CrossfireX and HD 4200
Be careful when trying to use the Hybrid CrossfireX function with the onboard Radeon HD 4200 card. For the 4200, you can only pair it with a Radeon 2400 series card or a Radeon 3400 series card. And that's as high as you can go. For about $60, you can get a 4650, which is better than anything Hybrid Crossfire will provide for you.