Pc 50 Psu

Hi I posted earlier last week on the PC 50 for my sb61g2r Reflexion PC and the 220w currently in there I believe is holding my 6800gt back.(low benchmark scores and fps drops compared to others with similair setups). So I went ahead and ordered the PC50 I am starting to think it might not be compatable now because I forgot about the R at the end =/

But the 220w psu in there has the same dimensions as the PC50 300w psu, so what other problems could I have other than size. Could it not be compatable with my MOBO? Any input is fine guys just lemme know what you think, and I will be sure to post the outcome of the upgrade for better or worse on the forums so others can have more info about the psu before they buy it.

Thanks.

if its got the wrong connector, i.e. 20 instead of 24 pin or visa versa you can get a converter for about a fiver