ATI Radeon HD 5570 Graphics card is energy efficient, low end DirectX 11 card, designed for Compact and small form factor computers @ Affordable price.
ATI Radeon 5570 features ATI Eyefinity multi-display technology, full 1080p HD playback and supports ATI Stream technology.

ATI Radeon HD 5570 Graphics Card Technical Specification:

627 million 40nm transistors
400 Stream Processing Units
20 Texture [...]

ATI Radeon HD 5450 Graphics Card features:

Experience Gaming and HD playback @ cheap price
ATI Eyefinity multi-display technology
Ultra-low power consumption
Single slot fan-cooled
Support HDMI 1.3a with Dolby TrueHD and DTS-HD Master Audio

ATI Radeon HD 5450 Graphics Technical Specification:

292 million 40nm transistors
80 Stream Processing Units
8 Texture Units
16 Z/Stencil ROP [...]

XFX ATI Radeon HD 5670 is entry level cheap DirectX11 graphics card, targeted for Multimedia, casual gamers and requires no external power supply.

XFX ATI Radeon HD 5670 Graphics Card Features:

Up to 1 GB GDDR5 RAM
40 nm Process Technology
Compliant with DirectX 11 and earlier revisions
Support for up to three displays (ATI Eyefinity [...]

ATI Radeon HD 5750 is entry level DirectX 11 Graphics Card for Basic Gaming and Multimedia functions at cheap price.
ATI Radeon HD 5750 Features And technical Specification:

Stream Processors: 800
Texture Units – 40
Core Clock: 850MHz
Memory Clock – 1.2 GHz
Graphics Memory: 1GB
Memory Bus Width – 128bit
TRansister Count – 1.04 Billion
[...]

ATI Radeon HD 5770 is mid range Graphics card with DircetX 11 Support at attractive price.

ATI Radeon HD 5770 Features And technical Specification:

Stream Processors: 720
Texture Units – 36
ROPs – 16
Core Clock: 700MHz
Memory Clock – 1.15 GHz
Graphics Memory: 1GB/512MB
Memory Bus Width – 128bit
Transister Count – 1.04 Billion
TDP [...]

ATI Radeon HD 5850 – DirectX 11 Graphics card with amazing gaming performance, HD image quality, 3D visual effects, realistic life like gaming at affordable price.
ATI Radeon HD 5850 Specs:

1440 stream processors
725 MHz GPU speed
DDR5 1000 MHz Memory
Maximum power consumption – 170w @ load and 27W when idle
Two DVI, HDMI, [...]

ATI Radeon HD 5870 offers extreme gaming performance, unrivalled image quality with stunning 3D visual effects, realistic lighting and life like imagery at very attractive price.

ATI Radeon HD 5870 Specs:

1600 stream processors
850 MHz GPU speed
DDR5 1300 MHz Memory
Two DVI, HDMI, and also DisplayPort

ATI Radeon HD 5870 Features: More than 2 teraFLOPS [...]

ATI Radeon HD 5850/5870 is upcoming DirectX 11 Graphics card based on latest 40nm manufacturing process and known as Radeon HD 5800 series.

ATI Radeon HD 5850 – Cypress Pro
ATI Radeon HD 5870 – Cypress XT

ATI Radeon HD 5870/5850 will support new Eyefinity technology which support up to three LCD display together.
ATI Radeon HD 5850/5870 [...]

Asus EAH4890 Formula is extreme performance graphics card built on ATI Radeon 4890 Graphics chip and availabe at premium price in India.
Vinay Shetty, Country Head – Components Business, ASUS (India). said “The ASUS Formula Series graphics cards are a perfect amalgamation of aesthetics and performance. Conceptualized and designed to give you that extra design exclusivity [...]

Asus EAH4770 Formula is new graphics card with innovative cooling solution and based on ATI Radeon 4770 Graphics core.
Asus EAH4770 Formula Series Graphics Card Features:

Aerodynamic Stream-line Thermal
ASUS Exclusive Formula Fansink
Native HDMI with 7.1 channel support
Microsoft® DirectX 10.1 Support
Dual-link DVI Support
PCI Express 2.0 support

Asus EAH4770 Formula Series Specification:

Graphics Engine [...]