The 5700 was built in the mid 2007 i think.not confirm thou.its good for the power but a little outdated technology.the power consumption isnt that much either.You would need about 450W PSU (recommended).also pls specify if ur RAM is a DDR3 or DDR2.
as for the CPU,yes its a gaming CPU.its good for the price,but if ur gonna do gaming on that rig,i would prefer an APU insted of CPU.
APUs are CPUs with a GPU built in them.
HOPE THIS HELPED. /('.')/