Kernel Panic on Mac Pro 1.1

Hello all,

This is my first post here and I hope my issue can be resolved!

Over the last month I’ve been working on this old Mac Pro 1.1. The upgrades I’ve made so far include installing OS X Lion on an SSD, installing 32GB of RAM, and soon to upgrade the CPUs to Intel Xeon x5365s. On the OS I upgraded the firmware from 1,1 to 2,1 and upgraded the SMC. I’m looking to install El Capitan once all the hardware upgrades are made.

Today, however, I’ve ran into this odd kernel panic message after I installed a Vapor-X Radoen HD 5770 graphics card (purchased used on eBay and was flashed to be compatible with Mac Pros 1,1 to 5,1/OS X 6 and newer). Upon booting a black Apple logo appears and then the kernel panic pops up.

I am not really sure what is causing the issue. I went back in to see if any cables were unplugged on the motherboard or if the graphics card wasn’t seated properly but that all looked fine. I even took the RAM out and put it back in just in case that would do anything.

Does anyone know what could be causing the problem and what can be done to fix it?

Thanks!