Buddy where should I fit them ??

Celeron 420 has very low TDP, and if need arises OCs above 3GHz, clock to clock it will be faster than AMD due to "Core" architecture.
27k rig is AMD na ??
ASUS M2A MX is 690V chipset mobo, integrated HD3200 graphics core of the 780G chipset is 2.4 times as fast as the 690G. Its better if not buying dedicated GPU.