The flip side to this situation is maintaining the leadership in a two-way contest at the high-end. Every couple of months NVIDIA and ATI typically duke it out to create the fastest card possible. This results in the highest-end cards coming out first, which are then followed by the more mainstream variants. This is where we find the Sapphire Radeon X1900 GT, a card based on the powerful R580 core, but clocked down to bring the price to a more acceptable level. The X1900 GT also has 12 shader units and 4 ROPs disabled for a total of 36 and 12, respectively. And as we've just mentioned, its GPU core and memory frequencies are reduced to 575/600MHz (an XTX is rated at 650/775MHz and an XT at 625/725MHz).



Link: Hot Hardware