Underclocking a Radeon 4770

Hi!

I have recently bought a Radeon 4770 and I am using the CCC the manage different profiles for managing my fan speed and the OCing the card a bit. But when the card is at idle the gpu clock drops to 250 but the memory clock remains at 800. When managing the profiles I can force it to drop from 800 to 400 but my question is this:

Would this create any problems for the card I mean the card itself doesnt drop it so it some king of forcing that could damage it from continuisly changing from 400 to 800 and reverse?
Because I switch the profiles quite often so is it safe?

Thanks for the reply.
As for the card, I tried it and it droped the idle temps from 47ºC to 42-43ºC with the memory on 400 at 30% fan speed.