How many processes can run on a computer?
As Many as your Memory (RAM) and CPU SPeed can handle. If you are lucky enough to purchase a newly retired NASA PC, This concern of your your will magically disappear.
Is a geforce 8800 gtx graphics card compatible with a dell dimension e520?
Yes it will fit,
you will need a 450W psu to really get the best out of your GTX
How do you adjust shared video memory?
when your system is starting press delete button you will some options with blue background. search over the first two options you will find it surely ?
What graphics card must you have if you need Pixel shader 2.0?
To support Pixel Shader 2.0, you need a graphics card that is compliant with DirectX 9.0 or higher. Most graphics cards released after 2004, including models from NVIDIA's GeForce 6 series and ATI's Radeon 9500 and above, meet this requirement. It's important to ensure that the specific model you choose explicitly supports Pixel Shader 2.0.