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Guessing hardware requirements

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Can anyone advise me a good minimum spec for nVidia/ATI cards to have full/good SM3.0/DX9 support? I'm looking to tell someone "we need series X or higher", or something similarly simple. I am thinking any card from the last year or 2 will do everything except the most complex functionality, which I don't need, but I need to specify something for documentation. I also need to know which Macs come with similar capabilities. I don't know anything about Macs except that the new range of MacBooks apparently have quite good GPUs... can anyone suggest which laptops/desktops would be suitable? I don't even know how they are named, i.e. how you differentiate a new Macbook to the previous generation of MacBooks. Not sure if this is the right forum... mod, please move where you think best.

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On the MacBook front, it seems the main question is if the Intel GMA X3100 GPU can cut it for 3D graphics. I believe the new MacBook and MacBook Pro are both going to be pretty powerful.

On the Mac front, I guess an iMac is the 'standard desktop' range, based on the price of a Mac Pro! I reckon the ATI Radeon HD 2600 PRO is about the minimum GPU to be decent? By decent I don't mean "plays Farcry 2" but "can render 100-200K polys without shadows but with good shader support".

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A good tactics is to check out VALVE's hardware summary. It gives you a rough idea what people currently use out there. You can then remove many cards from your spec list. A good strategy is to support certain chipsets and drop others. As an example: although I love S3's new cards, you might drop them because no one in your target group are using them. The same is true for many of the INTEL integrated graphics.

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