No need to worry here at all, the 3700x is quite power efficient and even with LN2 overclocking that thing to its absolute max, it will not draw enough power to max out a single 8 pin connector.
Just plug in the 8 pin only, you will be totally fine. as for upgrading to a 12 or 16 core, only if you overclock, then maybe the extra 4 pin can bring some more stability for daily use, otherwise the 8 pin is still fine for stock use.
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Rig: Cpu: AMD R7 3700X. Mobo: Gigabyte X470 Aorus Gaming 7 wifi. Ram: Gskill Royal Silver 3200mhz cl16: Gpu: Msi RTX2070 Armor. Asus Xonar STX II.
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