I just installed it - I took power from SATA power cable and attached the new cable (2xSATA>PCIe), no problems so far.
If you want more power, you can install new ATX psu and use the 8300 Elite-specific power cable adaptor, look for "24-Pin to 6-Pin Power Adapter Cable Modular Power Supply Cable...
Great work so far, Sniki!!
I just finished my Customac build, 10.15.3 on HP8300 Elite, i7-3770, 16GB RAM, 256 Gb SSD and RX 580 8GB.
The only problems I encountered were the mic, proper ssdt creation (solved thanks to @LisaAlterEgo posts here) and there's an issue with audio, I get some random...
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