The HIS Radeon HD 7850 IceQ Turbo retails for about $250, and based on that price it is positioned to compete with the Nvidia Geforce GTX760. The HIS Radeon HD7950 IceQX2 will cost you about $40 more and is headed against the Geforce GTX 660 Ti:

The HIS Radeon HD 7850 4GB IceQ Turbo is actually a mainstream GPU armed with 4GB graphics memory. It comes with a custom PCB and cooler and it is factory overclocked.

The card is based on AMD's Pitcairn Pro GPU, which features 16 Compute Units, 1024 Stream (shader) Processors, 64 texture units and 32 ROPs. HIS has pushed the GPU clock at 1 GHz, compared to the 860 MHz of the AMD reference card. Its memory is clocked at a 4800 MHz reference clock frequency and the card retains the 256-bit interface.

The HIS Radeon HD 7950 IceQ X² Boost Clock 3GB also features a custom PCB and cooling, and it is also factory overclocked at 950 MHz, meaning that its performance could be close to a Radeon HD 7970.

The HIS Radeon HD 7950 IceQ X² Boost Clock 3GB is based on the 28nm AMD Tahiti PRO GPU, which features 1792 shader processors. The reference Radeon HD 7950 is clocked at a 800 MHz. The Boost functionality allows the core to be clocked at 950 MHz. This could give a performance bump of 5 to 10% over the reference 7950, which is close to what you could expect from a reference Radeon HD 7970 card.