Summary: First, forget about Radeon HD 5570. Sometimes chip manufacturers release products that are too close to each other in price but with a huge performance difference between them. This is exactly what happens with Radeon HD 5570 and Radeon HD 5670.
The main competitor to Radeon HD 5670 is GeForce GT 240 and from the six games and simulations we ran, Radeon HD 5670 was faster in five of them, between 4% and 66.4%, depending on the program and video configuration.
Excerpt: The HIS Radeon HD5670 is a very capable card for the cheap price of only US$89 at your favorite online retailer. Although it is not a screamer, at almost half the price of a HD5750, for the moderate gamer, it could be considered quite a deal for a videocard sporting such an impressive stock cooling solution.
Excerpt: As more and more DirectX 11 games are released to the market the need for a video card that supports DirectX 11 is about to become a necessitate. The card we are going to be testing today could best be called an entry level DirectX 11 video card, with a price tag of about $90.00 if you buy this card thinking you can crack the setting to max and play all the games you want, you are going to one very upset individual.
Summary: AMD's Radeon HD 5670 can successfully improve over the aging HD 4670. It offers 20% more performance without any power increase or extra heat. This allows AIBs to build cards that are extremely quiet, in our case the HIS HD 5670 IceQ is the quietest actively cooled card that I ever tested. Such a design opens up new possibilities for media PC users who now have a chance to get a silent card that still has decent gaming performance for resolutions up to 1280x1024.
Pros: Solid performance upgrade over HD 4670, Extremely quiet, Custom design, 40 nm GPU, Support for DirectX 11, Support for AMD EyeFinity Technology, Native HDMI, Low temperatures
Cons: Fairly high price, Higher idle power draw than other HD 5000 cards, No support for CUDA/PhysX