kenable 8 Pin PCI Express PCIe Power Cable from Dual 4 Pin Molex LP4 Adapter

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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. 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. 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) It is very common to find cable with dual connectors but not an Y cable, instead you get the second connector extended (daisy chained) from the first one.

8-Pin PCIe GPU Extension Cable - Reaper Cable Custom 8-Pin PCIe GPU Extension Cable - Reaper Cable

Again im a cheapskate so im only gonna swap cables under the condition of the current ones get really hot and pose a real risk of fire, and i mean burning hot not lukewarm "hot" 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 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 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.The wires can handle higher currents, up to 10-13A per wire, with reasonable heating (for example at 10A, the individual wires may heat from 25c ambient to 40c if spread out, maybe 50c in a bundle (ex under a sleeve wrapping the whole 8 wires) . They can do more if you don't mind bigger voltage drops and higher temperatures (the insulation is typically rated for at least 85c) And third you can use daisy chained cables if they are proper 16AWG daisy chained cables, if you have something like an old Seasonic unit that shipped with 18AWG daisy chained 8 pins then don't use it. The PCI-e limitation of 150 watts is chosen to allow 2 8 pin connectors on a single cable coming from power supply - keep in mind that there's ONE connector plugged into the power supply, usually with 3 or 4 pairs of 12v wires which are then shared between those 2 connectors. So, 2 x 150w max = 300w max, which is within the reasonably safety limits of the connectors on the power supply end (if the power supply is modular) I was given the case with power supply from my oncle. It's indeed old. I only found 1 cable with it. 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.

pin 8pin GPU Power Cable. Different shape and Empty pin

Additionally, some pins are used to sense the power available (there are 2 ground pins that are sense A and B). 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. You 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. 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.

That is why it is not recommended to use the cables from another PSU. In cas of doubt, you can simply plus the cable in the PSU and make sure the GND and +12V