AMD Radeon 7950 Overclocking/Crossfire Mode Help

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Can you put two of the exact same 7950's together and do crossfire mode? The motherboard I have is a "Gigabyte GA-B75M-D3H" The 7950 Model I have is
"HIS 7950 Fan 3GB GDDR5 PCI-E DVI/HDMI/2xMini DP"
the link is here:

http://www.hisdigital.com/un/product2-679.shtml

But if I was to buy another graphics card to do crossfire mode, will I need to buy the 7950 from the same company? (HIS) or can I get one from "ASUS" for example? How do I know if my MotherBoard is big enough to fit 2 graphics cards in? The size of my 7950 is : Card Dimension: 12.6 x 4.2 x 27.8 cm

Also, if I was to overclock my Single 7950 that I have now, what should I clock it to? The GPU is at 800Mhz at the moment, I havent changed anything.

Thanks for you help! :) I really really appreciate it :D
 
Solution
You can Crossfire any 7950's together (as well as probably 7970's). They do not need to be the same brand.

The only thing is that if you buy a 2GB 7950, and you pair it with the 3GB one, you will only be able to use 2GB.

Make sure you also have a sufficient power supply for the job if you do decide to CFX.
You can Crossfire any 7950's together (as well as probably 7970's). They do not need to be the same brand.

The only thing is that if you buy a 2GB 7950, and you pair it with the 3GB one, you will only be able to use 2GB.

Make sure you also have a sufficient power supply for the job if you do decide to CFX.
 
Solution