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I7 14700k and one 8-pin ATX 12V power connector.

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Ive just built a pc using an i7 14700k cpu. The motherboard only has one 8-pin ATX 12V power connector. I keep reading conflicting info on how many watts one 8 pin psu to cpu cable can supply. Some people say 250w others say over 300w, up to 384w. Some people say only the same as the pcie cable, 150w.

Can anyone confirm a number and if one 8 pin connector is enough for the 14700. Apparently it can pull well over 300w so im getting a bit worried im going to have to change the motherboard.
 
Ive just built a pc using an i7 14700k cpu. The motherboard only has one 8-pin ATX 12V power connector. I keep reading conflicting info on how many watts one 8 pin psu to cpu cable can supply. Some people say 250w others say over 300w, up to 384w. Some people say only the same as the pcie cable, 150w.

Can anyone confirm a number and if one 8 pin connector is enough for the 14700. Apparently it can pull well over 300w so im getting a bit worried im going to have to change the motherboard.
Can confirm one 8-pin is fine
 
I keep reading conflicting info on how many watts one 8 pin psu to cpu cable can supply. Some people say 250w others say over 300w, up to 384w.
Per Molex' spec, up to 7 Amps per pin, and there are 4x 12v pins = 28amps = 336Watts. (Obviously this depends entirely on if the PSU cable is the correct AWG to carry that amount of current, but it's fairly irrelevant as if the boards VRM is only designed to pull e.g. 200W, then it should never pull more than that)

Some people say only the same as the pcie cable, 150w.
An 8pin PCI-E only has 3x 12v wires - each pin is rated at up to 8 Amps by Molex, so theoretically the limit is around 288W - however it is the PCI-E Spec that limits this to 150w.


Some great reading here:
 
If the motherboard is compatible with the new chip then I would say yes, it's fine with the one only. Why would they make a motherboard that's compatible with 14th gen chips but not enough power to run them?
 
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Can anyone confirm a number and if one 8 pin connector is enough for the 14700. Apparently it can pull well over 300w so im getting a bit worried im going to have to change the motherboard.
It doesn't pull anything like that in typical usage (TPU has it @ 155 watt average, across their 40+ application tests, here), but even then, at stock it should stay below 300 when heavily multithreaded, unless the board is running power unlocked.

The EPS12v is very solid and has a good reliability history (rather unlike the 12VHPWR :D ), don't worry about it!
 
It doesn't pull anything like that in typical usage (TPU has it @ 155 watt average, across their 40+ application tests, here), but even then, at stock it should stay below 300 when heavily multithreaded, unless the board is running power unlocked.

If running Cinebench multithread test mine will hit 240-250 watt, but for normal use way less than that (EDIT: Forgot that was with slight throttling on the silent fan profile, ~268 watt without).

Personally I'd be leery running a 14700, 13900 or 14900 CPU on a B760 board unless it had 2x8 pin CPU and decent power delivery implementation.
 
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The ATX standard used to recommend that power for that cable be on its own rail, but that was removed in ATX12v v2.3 and the reality is most power supplies only have a single rail, or 2-3 at most and that cable will be supplied on a rail which also supplies something else. The issue there being that it will be a rail with often vastly more current available, and the power supply doesnt care what that connector is rated for.

The biggest risk isnt instability, it's overloading that socket, causing damage and possible fire. Gamer's nexus tested the 14700k and theirs drew 284w from the eps12v rail which is more than the 8 pin socket is rated for. Undervolting is something i would look at regardless, but again i'd be ware of using that cpu and board combo.


These comments on reddit are what worried me.
 
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