Using 4 x 8pin for a direct 12VHPWR cable is quite silly, and this is why you will never see any PSU manufacturers offering a 4x8pin direct 12VHPWR cable either.

Technically, of course we can make a 4 x 8pin direct 12VHPWR cable, and charge more for this. But we just don't want to make a unless product with no benefit to our customers.

A modern PSU 8-pin port can supply 300w and more, so why are you connecting 4 x 300w (1200w) to a 12VHPWR 600w port?

Further reading:

Why are GPU adapters using 4 x 8-Pin if it is not needed in general?

Isn't it that more wires always mean better for a power cable?

Will I get more power by using 4 x 8pin in 12VHPWR?

Do I need 4 x 8pin to enable 12VHPWR 600w mode?
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