Was a bit slow to post this one apologies, but the Register has posted news that the PS3 has had its memory clock speed downgraded to 500/560 from the previously posted 550/700. 10% less we will see how much it makes a difference. 

There is no word on why this happened but the article continues:

"As a help to the fanbois who inevitably write in somewhat curious broken englishish every time their precious console gets re-specced in a downward manner, please cut and paste the following. It will save you at least an hour trying to figure out the parts of the keyboard that are not WASD:

You teh sux0r 2 sae teh PS3 is not going to teh r0x0r! Yew lie, yew 360 luvr. U teh sux! U maek thing up, go die!!!1111one!1!!!1 heheheheh"

Source: TheRegister