you can get different ram just stay with the same speed and timmings if you do i recomend gskill i love that brand i have bought a few hundred sets and only had to rma one had many more problems out of corsair but everyone has there brand

honestly id sell those and just grab this kit a full 16 gigs 
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231499 

pghaffari

http://www.newegg.com/Pro...x?Item=N82E16820145292

i have these, what do you recommend getting to add to them?

 
funny thing is that you own the fastest ( 3 X 2gb modules) available on newegg.. so buying another 3 would make sense, do you have 6 ram modules on your mobo?
 
you can go ahead and get  3 X 4gb   modules for around same price
http://www.newegg.com/Pro...x?Item=N82E16820226196
 
^ mushkin is a brand i trust with my life , and those are a bit faster ram then yours for only 20 bux extra

having 3 modules vs 6 modules is less stresful on the cpu ( memory controller is on the cpu) 

well for a tripple channel kit id pick up 2 of these for 24gb's ram and they are 1600 but will oc to 1866 and honestly there really isnt a difference between 1600 and 1866 plus lower voltage
 

if you can max out the 12 gb then yes if not then no but i like to max out my ram 

pghaffari

what do you mean my maxing it out? Like the timings..?

Do you use all 6GB when you are rendering? If not then there is zero point in getting more. If you are using all 6GB then you could use more RAM.
Generally more RAM does not make your computer faster. It only makes it faster if you use all of it and your computer could utilize more. Faster RAM would mean a higher MHz or tighter timings. Generally you get more speed from a higher speed vs the tighter timings.
With the X58 platform anything higher than 1600MHz can lead to stability issues because of how weak the IMC [Integrated Memory Controller] is in the CPU. This can generally be alleviated by increasing the CPU VTT Voltage in the BIOS.
 
I have never rendered a video before so I do not know the average consumption of RAM. Most people I see who do Render and Encode stuff like to have 24GB of RAM.
I would get this kit here http://www.newegg.com/Pro...x?Item=N82E16820231359
If you got money to burn, these have tighter timings but cost four times as much http://www.newegg.com/Pro...x?Item=N82E16820231458
 

depends on your cpu but there probably isn't a need for a full upgrade