Thank you for your answer!

Utilisation of the GPU for acceleration is optional - ie must be selected in the programs options.

Is it known which parts of the program are really profiting from the GPU acceleration?
I've read that usually only the H.264 Encoding is done on the GPU.

With respect to processors - I would recommend Intel i5 or i7 rather than AMD processors  of any flavour. The Intel chips are much better at handling video, especially if you use the integrated HD graphics chip.

That said, would you recommend no dedicated graphics adapter and instead use the integrated Intel HD chip?

Hi

. . . . Is it known which parts of the program are really profiting from the GPU acceleration? . . .

During preview playback most effects will use GPU acceleration as required, during rendering the GPU is again used as required.

. . . . would you recommend no dedicated graphics adapter and instead use the integrated Intel HD chip . . .

In my experience, and from a lot of testing before building my latest computer, I would not use a dedicated graphics card, however that does depend on the interated graphics chipset - mine is a HD 4600.

The tight integration on the same chip means data transfer speeds are faster and quicker - there is no data transfer from processor to the data bus to graphics card with the inherent 'conversions' .

HTH

John