I have had HD 6670 for a few years now and looking for an upgrade. I'm on a budget of about $100-130. I bought an asus HD 7770 but I would also need to upgrade my psu because there's no connector to power the card. Any ideas on a better card that will not need to be connected to my psu? I'm not sure how big my psu is but it ran the 6670 just fine.