Looking at the cards, it wouldn't be hard to think we've just taken a photo of the same card twice, but like the box the cards are almost identical. Both use the same silent cooler, both don't have any external power connector and unlike the reference card, both don't have CrossFire connectors.
The only difference between the two cards is the connectivity. The HD 5550 offers HDMI, DVI and VGA, while the HD 5570 offers HDMI, DVI and DisplayPort.
When looking at the specifications of the two models, there's not a lot to differentiate them. The HD 5570 offers a slightly higher core clock of 650MHz, while also offering 400 Shaders versus 320.
As for areas that are the same, both cards offer 512MB of GDDR5 on a 128-bit memory bus clocked at 4000MHz QDR. Anyway, let's see how the cards go when it comes to our benchmarks.