I'm planning a rig with 7 zotac gtx 1070 ti amp extremes. They require dual 8 pin power input. My original plan was to use 2 corsair (RM850x, 850W, Fully Modular Power Supply, 80+ Gold Certified).
However, that PSU only has 5 8-pin connections each. If I move up to the 1000w psu, it only has 6 8-pin connections.
Do I use 6 pin to 8 pin adapters or do I need to upgrade to 1300w psu's with more peripherals?
Thanks!
Use adapter is enough for me. Just need to check the cable for 24 hours just to be sure that it not hot. If hot replug it again, till it really fit and not hot. Use good splitter.
Split 1 8pin cable into 2 8pin cables? Are there any safety or performance issues with the GPU when doing it this way?
The 1070ti should definitely not need to make full use of both 8-pin connections. However, the use of splitters still isn't guaranteed to be safe (we don't know exactly how the card distributes the load between multiple onboard power connections + power through the PCIe slot), and checking the cable to see if it's hot won't guarantee stability, either. (An extremely hot cable can tell you there's a problem, but just because you don't feel it being too hot, doesn't mean that there's no problem.)
You could, more than likely, get away with using 1x 6-pin to 1x 8-pin adapters, if you avoid exceeding one per line and per card. You could also use 2x 4-pin molex to PCIe adapters (also no more than one per line of connectors). SATA connectors are also an option, but one I would rank last.
(Don't forget about powering risers.)
You could also consider using 3x PSUs (too many points of failure for me) or look at other PSU options.