i built a computer eight years ago and i need to make some upgrades if they will accomplish my needs.  really don't want to buy a new computer.
 
reason for upgrading is my computer will not play videos from my gopro. not talking about editing them yet, just simple playback. 

the gopro will go up to 1440p resolutions but mainly 1080p at 30fps is what we are talking. 

i assumed it was my graphics card. stopped in my local tiger direct store to buy a new one and the guy told me that wasn't my problem. after i described my hardware he reminded me i had a eight year old computer which i had never thought about. time flies.

so i have a core 2 duo e6600
2GB DDR2 800 ram
geforce 7900 gs graphics card

if i jump to 8gb ddr2 pc28500 speed and snatch up a core 2 quad and keep the same graphics card will this be enough?
will you confirm that the jumpy playback of video files is not because i need a better gpu and is fact due to other hardware issues?
thanks.

I suggest trying to play the gopro video files with VLC. I highly doubt that you have any hardware problems. I still have a side computer made from a e8400 and 4gb of ram.

well i use VLC 99% of the time.  after the last quicktime update it stole the permissions so I was actually using quicktime.  i didn't have time to reset the permissions.  i will go back and see if it runs better with VLC.  
 
the main thing i wanted to confirm was what i was told at the tiger direct store.  when playing a raw video file like this, is there really more work for the CPU than the GPU?  I had the general feeling that yall are saying; even though my computer is eight years old, it should be more than capable of playing an HD video.

good old VLC saved the day.  plays smooth as silk.  
 
i would have thought quicktime would have been ok since it is an apple product but obviously not.
 
on the bright side i discovered i have a great setup for overclocking so i will be playing around with that.
 
thanks for the help