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 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.



Link: CDRInfo