and the second pic is of a single-sided module.
Moving to the post quoted above from candy_van
...this is actually pretty good advice on several points. First off, the comment about dual-channel mode being as equivalent to tri-channel, performance wise, except for a few types of applications is correct and easily verifiable. Your easiest and cheapest would be to move up to 2x4GB (but read my last comment for another option).
Secondly, the problem with mixing ram is mostly due to mixing the memory ICs used to produce the modules, as different ICs have different attributes, such as how much voltage they like, and what kind of sub-timings they can run. Because of the fact that your kit is an older kit, the odds of getting similar ICs is going to be small, and if you move to 4GB modules, then the odds become almost impossible. Some Hynix BFR and Samsung HCH9 memory chips were used in both 2GB and 4GB modules, but the 2GB are single-sided and the 4GB are double-sided, plus I'm pretty sure that your OCZ did not use either one of those chips. If you get yourself a new 2x4GB kit, or if you really feel like you need it, get two of them and run the 16GB in dual-channel (populate 2 slots on two channels, leaving both slots of the third channel empty) you will know that you are using matching ICs. Buying two 2x4GB kits at the same time from the same retailer in all likelyhood will be the equivalent of getting a quad kit. Sometimes one way is cheaper than the other, it just depends on the particulars of what you are looking at. The impact of mixing ICs mostly comes into play when you begin to overclock, so it may not be as big a factor if you don't overclock.
If you are not going to overclock, then you could also TRY running tri-channel under the following scenerio...buy a 2x4GB kit with the same basic timings / voltage as your current tri-channel kit. You would then populate one slot of each of the first two channels with a 4GB module, and then populate TWO slots of the THIRD channel with 2 of your 2GB modules. This would give you 12GB of ram running in tri-channel, but since you are now for sure running different ICs, the potential for overclocking the ram might be limited. Source for this info is linked below. The Intel article addresses running dual-channel with 3 sticks, but it would work the same for running tri-channel with 4 modules, as long as you end up with 4GB in each channel.
http://www.intel.com/support/motherboards/desktop/sb/CS-011965.htmEdited by Reefa_Madness - 5/17/13 at 8:18am