Can I use this VGA card if my motherboard only supports PCIe3 or lower?

Yes, the ASRock Challenger Radeon RX 6400 Graphics Card has an interface of PCI Express 4.0, which is backward compatible with PCI Express 3.0 and lower, so you can use it with a motherboard that supports PCIe3 or lower.

Does the VGA ASROCK|RX6400 CLI 4G R require external power connectors?

No it doesn't, it just needs to be attached to the motherboard properly

Questions & Answers: ASRock Challenger Radeon RX 6400 Graphics Card RX6400 CLI 4G

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ASRock Challenger Radeon RX 6400 4GB GDDR6 PCI Express 4.0 ITX Graphics Card RX6400 CLI 4G

4GB 64-Bit GDDR6
Core Clock 1923 MHz
Boost Clock 2321 MHz
1 x HDMI 2.1 1 x DisplayPort 1.4
768 Stream Processors
PCI Express 4.0

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