Cable Matters makes decent adapters in this category. Between them and the SATA PCIe adapters I have a "jerky attitude" that would make many system builders swoon. They have withstood many months of use and there is little to no heat under the digital thermometer. If you're familiar with the standard, 6-pin and 8-pin PCIe have the same number of power pins. The -pin connector adds only two ground pins, one of which can act as a touch pin. From an electrical point of view, you shouldn't have any problems with these types of adapters, and the GPU manufacturers even put them in the box.
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