I'm thinking of bumping my RAM to 16GB (before you ask, yes, I've needed more before with some code I was running, not for gaming). This would be for a Sager NP9150 (Clevo P150EM) I currently have 2x4GB of Corsair Vengeance 1.5V 1600MHz Cas Latency 9 RAM. I'm weighing out two options.

Performance is very important to me, whichever would technically be the higher performer would be what I want. But battery is also important. If 4 sticks will suck up a noticeable amount of extra power, then that'd be a problem too. I'm thinking of just getting a couple of the same sticks which would run me $90 and use all 4 dimms. I don't need anymore more room to upgrade later so I don't mind using all 4. The other thought, is if performance is better or battery life is better, is getting 2x8GB of HyperX PnP since I can also get 1.5V 1600MHz CL9 in that variety and it would cost $140 (and I'm sure I could sell my current sticks for $40-50). For Corsair 2x8GB, I'd either have to get CL10 sticks or 1.35V that is backwards compatible to 1.5V for CL9 but both are more expensive than the HyperX So which would you recommend?

Ok if we are saying pure technical here the 2x8gb may be a better performer. So here is goes; 1.) cas timing is always important. Dsinstaller les applications wavepad masters edition for mac. You want the lowest possible, With DDR3 I think with either 4gb or 8gb you can get them the same. 2.) Command rate, now there is no guaranties here but 2 sticks has a better chance to allow a 1T rate than 4 sticks. So long as you can get the rate as 1T you are fine.

A lot of systems, especially with cheaper ram, will relax from 2 sticks at 1T to 2T so that 4 sticks will work without issues. Now again this all from a technical standpoint.

Review 16gb (4x4gb Memory Ram For Mac Pro

This one is easy to choose: x4 4GB sticks will give you better performance (technically) though we are talking like 2-3% at best and obviously better price since you already have 2x4gb sticks. However, no further expansion capacity later. X2 8GB sticks will give you better battery life (again 2-5% at best) depending on the technology of the 8gb sticks (the newer ones are usually on smaller lithographies so you save power by the better process node in addition to having fewer DIMM modules to power), To put in to perspective,Tweaktown found that 1x8gb 1600mhz CL11 1.35V (newer process node) will give 6% more battery life than 1x4gb 1600mhz CL11 1.5V (older process node). However performance will be slightly slower (we're talking very very small, maybe slightly looser secondary timings on the more advanced sticks). Obviously, cost is greater. As for expansion, I would double check if your notebook motherboard and CPU can support 32GB of RAM as this is not guaranteed.