Annoying basic question about GTX 1080 ti GPU power supply

So, scored my new (previously loved, hopefully not mined to death) 1080 ti, but it came without cables so I’m trying to figure out which ones I need, or if I need to upgrade my PSU. Lockdown is a bitch: no shops to go to for advice. Nvidia specs (and eyeballing the card) say I need 1x8 pin connector and 1x6 pin connector into the card, but my PSU only outputs 2x6 pin (enough watts tho, 620) I’ve found a 6-to8 connector, but for the 6-to6 can I use a 6-to-8 pin connector and lop off two pins, a

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