MSI H57M-ED65 comes with two x16 PCI Express 2.0 slots supporting CrossFire (but not SLI) and two x1 PCI Express slots. The second PCI Express x16 slot works at x4, while the first one always work at x16. It is important to note that this motherboard does not bring any standard PCI slot and this may be a drawback if you intend to add an expansion card based on this bus.

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Figure 2: Slots.