PC related Question!~! upgrade

Do i need a new motherboard if im trying to install a e8400(processor)(intel) but im using a pentium D (intel) already? and is it required to get a new power supply if im goin to install a 9800gt or gtx (videocard)? help im trying to install new parts into my current using pc like videocard(9800gt or gtx) , 2gb rams, and a new processor e8400 but i need to know if i need any additional parts to make it work
Answer #1
Probably. But you should write what your motherboard is. And what power supply you have.
Answer #2
is there another way instead of opening up ur pc to check motherboard and power supply? does this picture help

Answer #3
that is a Brilliant Idea.
Tell us what u have and we will tell u what Should have !
Answer #4
well the motherboard is LGA 775 so it would support the Core2 but with the power supply, you will need a new one for sure atleast 500w
Answer #5
The E8400 goes in the LGA 775 socket, so you’ll be fine. As for the PSU, you’ll need a minimum of 400W. You don’t need more, but when it comes to power, you can never have enough. Aim for a 500W to 600W PSU, but get a good quality one.
Answer #6
Try to get a nice quality power supply, coz most low cost power supplies are crap.
The Processor will fit, congrats!