I built a gaming PC out of an old Lenovo surplus tower for my kid a couple years ago. It’s been a solid machine, does what she asks of it. Currently it has a 2GB GTX 960 in it that I picked up cheap from my previous employer. To power it I stuck in a molex-to-4pin power cable. It’s been working flawlessly for 2 years now.
Today I ordered a RAM upgrade for it and was poking around at GPU options. To my dismay it seems like there’s nothing that would be a cost-effective upgrade for this system. I saw a local eBay listing for some mining RX570s for $60 but they require a 6-pin. A 4GB 1050ti is barely an upgrade, and 1650s are pricey.
I’m fully aware this system is probably about to get its very last upgrade with the RAM bump, and I should plan to build something new, but I’m wondering if there are options out there I missed?
As far as my knowledge goes, you’ve given the most wise answer yourself, start looking for a complete new build. Better to keep the money now, to then make a proper build with a proper PSU that can handle the new GPU well and is ready for a good few years.