If he really can't wait then well
The P55 chipset does not have video out.
I highly doubt a "a R150.00 power supply from the flea market" will handle an i5 and 6870!
I bet it wouldn't even have one 6pin/8pin connector, let alone the two required for a 6870.
Sure he could check that his fans spin up or what ever... But I wouldn't pay R150 for that..