Hey guys. Firstly thank you for your input, all these posts helped me a lot.
Im building a 1080ti rig (i want 6x).
I bought an EVGA 1600W P2 PSU. It has 9x vga power slots so i thought it will be allright but it turned out it has only 8pin->6 + (6+2) pin VGA cables. My Aorus 1080ti's have 2x8 pin slots so i dont have correct cable. In such case they advise just to use separate power cables from PSU to power each 8pin port, but this way i will be limited to 4 cards ( 2cablesx4cards=8 , and i have just 9 vga slots).
What are my options ? Return at least some Aoruses and replace them with Founders edition? (it has 6+8 pin port like my vga cable)? Buy some third party cables? Maybe use some sort of adapter?
EVGA sells "cable kits" for their power supplies - fairly cheap and same or better quality as the cables they ship with the PS, and not REAL expensive.
TDP of the Aorus appears to be around 280 watts, per what I can find in reviews of it on the net, which would be about 225 out of the PCI-E connectors. Using a "Y" cable with 2 8-pin connectors on it should be OK, EVGA cables tend to have very few issues even loaded down with ASIC machines pushing the cables to 300+ watts per cable (and those are usually due to someone trying to push 300+ watts through a 6-pin connector, which is out of spec for the connector itself much less PCI-E specs or the cable limits).
250 watts would be a 1080 Ti Founders Edition or some of the aftermarket not-highly-overclocked varients - a LOT of the Gigabyte GTX 10xx series cards are "factory overclocked" quite high with a 10% or so higher TDP limit, and the AORUS series seems to ALL be that way.
I would NOT make the "go ahead and use the Y cables" recommendation with *some* brands of power supply, however, or some REALLY HIGH TDP GPU cards.
One thing to watch closely though - 6 x Aorus at 100% ARE probably an overload for the power supply as a whole if you're pushing them hard, like most cryptocoins do. You MIGHT want to think seriously about runnning 5 of them, or going with 1 or 2 lower-level cards. Some of the reviews I saw were showing 290ish watt usage on GAMING loads at peak - mining some cryptocoins put MORE load and use MORE power on AVERAGE than most peak gaming loads can manage.
Make sure you check actual power consumption at the 4 and 5 card levels before you add the 6'th card.
There are places that sell adapters to go from a pair of 6-pin PCI-E to a single 8-pin - but those shouldn't be needed in your case.
