Im trying to connect 3 GPUs with a 125W power limit to the same PSU. The PSU only have one 8-pin connector for what i can see. You can have pci-e 8 pin to 2 x pci-e 8 pin adapters - these would be your best bet. You know the input can take nearly 300w and then you have 2 8 pin connectors, so lots of wires between the input and output. Yeah, this image was posted by Seasonic, because their older units shipped with inadequate cables which couldn't handle daisy chained 8 pins. PCI-e organization imposed the limits of 75 watts for the 6 pin connector, and 150 watts for the 8 pin connector. Unfortunatelly it's not true that you cannot connect PCIe 8-pin plug to EPS-12V (EATX) motherboard slot. It might be only an exception found with FSP PSU, but a single difference in one male pin on PCIe connector allows to plug your PSU totally wrong.

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I was using this image as reference, probably wrong for what you say... although i been using 2 GPUs with the same cable.... i can run a 150w gts 250 just fine with molex - sata - 6+2 pin adapter, you can say its gonna catch on fire all you want but unless the cables get really hot and actually pose a risk of catching fire you arent gonne convince me, atm even if i stress it the cables seem to only get w arm, from what i can tell its around low 30c in temp Ryzen 9 5900x | Full Custom Water Loop | Asus Crosshair VIII Hero (Wi-Fi) | RTX 3090 Founders | Ballistix 32gb 16-18-18-36 3600mhz Ryzen 7 3700x | Asus B450-F Strix | 16gb Gskill Flare X 3200mhz | Corsair RM550x PSU | Asus Strix GTX1070 | 250gb 860 Evo m.2You can have 2 x molex -> pci-e 8pin ... each molex has only one 12v wire, and each molex is rated for 5A of current, so in theory your adapter would be good for 2 wires x 5A x 12v = 120 watts. So in theory, an pci-e 8 pin connector that has 3 pairs of wires carrying 12v to the video card could deliver safely around 9A through each pair. This means you could do up to 12v x 3 pairs x 9A = 324 watts.

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The card will work, however pulling over 8 amps through 18 awg cable is not advisable. The cable/connectors will heat up during longer game sessions. You can't connect male PCI-E 8-pin to EPS-12V because 2 male pins on PCI-E as the top edge joined together and the corresponding pins on PCI-E does not have a slit for that.video cards don't take all power from the 8 pin connector. They can also take up to around 65w from the SLOT. (officially it's 10w on 3.3v and 65w on 12v but recently I think they loosened the standards to allow up to 75w on 12v) Some PSU maker could use a different pinout on the PSU, so even if the pinout is standard from the GPU side, it is not from the PSU side. Here's a much bigger/better picture of them taken from the computer hardware chart done by Sonic840 on Deviantart ( CC BY-SA)

How many watts an 8pin can support? - Linus Tech Tips How many watts an 8pin can support? - Linus Tech Tips

IF your power supply has only one 8 pin connector, the first thing you should do is to look at the label of the power supply and see how much current the psu can actually supply on 12v (doesn't matter how many adapters you have, if the power supply can only produce 250-300w on 12v) and second ask yourself if you trust the power supply to not lie about its capabilities on the label. If it's from a brand with decent reputation, chances are it's not lying. If it's some cheap model or some chinese psu that came with the case, most likely the psu is inflating the numbers. The PCIe 8 pin connector has 3x 12v wires. The extra is a sense wire such is why not all of the pins on the PSU side need to be populated.I've just bought an RTX 3080 TI from marketplace and the person gave me his power cable (top) that came with his power supply and I realized it doesn't fit with my power supply since there are different shapes. I used my old power cable for my GTX 1060 6GB, but there's 1 empty hole. I'm not sure what are the difference, but I'm kind of worried that the RTX 3080TI require all 8 holes to function correctly. Do I need to get a new Power Supply for the right pinned cable or why are there differences? The pci-e slots are powered by the only 2 (if my memory is correct) 12v wires in the 24 pin connector. So, assume around 200 watts can go into the motherboard through the 24 pin connector, which are then split between fan headers, rgb headers, and possibly 12v to 5v / 3.3v dc-dc converters on the motherboard that may power things like ram, m.2 connectors (m.2 has only 3.3v but because a m.2 SSD may go up to 3A when writing, some motherboards don't use the 3.3v from PSU but use a dc-dc converter to produce clean 3.3v from 12v) Second all holes do not need to be populated on the power supply side. 8 pin can 100% function with just 6 pins being used on the power supply side, because two of the pins are just for sensing ground. How do you measure the cables to be 16 AWG? I've seen this online and thought I should probably get a 2nd PCIe cable since I'm currently using the last bottom picture one by splitting. Only thing is that I can't find a single cable compatible with my Antec power supply, so I'm wondering if I'm fine or I should change power supply. You can't connect male EPS-12V to female PCI-E 8-pin because 1 male pin of EPS is square and its rounded on PCI-E.

HotTopStar PCI-Express PCIE 8 Pin to Dual 8 (6+2) Pin

I'm not sure which brand the PCIe cable is, but it's written 18AWG. Do I really need a 16 AWG? If so, I guess i'll have to buy a new Power Supply since I can't seem to find a new cable. I used a splitter to get to the three GPUs and im aware that the maximum power recommended its arround 290W. WARNING: Due to the electrical pinout of each cable and the unique electrical pinout designed for your power supply, using this cable with a non-certified or unsupported power supply may cause irreparable harm to your power supply, cable, and/or any connected devices. Use of this cable with any non-certified or unsupported EVGA power supplies or power supplies from another manufacture voids the warranty for this cable, and may void the warranty of your power supply. Furthermore, EVGA expressly disclaims any damage caused by or attributed to use of this cable with any power supplies that are not certified for use with this cable. If you get a real high end card. using true 6+2 Y cable gives you all the power you need, else the card could throttle to low power mode. Not sure where those numbers are from, but a 6-pin is rated for 75w and an 8-pin is rated for 150w.I have a Antec 850 w - High Current Gamer ATX12V/EPS12V. I had a friend that came by with his Corsair cable and it indeed not fit. It seems that all the bottom pins have a bevel on the bottom and won't accept the square ones. This power supply have 2x 12v connectors. If it doesnt catch on fire then id consider it fine but a setup like this is def risky, if your adapter or psu has thin wires then thats when you should consider swapping out the psu or just getting power from other stuff like molex to 8 pin adapters