can radeon pcie 2.1 graphic card work on a pcie 1.0 input?

DestreKnights

Reputable
Dec 20, 2015
7
0
4,510
i'd like to change the graphic card in my cpu but i cant find many pcie 1.0 graphic card so i thought of buying the
XFX Radeon HD5450 1GB DDR3 ATI PCI E Graphic Card - HDMI/DVI/VGA OUTPUTS

Specification

ATI Eyefinity technology with support for up to three displays - only supported on HD-545X-ZAF2 with DisplayPort
ATI Stream technology
Designed for DirectCompute 11 and OpenCL
Accelerated Video Transcoding (AVT)
Compliant with DirectX® 11 and earlier revisions
Supports OpenGL 3.2
ATI Avivo™ HD video and display technology
ATI PowerPlay™ technology
PCI Express® 2.1 support

and i've heard that there isn't much backward compatibility in pcie 2.1 with 1.x.
So can someone confirm that this card does work on the pcie 1.x and if not are there any other great graphic cards?