<html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> One other thing I've noticed: 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Hawaii XT [Radeon R9 290X] [1002:67b0] (prog-if 00 [VGA controller]) Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ 02:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Hawaii XT [Radeon R9 290X] [1002:67b0] (prog-if 00 [VGA controller]) Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+ 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cayman PRO [Radeon HD 6950] [1002:6719] (prog-if 00 [VGA controller]) Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ 02:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cayman PRO [Radeon HD 6950] [1002:6719] (prog-if 00 [VGA controller]) Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ 06:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Antilles [Radeon HD 6990] [1002:671d] (prog-if 00 [VGA controller]) Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ On the first host one of the R9s has "MSI: Enable-" wheres all three 6950s in the other host has "MSI: Enable+". I'll leave the relevance up to you :) </body> </html>