Problem overclocking Fx8320 on m5a97 r2 motherboard

Who can faced or knows what the problem is. The BIOS does not allow to change the multiplier, did everything according to instructions with turning off auto overclocking etc, raised naprugu on the processor, but after pressing F10 or klavishi the comp is loaded with no image on the screen, or passes post and I get an error"error overclocking, press F1 and change the settings. Cooling is good, PSU Zalman 700 watts. Before that was mother m5a78, she worked stably at 4 GHz, it has already been given chipset.