PCIeMem is a tool designed to help you with inspecting physical memory of PCIe devices in a live system.
You can use this tool on Windows 10 x64 with Intel, AMD even VMWare machine.
This tool is composed of PCIe device Tree and Physical Memory Viewer.
PCIe Device Tree
Physical Memory Viewer
You can access all range of physical memory in 4K aligned.
* If the memory area you opened is a system sensitive area, your system would be stuck.