Is a MacPro3,1 x16 slot PCIe or ?

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I recently noticed that many mainboards have a PCIe slot just above the PCIe slot Is this considered to be the best slot for a PCIe

Slots: CPU: 1 x PCIe x16 Slot , supports modo x16* 1 x PCIe x16 Slot , supports modo x4* Chipset: 1 x PCIe x1 Slot * 1 x

multiclass spell slot calculator Primary riser cage connector, connected to processor 1 or the southbridge PCIe 3-slot riser cage* PCIe 2-slot x16 riser cage 1

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