Hi, somewhat confused here.
The asus manual states that you need to connect a 6 pin PCIe power lead to the motherboard. If I do so, I run out of PCIe power cables for my 3080ti board.
This is the configuration:
I have a Seasonic 1200 W power supply that has a total of 5, 8pin CPU/PCIe outputs.
If I use 3 for the motherboard (CPU_12V(1)_1, CPU_12V(2)_1, PCIE_8P(1)_PWR) and then 1 additional one for the PCI_6p(1)_PWR I am left with only one and that is not enough for the graphics card.
Also, the manual says be sure to use the bundled CPU 8-pin to PCIE 8 pin adapter. Why is this necessary?
the EPS12v to pcie 8pin adapter is because even though both of those cables provide 12v power. the pins are reversed, so if you managed to plug the pcie power into the cpu power, you would be pushing 12V to ground rather than where the 12v is expected.
that is a bit troublesome yes. the vast majority of motherboards do not require 3cpu 12v cables. does the manual say why you need the 6 pin cable?
this is often for supplemental pcie power for devices that do not have pcie power connectors, you may be able to get away without using it. otherwise you may need a 1600W power supply
That is still not clear.
The power supply has 5 connectors each labeled CPU / PCIe. I presume that two of these connects directly to CPU_12V(1)_1, CPU_12V(2)_2. Another connector on the power supply needs to connect to the PCIE_8P(1)_PWR connector on the mothe3r3board. I presume THIS is the one that needs the adapter. Not the other two. Correct?
If you need a total of nine PCIe/EPS connections that’s usually dual supply or 1500-1600 W single supply. For example, two 3080 Tis at ~400 W with a 350 W Threadripper plus rest of system draw, all at stock, stands a pretty good chance of overloading a 1300 W PSU.
Generally dual supply is CPU and upper GPU on one supply and second GPU plus its mobo PCIe connector on the other. The mobo manual should have a section showing what goes where. You don’t want to mix this up as things can die if you do.
Whether or not the adapter’s needed depends on whether it’s an EPS cable (yes) or PCIe cable (no) making the connection. Not a big deal here but, generally, avoiding things like adapters and PSU cable extensions is preferred. +1 for the PSU and mobo specifics here.
Just to be clear, I will only use one graphics card here.
It would seem with all that has been said, that the cables supplied by Seasonic already are either for the CPU labeled as such) or the PCIe connector, also labeled as such. Thus no need for the adapter. They already wired the cables correctly.
Finally, do I need the pcie 6 pin on the motherboard?
assuming i am reading this correctly, (to be fair this manual is not very clear) you should connect your CPU 1 + 2 cables, but do not need to use any pcie power cables for the CPU.
those connectors appear to be for dual PSU configurations or overclocking.
please plug in CPU 1 and CPU 2, and the 24 pin, and then attempt to power it on with no other power cables connected.
I suppose I could do this but from what I gather the pcie-8 pin should be connected. They say to use the adapter for this. However, the adapter does NOT fit. The cable from the seasonic DOES fit into the motherboard. If this was incorrect then it would not go into the motherboard. So the only question is the 6pin.
please attempt to power on the machine with the two seasonic CPU cables, and the 24 pin.
i do not believe that you need the pcie-8 pin unless you are using dual PSUs. i do not believe the 6pin is requires as you have not mentioned having any additional pcie devices that would require the extra power budget.
note, you should connect your GPU now, so you can look for video output as your board does not have integrated graphics.
Hi
Ok, will do. I’m still waiting on the ram. It might arrive tomorrow.
SInce I am still in the return window, is 1200W adequate? 128gB ram 6 nvme ssd’s. IT should be, but I hate being under powered.
Thanks for your help.
your CPU is 350W, your GPU is probably 450W or less. at ~20W per drive, you should be well below the rated wattage, especially since almost no real world load fully loads all devices at once.