I have just purchased an Asus GTX295/TOP/1792 graphic card, and in the display setting it only says that I only have 896 meg of ram, Not 1792 meg of ram as it says on the box. Also in Asus Smart Doctor it show the 2 GPU and temps for these, it only shows 1 ram temp, and the other ram temp is plank. Apart from the missing ram, it work well.
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I think it only shows 896mb, because the card is actually 2 cards with 896mb, so it isnt actually running at 1792.