Just got another ATI FirePro 2460 with GDDR5 & have replaced the previous GDDR5 card which was crashing. Bought this on ebay & it said ( NEW other ) & received it in open box so probably factory refurbished or used but got a good deal. So will test it with 2 GDDR3 cards to find out if GDDR5 is the culprit or the other card itself.
Install a boot manager so that you can have an instance of windows 10 with the latest amd drivers on it without wiping out your windows 7 ultimate installation. See how that runs with the multiscreen snagit tool mentioned above. https://en.wikipedia.org/wiki/Comparison_of_boot_loaders
Wow people you really have very extensive setups from very good but old hardware, which brand was that by the way ? Always buy ASUS, it never ever dies for me. I run my PC for like 11 years already and that's really it. How do you go about that ? Change all to GDDR5. You earned it.