Does this system support RAM upgrades?

Question

Iron

Good morning! Actually, here is the configuration: Motherboard Gigabyte GA-880GA-UD3H v2 (3 PCI, 2 PCI-E x1, 2 PCI-E x16, 4 DDR3 DIMM, Audio, Video, Gigabit LAN, IEEE-1394), AMD Athlon II X2 250 Processor, 2.0GB RAM, NVIDIA GTS 450. I want to add another 4GB RAM, wouldn't it be hard for this system? It's just that somewhere for a long time it caught my eye that if the motherboard-processor is not very good, then there is no point in installing a lot of RAM, because it won't drag it.
PS I would also like to know if it is possible to install Windows 64bit on 2GB RAM, install all the drivers, configure, and only then, after a week, install additional. RAM? It's just that now I have time to dig deeper, and in a week I'll be busy when I have the opportunity to buy more RAM.
PSS And if possible, which one is better to choose DIMM DDR3, 4GB, Kingston (DIMM DDR3, 4GB, PC3-12800, 1600MHz, Kingston, KVR16N11S8 / 4) or DIMM DDR3, 4GB, Crucial (DIMM DDR3, 4GB, PC3-12800, 1600MHz , Crucial CT51264BA160BJ).
PSSS RAM should be the same company as the one that already stands? Or is it important to know only DDR3 or DDR2?

Answer 1

I want to add another 4GB of RAM, won't it be hard for this system?

add (the board supports 16GB), it won't.

is it possible to install Windows 64bit on 2GB RAM, install all the drivers, configure, and only then, after a week, install an additional. RAM?

can.

which one is better to choose

no difference.

RAM should be the same company as the one that already stands?

no difference, the main thing is that the parameters match.