Possible upgrade help

[Jedi]

Hello all.
Recently i got a pc off a friend (which he'll get paid for). And ive noticed it has some things i might want to transfer to my current gaming rig.
My Current Rig is:
Windows 7 Ultimate
2TB HDD
XFX Radeon HD 5770 Graphics Card 1GB
4 GB Ram
Intel Core? i7 Quad Processor i7-860
Kingston DDR3 HyperX 1333MHz 4GB
MSI P55-CD53, P55, Socket-1156, DDR3 Motherboard
Silver Power SP-SS500 500W PSU

The new pc has some stuff i want to put on my current rig:
SAPPHIRE GRA PCX R9 280X 3GB Graphics Card x 2 linked
KINGSTON HyperX 8GB RAMKit 2x4GB DDR3

Here is a comparison of my old vs new graphics card:
http://gpuboss.com/gpus/Sapphire-Radeon-...on-HD-5770

So i am posting here to make sure i can do this and if so any suggestions.

Also on the new pc there is:
http://www.harddisk.no/GA-F2A88X-D3He-So...c/p6881350

http://www.harddisk.no/A-Series-A4-5300-...c/p5285394

http://www.harddisk.no/Netzteil-750W-Cor...c/p5680692

It also has a 160GB harddrive thats not worth linking .

Thanks in advance for any help or suggestions.

Jedi