CPU or Motherboard upgrade?

[-Vicious-]

Hey all

a few days ago i was thinking of buying a new GFX card (Geforce 8800 512 Mb GTS)

Anyway i was thinking it over and i keep seeing people saying quad core this quad core that. And i was thinking should i just upgrade the chip?

My current stats are:

Intel pentium D 920 3.0Ghz/800Mhz/2x2MB Cache

* 1GB DDR2 memory
* 300GB Hard drive
* 256MB ATI Radeon x1300 pro graphics card

So what should i do, simply upgrade the chip or replace the entire motherboard with a quad core processor or go with my original idea of buying the new GFX card?

Also if i replace just the chip do i need to replace/upgrade the RAM or cache?

[oldkawman1]

Get CPU + GFX card, get a E6750 and a 8800GT 512MB

You Pent D is very poor for games.