hi I tried to overclock in bios by raising the FSB but could only raise by 15 mhz till hit the line. now i have to say i have some booting problems (sometimes the monitor wont turn on) but i cant understand why i cant overclock anymore than that? so does anyone know what could cause this? the mobo is supposed to support overclocking but i wonder why i cant get past 15mhz FSB increase? here's my system: GPU: SAPPHIRE HD 4850 PCI-E 512MB GDDR-3 HDMI Mobo: ALiveXFire-eSATA2 R3.0 PSU: COMPUCASE PSU 550W 12CM ATX12V2.0 CPU: amd sempron 3400+ thanks PS. when i boot after oc the system just hangs on POST.