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Understanding integrated/low-end GPU performance for budget upgrades

My current computer is about 10 years old. It suits my current needs well enough, but in the future I'd like to do a bit more, so I'm think about some budget upgrades for CPU, motherboard and memory. Generally I don't do the sort of "gaming" that would benefit, but I have an interest in video editing.

I considered the machine mid-range when I got it, although I went with a relatively inexpensive video card. This was on top of onboard graphics (I couldn't track down a suitable CPU without).

Now that I have more experience, and a better idea of the options available to me, I'm debating between:

* Getting a CPU (or APU) with onboard graphics, and possibly setting aside my old video card;

* Getting a slightly better performing CPU without onboard graphics support, and keeping the card.

In general terms:

* Can I expect my old graphics card to work with modern budget CPUs? What specific compatibility issues might I have to look out for, or how can I research this?

* How would the power of integrated graphics on these CPUs likely compare to my old graphics card? I can easily find benchmarks for separate video cards and (by a different metric) the actual CPU performance of CPUs, but not for the video performance of integrated GPUs.

* Notwithstanding that, if I get a CPU with integrated graphics, would keeping my existing video card plugged in likely make a noticeable difference in performance? If it wouldn't, I think I might prefer to save the power draw.