Crossfire quick question

[Christian Acosta]

Hey guys so I'm planning to upgrade my desktop and I'm thinking of adding a second gpu instead of buying a high end one
here's the specs

1x
Antec GX500 ATX Case w/ Window
1x
AMD Athlon X4 860K Processor, 3.7GHz w/ 4MB Cache
1x
MSI A58M-E33 w/ DDR3 1866, 7.1 Audio, Gigabit Lan, PCI-E x16
1x
Sandisk Ultra Plus Solid State Drive, SATA III, 128GB
1x
Asus 24x DVD-RW Drive, SATA, OEM, Black
1x
Microsoft Memory Express Windows 7 Home Premium x64 (64-bit) SP1 (For Memory Express System Builds only)
1x
eVGA 500B 500W Bronze Power Supply
1x
Asus Radeon R7 260X OC 2GB PCI-E w/ DisplayPort, HDMI, Dual DVI
1x
G.SKILL RipjawsX Series 8GB PC3-17000 Dual Channel DDR3 Kit (2 x 4GB)

and yes I will be upgrading my mother board but I'll most likely leave everything the same
my question is 500 watts enough to power this pc if i upgrade the mother board to a crossfire compatible one and add another gpu?

if not then how much watts do you think I will need? thanks in advanced

 

[xStampede]

Crossfire is not as efficient as you think, having 2 GPU's doesn't equal double fps. You should sell the 260x and buy a stronger GPU. 280x would do far better than 2x 260x and will consume less electricity and make less noise.