Adding More RAM to a System

Hardware Build a PC
1

I built my system about 9 months ago with two 4GB sticks of Corsair Vengeance RAM. They are running currently at 1600MHz and have timings of 9-9-9-24. I want to add another 16GB(two 8GB sticks) of the same line of RAM from Corsair but the timings are different, 10-10-10-27. I want to know if it is possible to have two different timed sets of RAM in one system.

My Current Rig: 

AMD fx8350(running at 4.6 GHz at 1.4 V) 

Asus M5A99FX PRO R2.0 

8GB 1600 MHz Corsair Vengence 

Asus Geforce GTX 770 2GB DC2 

Corsair TX750M 

1 TB WD Blue HDD 

Corsair H100i

2

yes it is possible but you might run into some issues with stability if you don't take proper steps to ensure stability.

if you place the 2 4 gig sticks in the same channel and the 2 8 gig sticks in the same channel it should be fine.  and if you loosen the timing of the 4 gig sticks to match the 8 gig sticks it would be even better. depending on your motherboard this should not be hard to accomplish.

3

More than 8 gigs of DDR3 1600 Mhz is overkill if main PC usage is for gaming and web surfing ...

as for your question ... someone that knows will have to answer.

4

Shouldn't be a problem. Just match your dimms in the corresponding channels. Likely you would from left to right on your mobo have 

8GB in slot 0  --> 4GB in slot 1  --> 8GB in slot2 --> 4GB in slot3

This is how most boards configure the channels this should ensure that the Double Data read is able to work correctly.

5

Yes it'll work, but likely your dimms running at CL9 latency will run at a slower CL10.  Since this is only DDR3-1600, compatibility shouldn't be a huge problem.