Hello everyone.

I'm here in need of advices concerning RAM module I have to buy to upgrade a PC.

Basically, this PC now has one 4 Gb RAM installed, and I'd like to upgrade it. The only thing is I don't know if I should buy another 4 gb RAM, or if I can buy a 8 gb module.

I can buy the exact same model, same Hz, same ticks, everything is the same. I think I've always heard that it's not good to put different sized RAM in the same PC, like you absolutely have to make it 4+4, or 2+2, or 8+8, but never 2+4, or 4+8 for instance. Is it true ?

Also, on the motherboard manual, it is said that :

"This motherboard provides four 240-pin DDR3 (Double Data Rate 3) DIMM slots, and supports Dual Channel Memory Technology. For dual channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR3 DIMM pair in the slots. In other words, you have to install identical DDR3 DIMM pair in Dual Channel ".

So, basically it seems it is not good if I put the 4 gb RAM and the 8 gb RAM. The Dual Channel memory won't work, but does that mean that the PC won't benefit from 12gb RAM in the end ? Is it bad if Dual Channel Memory isn't used, or is it okay without it if 12gb work ?

Thank you very much in advance if you can enlighten me.