Based on the same GK104 processor as the GTX670, it should come as no surprise that the GTX660Ti is one of the best graphics cards available at the £200-250 price point. We've already seen what the ZOTAC GTX660Ti AMP! edition can do so today we evaluate the tweaked 'Extreme' Edition which has an increased core clockspeed of 1098MHz, 65MHz higher than the standard AMP! Edition which results in a Boost speed of 1176MHz. Coupled with with the GK104's 1344 CUDA cores, the ZOTAC GTX660Ti AMP! Extreme Edition should be a formidable piece of hardware.