I tried looking at ASRock 990FX, but none of them offers USB 3.1 Type-A & Type-C ports at the back. By 2020, all new boards will have them standard, and this 970A-G/3.1 is the only AM3+ board that is 2020 ready, plus all the used FX CPUs will become cheaper starting at $10 on my next upgrade. What an investment. Sometimes the Asus 970 PRO GAMING/AURA feels more-obsolete than this ASRock 970A-G/3.1, after trying both, because it lacks USB 3.1 Type-C. That's why I switched to ASRock. I'm open to all brands, doesn't matter the reliability.
I'm fine running at 1.51V, it doesn't run at 1.51V 98% of the time, anyways. At normal usage to idle, it averages only 1.15V, according to ASRock Extreme Tuner meter. Frequency speed is also variable.
K10 CPUs do prefer running at less than 3.8GHz, but I would be at LGA1156's Celeron G1101 single-thread level. Any K10s that can't run over 4.0GHz should be in the trash already.
Why wouldnt somthing like this work?
https://www.amazon.com/Lemeng-USB3-0-Connector-Converter-Adapter/dp/B01ABTHI7C
or even this:
https://www.newegg.com/Product/Product.aspx?Item=N82E16813998030
https://www.amazon.com/StarTech-com-USB-PCIe-Card-Connector/dp/B019Y4EGIO
Long story short youre not going to get much performance out of the old PH2 chips, no matter what frequency, and it only gets worse if you downgrade to a bulldozer/piledriver chip.