Uk Hardware: Late March Nvidia introduced its current flagship GPU, the GeForce GTX 680. Click here to read our comprehensive review. The first GTX 680 cards to hit the market in March were nothing more than reference cards with a different sticker on them. In the meantime a number of manufacturers have come with their own unique designs. ASUS sent us their DirectCU II Top version of the GeForce GTX 680, the ASUS GTX680-DC2T-2GD5. We analysed the differences with the reference card.