I know the bios states X300XT as the model but it's just a butchered down version of the X600 model Dell offered. The amount of memory has been reduced and the chips itself are slower types also this model runs at a lower core clock. Otherwise this an exact copy of its faster brother. Complete article on this OC here: https://sites.google.com/site/joochdoesnotcompute/overclocking/dell-radeon-x300xt