can accept a PCIe 3.0 Graphics card, for better performance rather than the current PCIe 2.0 Graphic

[lse123]

This rather old PC HP Z440, purchased from eBay.com, see screenshots, can accept a PCIe 3.0 Graphics card, for better performance rather than the current PCIe 2.0 Graphics card... correct...?

Do you recommend replacing the existing one with a PCIe 3.0 card or, investing in a new PC...?

Or find a cheap used card a PCIe 3.0 instead? See the screenshots below...

My computer job is Full-Stack web development and coding in PHP/Laravel, Python/AI/ML/Data Science, JS/ES6+, HTML5.1 CSS3.1...
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[BeemerBiker]

Yes, you can upgrade to gen 3 and it can make huge difference.  Just verify that your power supply can handle the card and you have adequate cooling.  I had to use hybrid (liquid cooling) RX-2080ti  in my Z400

Go here and look a the K2200.  It will show %100 performance

https://www.techpowerup.com/gpu-specs/quadro-k2200.c2601

Then scroll the performance windows to (for example) the GTX-1660Ti and compare

The 1660Ti is %349 better and requires only a 300 watt supply.

The RTX-4060 is better, uses 300 watts but needs a 12 pin connector.  It will run at Gen3 speed, not Gen4 but probably needs a 12 pin power connector to work unless the OEM uses 8 pin instead of 12.  Some board OEM use different power pins.  You can always get an adapter to 12 pin.