About three years ago, NVIDIA has issued a warning about the existence of counterfeit graphics cards and therefore asked to acquire graphics accelerators only from approved suppliers.
Assocaite writes that the GeForce GTX 660 with 4GB of onboard memory type GDDR5, which actually turns out to be well-camouflaged model GeForce GT 440 graphics processor based on generation Fermi with 144 cores CUDA. The adapter does have 4GB of memory, however, DDR3 with a lot less bandwidth.
As explained by Chinese journalists, VGA BIOS, indicating as the value of the vendor ID is 0000, and the device ID - "11C0", resulting in a utility like GPU-Z recognize the adapter as a GeForce GTX 660.
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