Power, Temperature, And Noise Benchmarks
The power usage results look identical for the most part, but if you look closely you will see that the GDDR5-equipped cards use about 20 more wattage under load than their DDR3 counterparts.
Temperatures look similar too. The Gigabyte GeForce GT 220 DDR3 and PowerColor PCS+ HD5550 GDDR5 are exceptions, as both cards employ powerful custom-cooling blocks and fans. The passive, silent coolers on the HIS cards do a respectable job of keeping the temperatures low.
The passively-cooled HIS cards show off their advantage in the noise benchmark, although the PowerColor PCS+ card and Gigabyte GT 220 also do well in this arena.