Ok mo****as.
It's making some sense now. Basicly the problem came when the new prcoessor went in, tried to suck lots of power and the PSU couldn't handle it. When I was removing the PSU for the new one I noticed that the cable for the motherboard power was very stiff, but I just thought it was like that because it had been in for so long.
However my old man is an electrician and he was explaining to me that it might be one of the power connectors in the Mobo and that the connector pins in the Mobo will expand if they heat up too much. Then I remembered about the cable from before being allmost stuck in the board.
So my problem is the main connector for the Mobo heating up and sucking more energy, causing it to heat even more causing in power to be lost and it wanting to suck more energy.
I have the pc out and on it's side (I done this with the old chip so I could do the MoE) with the case off and I put the new chip in once again, sure enough after a while (Not as fast as before) I suffered frame drops, but not anywhere near as serious before, only down to 40fps. Then it would go back up to normal, few mins later the same again.
I put my trusty fan over the pc pointing into the main cable and left it running for about half an hour with no frame drops what soever.
So basicly i'm gunna get some electrical appliance cleaner, clean up the socket and try to fix the little pins inside the bad connector, if not then i'll ge a new mobo.
Thanks for all the help.