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Here is the CPU compatibility list: GA-MA78GM-S2H (rev. 1.0) | Motherboard - GIGABYTE
Since this is an AM2+ motherboard, a wide variety of AM2, AM2+, and AM3 processors are compatible. The newest/best would be Phenom II X6 series and Phenom II X4 series. Note that these are AM3 CPUs - they can work with DDR2 memory, but performance will be a little lower than with DDR3 memory.
Thank you for quick response. These processors are available in Poland, and costs 80 and 50 EUR. I am going to buy Phenom II X6.
Have a nice day.