Need advises for upgrading my PC

Hello, I'm think about upgrading my CPU and RAM for the incoimng Dragon ages game, and I have bit question regarding multi-core cpus.What would you suggest if the buget is between 300~400. duo-core or quad-core? I am using a e6300 duo-core which i brought 2 or 3 years ago and I can't say i am really happy about it. Back then there weren't much games that fully utilize the advantanges of a duo core cpu, for example, neverwinter nights 2 was poorly coded for duo-core and that results in a very low FPS even with a 9800GT video card. my question is that is the quad-core cpu kind in the same situation with the duo-core cpu back to 3 years ago? and which one you suggest me to buy?

my current pc:

e6300 duo (1.89Ghz)

9800gt(brought earlier this year)

2g ram

Check if your motherboard supports the newer LGA775 CPUs, such as a Q9400. Then, get at least 1GB more of RAM so you would have at least 3GB. Finally, if you're unsatisfied with your 9800GT, you can snag the upcoming HD5770 (its power will be between that of a 4870 and a 4890) for $200, which should run well on whatever PSU you currently have.

If you do not have a compatible motherboard, I would grab a AM3 mobo + Phenom II - which should be well under $200 and will equal the performance of a Q9400.

Well 9800GT is still pretty good at 1440x900 or lower res. And cpu is still ok. And here are the requirements for dragon age.

XP MINIMUM SPECS OS: Windows XP with SP3 CPU: Intel Core 2(or equivalent) running at 1.4Ghz or greater AMD X2(or equivalent) running at 1.8Ghz or greaterRAM: 1GB or more VIDEO: ATI Radeon X850 128MB or greater NVIDIA GeForce 6600 GT 128MB or greater DVD ROM (Physical copy) 20 GB HD space OS:

Windows Vista with SP1 CPU: Intel Core 2 (or equivalent) running at 1.6Ghz or greater RAM: 1.5 GB or more VIDEO: ATI Radeon X1550 256MB or greater NVIDIA GeForce 7600 GT 256MB or greater DVD ROM (Physical copy) 20 GB HD space

RECOMMENDED SPECS

CPU: Intel Core 2 Quad 2.4Ghz Processor or equivalent RAM: 4 GB (Vista) or 2 GB (XP) VIDEO: ATI 3850 512 MB or greater NVIDIA 8800GT 512 MB or greater AMD Phenom II X3 Triple-Core 2.8 GHz or greater DVD ROM (Physical copy) 20 GB HD space