Kidfork

OK so i was in best buy and decided to grab the ATI Radeon 4350, i like it, but i want something a little more powerful. I was thinking the Radeon 4650. I was wondering if the Radeon 4650 Would be any better than the 4350. There Both 512 DDR2. I noticed the 4650 Doesn't need a 4-Pin Power Connector. Because i have a 480W PSU however it doesn't give the 12V of Power a High-end Graphics would need.