How good are the customised Radeon HD 7970s and 7950s? To give an answer to this question, we have looked in detail at the Asus, HIS, MSI, PowerColor, Sapphire and XFX releases as well as the reference cards. When heat, noise and overclocking are all taken into account, which one is the best Radeon HD 7900? > Roundup: the Radeon HD 7970s and 7950s from Asus, HIS, MSI, PowerColor, Sapphire and XFX