PCI-E 2.1 backward compatible>

[Rosco]

someone called up today and ask is pci 2.1 express backward compatible with pci express x16. i said yes and thought yes. but thinking about it is it?

[Xander]

First result on Google PCI-E 2.1 backward compatible (the thread title) was Wikipedia:

PCI Express 2.1

PCI Express 2.1 supports a large proportion of the management, support, and troubleshooting systems planned for full implementation in PCI Express 3.0. However, the speed is the same as PCI Express 2.0. Unfortunately, the increase in power from the slot breaks backwards-compatibility between PCI Express 2.1 cards and some older motherboards with 1.0/1.0a, but most motherboards with PCI Express 1.1 connectors are provided with a BIOS update by their manufacturers through utilities to support backward compatibility of cards with PCIe 2.1.

[Rosco]

HAHAHA I checked the whole first page execpt wiki.