Re: ac3d runs slower on my new i7 than old i5
AC3D is using the Intel 4000 graphics. If you have a graphics card installed, it's not using that. I know that some PCs can switch between a built in graphics processor and a full graphics card when needed. Perhaps you can switch off this option and force it to use your more powerful card? from a quick google on Gateway i7, you may have an ATI Mobility RADEON HD 5750?
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