He might be having minimum 450watt PSU, and that will be good for those cards.
Yes, making sure of it will help, but he cannot have anything lower than that. Thats an assumption.
PSU, you'll need at least 450 watt, or 500watt will do better.
Since he's got 2nd gen processor, it makes sense that his build is newer. And he might have minimum of 450 watt PSU.
If you dont, go for coolermaster..!!
And your budget, and motherboard model please..!!