Strange PCI-E speeds

janos666 · Aug 5, 2018

So, according to HWInfo,

there is a PCI-E 16x 3.0 controller with ASPM disabled running at 2.5 GT/s instead of 8 GT/s. -> Is this normal?
on this bus, there is a graphics device running at 2.5 GT/s -> makes sense if the controller is running at 2.5 GT/s
on the same bus (and card), there is a sound device running at 8 GT/s -> How so...?

A.) Shouldn't the bus be fixed at full speed when ASPM is disabled?
B.) How can the sound device report a different speed while sitting at the same controller and shares the PCI-E link?

I wonder if this is all normal, HWInfo reports something incorrectly or the machine does not behave as I would assume.

Stripped log:

Code:

HWiNFO64 Version 5.86-3480
Intel Skylake/Kaby Lake/Coffee Lake - PCI Express x16 Controller [R0] -----

 [General Information]
  Device Name:                            Intel Skylake/Kaby Lake/Coffee Lake - PCI Express x16 Controller [R0]
  Original Device Name:                   Intel Skylake/Kaby Lake/Coffee Lake - PCI Express x16 Controller [R0]
  Device Class:                           PCI-to-PCI Bridge
  Revision ID:                            7 [R0]
  PCI Address (Bus:Device:Function) Number: 0:1:0
  PCI Latency Timer:                      0
  Hardware ID:                            PCI\VEN_8086&DEV_1901&SUBSYS_00000000&REV_07
 [PCI Express]
  Version:                                3.0
  Maximum Link Width:                     16x
  Current Link Width:                     16x
  Maximum Link Speed:                     8.0 GT/s
  Current Link Speed:                     2.5 GT/s
  Device/Port Type:                       Root Port of PCI Express Root Complex
  Slot Implemented:                       Yes
  Hot-Plug:                               Not Capable
  Hot-Plug Surprise:                      Not Capable
  Slot Power Limit:                       75.000 W
  Emergency Power Reduction:              Not Supported
  Active State Power Management (ASPM) Support: L0s and L1
  Active State Power Management (ASPM) Status: Disabled
  L0s Exit Latency:                       128 - 256 ns
  L1 Exit Latency:                        4 - 8 us
  Maximum Payload Size Supported:         256 bytes
  Maximum Payload Size:                   256 bytes
 [System Resources]
  Interrupt Line:                         N/A
  Interrupt Pin:                          INTA#
 [Features]
  Bus Mastering:                          Enabled
  Running At 66 MHz:                      Not Capable
  Fast Back-to-Back Transactions:         Not Capable
 [Driver Information]
  Driver Manufacturer:                    INTEL
  Driver Description:                     Intel(R) PCIe Controller (x16) - 1901
  Driver Provider:                        INTEL
  Driver Version:                         10.1.7.3
  DeviceInstanceId                        PCI\VEN_8086&DEV_1901&SUBSYS_86941043&REV_07\3&11583659&0&08
  Location Paths                          PCIROOT(0)#PCI(0100)

PCI Express x16 Bus #1 ----------------------------------------------------


MSI GTX 1070 Sea Hawk EK X ------------------------------------------------

 [General Information]
  Device Name:                            MSI GTX 1070 Sea Hawk EK X
  Original Device Name:                   NVIDIA GeForce GTX 1070 (GP104-200)
  Device Class:                           VGA Compatible Adapter
  Revision ID:                            A1
  PCI Address (Bus:Device:Function) Number: 1:0:0
  PCI Latency Timer:                      0
  Hardware ID:                            PCI\VEN_10DE&DEV_1B81&SUBSYS_33081462&REV_A1
 [PCI Express]
  Version:                                3.0
  Maximum Link Width:                     16x
  Current Link Width:                     16x
  Maximum Link Speed:                     8.0 GT/s
  Current Link Speed:                     2.5 GT/s
  Device/Port Type:                       Legacy PCI Express Endpoint
  Slot Implemented:                       No
  Emergency Power Reduction:              Not Supported
  Active State Power Management (ASPM) Support: L0s and L1
  Active State Power Management (ASPM) Status: Disabled
  L0s Exit Latency:                       256 - 512 ns
  L1 Exit Latency:                        8 - 16 us
  Maximum Payload Size Supported:         256 bytes
  Maximum Payload Size:                   256 bytes
 [System Resources]
  Interrupt Line:                         N/A
  Interrupt Pin:                          INTA#
  Memory Base Address 0                   DE000000
  Memory Base Address 1                   C0000000
  Memory Base Address 3                   D0000000
  I/O Base Address 5                      E000
 [Features]
  Bus Mastering:                          Enabled
  Running At 66 MHz:                      Not Capable
  Fast Back-to-Back Transactions:         Not Capable
 [Driver Information]
  Driver Manufacturer:                    NVIDIA
  Driver Description:                     NVIDIA GeForce GTX 1070
  Driver Provider:                        NVIDIA
  Driver Version:                         24.21.13.9882 (GeForce 398.82)
  Driver Date:                            30-Jul-2018
  DeviceInstanceId                        PCI\VEN_10DE&DEV_1B81&SUBSYS_33081462&REV_A1\4&2D78AB8F&0&0008
  Location Paths                          PCIROOT(0)#PCI(0100)#PCI(0000)

NVIDIA GP104 - High Definition Audio Controller ---------------------------

 [General Information]
  Device Name:                            NVIDIA GP104 - High Definition Audio Controller
  Original Device Name:                   NVIDIA GP104 - High Definition Audio Controller
  Device Class:                           Mixed mode device
  Revision ID:                            A1
  PCI Address (Bus:Device:Function) Number: 1:0:1
  PCI Latency Timer:                      0
  Hardware ID:                            PCI\VEN_10DE&DEV_10F0&SUBSYS_33081462&REV_A1
 [PCI Express]
  Version:                                3.0
  Maximum Link Width:                     16x
  Current Link Width:                     16x
  Maximum Link Speed:                     8.0 GT/s
  Current Link Speed:                     2.5 GT/s
  Device/Port Type:                       PCI Express Endpoint
  Slot Implemented:                       No
  Emergency Power Reduction:              Not Supported
  Active State Power Management (ASPM) Support: L0s and L1
  Active State Power Management (ASPM) Status: L0s and L1 Entry
  L0s Exit Latency:                       256 - 512 ns
  L1 Exit Latency:                        2 - 4 us
  Maximum Payload Size Supported:         256 bytes
  Maximum Payload Size:                   256 bytes
 [System Resources]
  Interrupt Line:                         N/A
  Interrupt Pin:                          INTB#
  Memory Base Address 0                   DF0FC000
 [Features]
  Bus Mastering:                          Enabled
  Running At 66 MHz:                      Not Capable
  Fast Back-to-Back Transactions:         Not Capable
 [Driver Information]
  Driver Manufacturer:                    Microsoft
  Driver Description:                     High Definition Audio Controller
  Driver Provider:                        Microsoft
  Driver Version:                         10.0.17134.1
  Driver Date:                            11-Apr-2018
  DeviceInstanceId                        PCI\VEN_10DE&DEV_10F0&SUBSYS_33081462&REV_A1\4&2D78AB8F&0&0108
  Location Paths                          PCIROOT(0)#PCI(0100)#PCI(0001)

Strange PCI-E speeds

janos666

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