VT-d was recommended on PCs with Thunderbolt 3 ports but is now required on those with Thunderbolt 4. This is achieved using DMA remapping (DMA-r), which creates an isolated memory region for every device you connect to a system so they can only access assigned memory, not memory from the entire machine. The company claims VT-d can prevent physical DMA attacks by blocking PCIe peripherals (storage, external graphics, memory cards, etc) from unauthorized access to memory. You’ll find many docking stations and USB-C hubs can deliver 4K via HDMI, but never at 60Hz.Īs previously reported, Intel wants to reassure you (and Microsoft) that Thunderbolt 4 is secure by requiring Virtualization Technology for Directed I/O (VT-d). What does this mean? More room for higher transfer rates and better performance.įor example, those looking to connect to external monitors and get dual 4K resolution at a refresh rate of 60Hz, or up to a single 8K resolution input at a refresh rate of 60Hz, will want to seek out Thunderbolt 4-compatible laptops. However, Thunderbolt 4 stands out by increasing Thunderbolt 3’s minimum PCIe data requirements from 16Gbps to 32Gbps. You’ll find that Thunderbolt 3 delivers the same speeds, which allows data to be moved to and from external drives at high speeds and up to five Thunderbolt devices to be connected. When it comes to speed, Thunderbolt 4 ports have a 40Gbps bidirectional bandwidth. It’s the one cable connection to rule them all. Better yet, it is backward compatible with previous versions of Thunderbolt and connects via USB Type-C. Thunderbolt 4 is compatible with plenty of connections including DisplayPort, PCle and USB 4.
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