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The two names is both "ATI Radeon HD 4800 series", when I get them name with WMI or D3D interface.How can I determine them?

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Searching through the PCI device/vendor list, there seems to be no difference and also a single "ATI Radeon HD 4800 series" item.

I would suggest though that there has to be a difference in hardware IDs (probably at the subsystem level), which you should be able to access through WMI. You can verify this difference by using Device Manager -> right-click on display adapter -> Properties -> Details -> Select "Hardware IDs" from the drop-dow box.

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