need to upgrade my gateway dx4822-1 desktop, I have 6gb of ddr2 RAM can go up to 8, e5300 processor and radeon hd 4670 graphics card. I would like to upgrade all 3 but don't know what my system can handle and not sure what is good for the money running windows 7 home premium 64 bitYou say you "need" to upgrade these 3 components of your existing computer. Why? What is it that you don't have that you feel this need will resolve?truenorthcpu and graphics card do not meet the requirements
WoW minimum requirements as of MoP patch is now Pentium D and 1GB Ram if XP and 2GB Ram if Windows 7

You have plenty of power to run it with that system. A video card upgrade would show best performance, while CPU and RAM upgrade are not critical.

I have been able to run it still with a Core 2 Duo 1.8Ghz and a GeForce 7300 Mobile in an old laptop with 1.5GB RAM and Windows XP Pro. My 2nd gaming system is a Core 2 Duo 2.4Ghz which is older than your CPU and I am running on 2GB Ram with Windows 7 32-bit and GeForce 8400GS video card with 256MB VRAM and it runs it with no issues. No lag etc on "good" graphics setting. My main system is a Athlon II X4 620 2.6Ghz with a ATI 5450HD 512MB video card and I can run ultra with 30fps, but I toned it down to high for 50-60fps.

My wife is running Pentium E5400 2.7Ghz CPU and 4GB Ram and 64-bit Windows 7 Home premium with GeForce 9800GT w/1GB VRAM and on ultra settings with 40 fps on 1024x768 resolution. Her build is closest to yours. Try just a newer more powerful video card first. You might be able to SAVE your money vs unnecessary upgrade to CPU & RAM