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Hello! I've reviewed the Dell OptiPlex 790/990 user guide which describes the new motherboard without a heat sink and a power supply heat sensor for desktop chassis. I can help you understand the new changes, BIOS requirements, and component testing described in the document and answer all your questions.
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What components are not included with the new motherboard?
What BIOS version is required for the new motherboard?
Will using the new motherboard impact system performance?