Comp issue with eVGA 7800 GT

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It really depends on who made the chipset. Some times it can even depend on the manufacture. So what is working for you with 20pins on a 24pin motherboard will not work for another setup.
 
You get lost with all these posts that don't answer the question. The memory speed will depent on the chipset you are using. It has to do with having 4 double sided ram chips, i know msi will clock down to 333. Do you have a 24pin power supply? The graphics card needs power from the mobo and the psu. A new psu is cheap enough these days anyway. I sold my old true power for 70 bucks and got the new one for 90.
 
put your old card back in your system and start from there. then check that your new mobo and cpu and psu are all working fine. then add your new graphics card and see what happens.

your psu should be plenty for the 7800gt.