Hi i'm new to this form my 1st build was

AMD Phenom II 3.2ghz x4 black E
Asus M4A87TD/USB3
Corsair 8gb 2x4 1600mhz
Seagate 500gb hdd x2
Sapphire 6950 2gb Dirt3
Thermaltake Litepower 700w
Thermaltake V6 Case
Zalman CNPS9500A LED cpu cooler

I was thinking of upgrading the motherboard to the Gigabyte 990 FXA/UD3 BUT isit worth upgrading just to use one sapphire 6950 2gb?

Of course upgrading the CPU,ram and case later.

ANY pointers will be very helpful THANKS.