Yeah I don't see the point in getting a faster card right now. You will experience a good boost going to a dual core CPU especially if you OC it, but it will still limit the card you have. My 3850 512MB was a little limited by my Athlon 5200+ X2 at it's default speeds. Of course, once I OC'd that CPU to 3Ghz I saw scores more in line with that of reviewers. Your 4830 is a bit more powerful than that so getting an even more powerful GPU will be a little futile in many games.