Would this work?

[L3THALSHADOWz]

I currently have this motherboard http://www.amazon.co.uk/Asus-M5A78L-M-USB3-Motherboard-...
AND this RAM http://www.amazon.co.uk/gp/product/B006YG96YA/ref=wms_o...

I was wondering can i add another 4gb of this ram? http://www.amazon.co.uk/Corsair-CMZ4GX3M1A1600C9-1600MH... 

If i buy it and add it to my current motherboard will everything work fine or does it have to be same brand? Thanks

[vigorstick]

Don't try to add the corsair RAM. The cas latency of the memory sticks are different. This will cause stability issues like programs crashing.

[Faceman]

I currently have this motherboard http://www.amazon.co.uk/Asus-M5A78L-M-USB3-Motherboard-...

AND this RAM http://www.amazon.co.uk/gp/product/B006YG96YA/ref=wms_o...

I was wondering can i add another 4gb of this ram? http://www.amazon.co.uk/Corsair-CMZ4GX3M1A1600C9-1600MH... 

If i buy it and add it to my current motherboard will everything work fine or does it have to be same brand? Thanks

I wouldn't recommend doing that.  These RAMs have different timings, and in order for them to work, you would have to set the Ballistix RAM to 9-9-9-24.  This is doable, and fairly easy, I have just heard that to get the best results, you should buy the exact same stick of RAM whenever possible to avoid instability and problems.

[Lotus]

If you set the ram timings to the slowest one, it'll be fine, but if you don't you'll run into problems. Basically, with stock settings they wont work, but you can force it to work pretty easily.

[L3THALSHADOWz]

ok thanks everyone . will try and fing 8gb for cheap