xps 1330 question, need info fast! HELP!

hey guys, quick question. So I have been having problems with my xps 1330, of course. Its my 2nd unit and I was having problems with overheating and after a few hours dealing with dell they sent me a new motherboard but they flat out told me (after 2 hours chatting) there was no difference in any of the motherboards that are sent out other than what bios are installed at the factory. I brought it up because i know that people have been getting revA04 boards and I got another A01 board hardware revision with A12 bios...now does anyone know if this is true or not? I have my xps in parts all over and I noticed that the new board had a sticker on the bag that had the bios and h/w rev # on it, so I wanted to make sure with everyone that what dell was telling me was true before i put everything back together. thanks for the help!

 

There are some minor design changes in the h/w revisions.. mainly, some capacitors are played around with..

 

anything that would affect any of the heat issues or cpu whine(i wish right)? nice of them to lie to me.