Regardless of how high-end graphics card SKUs fare in the markets, it’s the cost-performance “sweetspot” SKUs ($150-$250), that provide bread and butter to GPU makers.As NVIDIA readies new GPUs for this segment in its GeForce GTX 600 series, AMD wants to make the most out of its current offerings. As part of its efforts, it recently altered the reference clock speeds of SKUs such as HD 7750. ASUS is ready with a new custom-design graphics card targeting select markets (Greater China region is one such market), which offers factory-overclocked speeds and