A sakra! Ten právě nemá interní GPU a dedikovaná GPU už může dělat problémy: http://www.tomshardware.co.uk/forum/244668-28-20pi n-power-supply-24pin-slot


"I tried to use an Antec 480W with 20-pin connector on a P5B with a 7600GT graphics card, and whilst it booted to windows without problems, any slight stressing of the video card resulted in video corruption and eventually a lock/crash.

Even with a 20-pin to 24-pin cable adapter, I had the same problem.

On other boards (nF4), with a 7800GTX installed, I did not have this problem, and was able to run with this 20-pin PSU (didn't even need the cable adapter).

The extra 4 pins supply additional power to the PCI-e slot, and I believe that it largely depends on how much power draw is required from the PCI-e slot for the graphics card (together with the capabilities of your PSU of course).

If you have a graphics card with a separate power connector, there's a good chance that you will be able to run the system with a PSU that has the 20-pin (or with the cable adapter) as the required power draw required from the PCI-e slot is generally less (my 7800GTX had a separate power connector, whereas the 7600GT did not)."