I'm currently on a 733MHz P3 with a 133mhz fsb, given the age and lack of bearable performance, I'm going to be upgrading to a P4@2.8 GHz with 800mhz fsb & new ram. The psu I have right now is only 250 watt and doesn't have a P4 power connector, so I'm gonna need to replace that too. My case is only a mid-tower atx, so space is kinda short, and I don't know that there's room to add more fans in unless I wanna do some modding. What I'm wondering is, if I use my old case, currently working fine only with 1 intake fan in the front and the psu as the "outtake", and upgrade to a psu with 2 fans (still be used for air expulsion), will I be ok with heat issues? I'm asking this because my dad emailed the guy he bought the comp from back in 1999 (the guy sells comps for a living), and the guy said that the old cases he used aren't "rated" to handle the large amount of heat put out by an 800mhz fsb. Most other people I've talked to say I'd be fine, but, there have been one or 2 that said I'm going to need another fan or 2...just trying get more opinions on what people think would be best.

Here are some pics if you want a better idea of what I'm talking about
http://www.fissioneffect.com/cpu/1.jpg
http://www.fissioneffect.com/cpu/2.jpg
http://www.fissioneffect.com/cpu/3.jpg
http://www.fissioneffect.com/cpu/4.jpg