rhel7: system boot stops with "Hardware error from APEI Generic Hardware Error Source: 0"

Issue

• Trying to boot RHEL7 stops with: "Hardware error from APEI Generic Hardware Error Source: 0"
• While RHEL6.5 installs ok on my system, booting RHEL7 ends with this:

{1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 0
{1}[Hardware Error]: APEI generic hardware error status
{1}[Hardware Error]: severity: 1, fatal
{1}[Hardware Error]: section: 0, severity: 1, fatal
{1}[Hardware Error]: flags: 0x01
{1}[Hardware Error]: primary
{1}[Hardware Error]: fru_text: UncorrectedErr
{1}[Hardware Error]: section_type: PCIe error
{1}[Hardware Error]: command: 0x0010, status: 0x0146
{1}[Hardware Error]: device_id: 0000:00:00.5
{1}[Hardware Error]: slot: 0
{1}[Hardware Error]: secondary_bus: 0x00
{1}[Hardware Error]: vendor_id: 0x19a2, device_id: 0x0710
{1}[Hardware Error]: class_code: 000002
Kernel panic - not syncing: Fatal hardware error!
Rebooting in 30 seconds..