Ivy Bridge has integrated PCIe root ports (on die), and ACPI handles ASPM (Active State Power Management) differently across microarchitectures.
Examples: i7-3770, i5-3570, Xeon E3-12xx v2. acpi genuineintel---intel64-family-6-model-58
Even a decade later, you will still see this string in Windows Device Manager or Linux system logs. It serves as a reminder of a period where Moore’s Law was in full swing. These processors were so robust that many are still in use today for basic office work, home servers, or budget gaming builds. Ivy Bridge has integrated PCIe root ports (on