
List of IOMMU-supporting hardware

This article contains a list of virtualization-capable IOMMU-supporting hardware.
Intel based.
List of Intel and Intel-based hardware that supports VT-d (Intel Virtualization Technology for Directed I/O).
CPUs.
Server.
The vast majority of Intel server chips of the Xeon E3, Xeon E5, and Xeon E7 product lines support VT-d.
The first—and least powerful—Xeon to support VT-d was the E5502 launched Q1'09 with two cores at 1.86 GHz on a 45 nm process. Many or most Xeons subsequent to this support VT-d. 
See Advanced Search: feature=VT-d and segment=server for the full list. 
Motherboards.
Asus.
(1) 48 GB with CPU as xeon x5680 and 8GB DIMMs
AMD based.
List of AMD and AMD-based hardware that supports IOMMU. AMD's implementation of IOMMU is also known as AMD-Vi. Please note that just because a motherboard uses a chipset that supports IOMMU does not mean it is able to and the bios must have an ACPI IVRS table to enable the use of it. At least one Asus board is known to have faulty BIOSes with corrupt ACPI IVRS tables; for such cases, under Linux, it is possible to specify custom mappings to override the faulty and/or missing BIOS-provided ones through the use of the ivrs_ioapic and ivrs_hpet kernel parameters.
CPUs.
List of AMD-V and AMD-RVI capable AMD CPUs. All Ryzen processors so far (1xxx-5xxx) support it.
Server.
Dell Poweredge 710 (4 x pcie 8-way sockets. Needs end opening for 16-way cards). Successfully set up libvirt qemu with Nvidia 1650 for gaming and Nvidia 720 for Kodi running two VMs simultaneously. 7.1 HDMI passthrough and 2160p.
Tested graphics card.
List of GPUs tested on some VirtualMachine with IOMMU.
AMD.
Note: Newer AMD cards have FLR bug, that require host reboot when GPU is in undefined state. https://github.com/gnif/vendor-reset