vortical :
Well if you could somehow get this :http://pcpartpicker.com/part/amd-cpu-hdx945wfgmbox
it would be the fastest CPU available to you without upgrading your motherboard (only about twice as fast as you currently have) However it is still not nearly as powerful as the FX 6300 .
I would suggest saving up and simply buying a new CPU AND motherboard
I found this one Processor AMD Athlon II X4 740 FM2, 3.2GHz,
https://www.varle.lt/procesoriai/procesorius-amd-athlon-ii-x4-740-fm2-32ghz-4mb.html Just check the picture link is in my langauge but check the picture will this one work? And Processor AMD FX-4350, socket AM3+, 64bit, 4,2GHz, 125W, cache 12MB it says AM3 and my motherboard can support AM3 how about this one?