The processor is extremly holding back your GPU. I'd suggest upgrading your bios to F15 and buying an X4 965. Or buy a new motherboard 4GB DDR3 and an i3. You'd be looking at around $250 depending on the motherboard you get.
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR12.TRC2.A0.H0.Xx4+965&_nkw=x4+965&_sacat=0
My suggestion if you go the new cpu,ram,mobo route.
http://pcpartpicker.com/p/x8CNYJ
Well the BIOS stands for Basic Input/Output System, it just checks over the hardware quickly to make sure the computer is functional before the OS loads, this is called POST (Power on self test).
Within the BIOS you get "basic" (as the name suggests) controls such as boot order, drive mode (ahci, raid, ide), and the time. You can also have more advanced features such as CPU core control for overclocking. The BIOS is stored on ROM (Read Only Memory) and can be found on the motherboard as a small chip.
On modern motherboards we use what is called UEFI, which is Unified Extensible Firmware Interface. It takes a lot of the 'features' of a BIOS but when hardware data is collected on POST it passes it to the (UEFI based) OS. Just better boot times and stuff. UEFIs generally also feature a graphical interface with mouse pointer control.
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