Hello, Alex_S :
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The Intel(R) 82GS45 Graphics and Memory Controller Hub dimensions are stated in section 22.5, on pages 235 and 236 of the Mobile Intel(R) 4 Series Express Chipset Family External Design Specification (EDS) document # 355969.
By the way, the Intel Atom(R) Processor N2800 dimensions can be found on page 21 of the Intel Atom(R) Processor N2000 D2000 Series with Intel NM10 Express Chipset Based Platforms formerly Cedar Trail for Intelligent Systems Designs Design-in Presentation document # 513947.
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We hope that this information may help you.