Why?? Because the Geforce 6150 is a low end onboard graphics chip that sucks for gaming. You need to install a real gaming video card. The Geforce 7800 is an older gaming card that is MUCH better than the GF 6150 but it's rapidly becoming outdated. It's performance is roughly equal to the Radeon HD 4650 which is the minimum recommended card for gaming these days. Check the following article:
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