Generally, for 5 instances you'll want 16GB of RAM and a 4c/8t CPU (Intel i7 / Ryzen 5 3600) or better. You might be able to run 5 at postage-stamp settings on an i5 but I doubt it would be very enjoyable, especially on a slow i5 like that one. The 1660 ought to be enough for 1080p and lower; if you're thinking you'll be OK at 1440p or better, probably not.
[edit] updated after looking at 2600x benchmarks vs the $55 more 3600...
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