Biostar TZ77XE4 Setup Manual - Page 14
PEX16_1/ PEX16_2: PCI-Express Gen3 x16 x16 / x8 Nvidia SLI, and AMD CrossFireX Slots, PEX16_3: PCI-
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Motherboard Manual PEX16_1/ PEX16_2: PCI-Express Gen3 x16 (x16 / x8) (Nvidia SLI and AMD CrossFireX) Slots - PCI-Express 3.0 compliant. - Maximum theoretical realized bandwidth of 16GB/s simultaneously per direction, for an aggregate of 32GB/s totally. - The speed of PEX16_1 is x16, or x8 when SLI / CFX is enabled; the speed of PEX16_2 is x8. - PCI-E 3.0 is supported by Core i7-3xxx / i5-3xxx CPU. Note: For more details about Nvidia SLI and AMD CrossFireX, please access the website, respectively: http://www.nvidia.com/page/support.html, and http://support.amd.com/us/Pages/AMDSupportHub.aspx . PEX16_3: PCI-Express Gen2 x4 Slot - PCI-Express 2.0 compliant. - Maximum theoretical realized bandwidth of 2GB/s simultaneously per direction, for an aggregate of 4GB/s totally. PEX1_1: PCI-Express Gen2 x1 Slot - PCI-Express 2.0 compliant. - Data transfer bandwidth up to 500MB/s per direction; 1GB/s in total. PEX16_1 PEX1_1 PEX16_2 PEX16_3 12