ASRock Z370 Extreme4 User Manual - Page 76
Chipset Configuration, Primary Graphics Adapter, Top of Lower Usable Dram, Above 4G Decoding
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4.6.2 Chipset Configuration Primary Graphics Adapter Select a primary VGA. Top of Lower Usable Dram Set the maximum value of TOLUD. Set this item to Dynamic to allow TOLUD to adjust automatically based on the largest MMIO length of the installed graphic controller. Above 4G Decoding Enable or disable 64bit capable Devices to be decoded in Above 4G Address Space (only if the system supports 64 bit PCI decoding). VT-d Intel® Virtualization Technology for Directed I/O helps your virtual machine monitor better utilize hardware by improving application compatibility and reliability, and providing additional levels of manageability, security, isolation, and I/O performance. PCIE1 Link Speed Select the link speed for PCIE1. PCIE2 Link Speed Select the link speed for PCIE2. 70 English