It's good, but the CPU consumes a lot of energy (125W TDP) and so produces a lot of heat. If you think you need the power, e.g. for gaming, than its okay. But then you should buy a case where you can place the PSU on the bottom - otherwise the PSU will get very hot or the PSU fan will speed up.
Maybe consider a less powerful but energy saving CPU like the AMD Phenom II X4 910e (65W TDP) ?
You did not list a PSU, but I would like to recommend you a quality PSU with a temperature-controlled fan. Calculate the optimal size of your PSU with this tool (add a 20% reserve):
http://extreme.outervision.com/psucalculatorlite.jsp
A solid power supply is crucial for a PCs stability !
Note that some HD5570 have 3 video outputs, but most have only 2 - it depends on the model !