Oh wow. That's older than I thought. This is definitely less of an issue than folks make out of it.

I cling onto my old hardware to limit ewaste where I can. I still gave up on my old sandybridge machine once it hit about a decade old. Not only would the CPU have trouble keeping up, its mostly only PCIe 2.0. A few had 3.0. You wouldn't get the full potential even out of the cheapest one of these intel cards. If you are putting a GPU in a system like that I can't imagine even buying new. Just get something used off ebay.