Power supply by processor

[ahesayo]

The Asrock x399 Taichi motherboard has a 2-section power supply for the TR4 socket processor. The processor itself is Risen Threadripper 1900X. Power on the motherboard for this processor 24+8+4 pin. Will the system be able to work stably on 24+4+4 pin 650W PSU? I am very sorry for the inaccuracies of the translation, I am Russian and I do not know English very well, so I use a translator.

[broccoli27]

Your PC will probably boot, but under high system load it might crash

[ahesayo]

The guy from whom I bought the motherboard said that on 24+8 pin without additional power, he consistently passed a stress test, but swore at the lack of additional power. power supply. His processor was 30% more powerful - 1920X

[YoungBlade]

You should run 24+8+0, and as long as you aren't overclocking heavily, you should be fine. The 8 pin EPS is rated for 230W, which is fine for a 1900X.

[ahesayo]

I'm sorry for the stupid question... I'm just really afraid of messing up.. 24+4+4 the pin works in theory the same way as 24+8, do I understand correctly?

[YoungBlade]

16 minutes ago, ahesayo said:

I'm sorry for the stupid question... I'm just really afraid of messing up.. 24+4+4 the pin works in theory the same way as 24+8, do I understand correctly?

The 8 pin EPS 12v cable is a 4+4 cable, but most boards with two separate plugs, either 8 and 4 or 8 and 8, intend you to use the primary 8 pin first. Ideally, you'd consult the manual, but if the person you bought it from ran the 8 pin solo, that's probably the right way to go.

[ahesayo]

Hm.. and what if you use an adapter with 4->8 pin? then it will come out 24+8+4 pin just right... but won't the wires from the tdp melt?

[YoungBlade]

1 minute ago, ahesayo said:

Hm.. and what if you use an adapter with 4->8 pin? then it will come out 24+8+4 pin just right... but won't the wires from the tdp melt?

The 8 pin (4+4 together into one plug) is rated for 230W of power. The 1900X is not going to draw that much power unless you really go ham on overclocking. Even then, you probably couldn't draw that much without LN2 or something extreme.

 

I would just use the primary 8 pin (4+4 together) and not introduce any adapters - such an adapter will almost certainly cause more problems than it solves, as it might cause the lone 4 pin to pull more power than it's rated for.

[ahesayo]

Thank you very much, bunny, you calmed me down <3. It's not every day you switch from i5-7500 to Threadripper..

[mariushm]

2 hours ago, ahesayo said:

The Asrock x399 Taichi motherboard has a 2-section power supply for the TR4 socket processor. The processor itself is Risen Threadripper 1900X. Power on the motherboard for this processor 24+8+4 pin. Will the system be able to work stably on 24+4+4 pin 650W PSU? I am very sorry for the inaccuracies of the translation, I am Russian and I do not know English very well, so I use a translator.

The 1900x processor is an 8 core processor, with a TDP of 95w. The peak power consumption is around 135w.

 

An EPS 8 pin connector is rated for around 300 watts of power. The 4 pin CPU connector is rated for around 200 watts.

Looking at the pictures of the motherboard, it looks like it has an EPS 8 pin and a 4 pin CPU connector. The motherboard has an extra 4 pin connector because some higher end Threadripper processors may consume up to 200-250 watts, which gets too close to the maximum 300w limit of a single connector, so it makes sense to spread the power across two power connectors and more wires.

 

So, since the 1900x uses so little power (less than 150 watts at 100% load), it's fine to power the CPU using just the EPS 8 pin connector, and leave the 4 pin CPU connector unused.  If the motherboard complains about it, feel free to use a molex to cpu 4 pin adapter cable just to put some voltage into that 4 pin connector and trick the motherboard into working.

 

The 24 pin connector is NOT used to power the processor, it's used to power pci-e slots and onboard devices (RAM, onboard audio, network etc)

 

You should try to get it working by installing the 24pin connector and the 4+4 / 8 pin connector into that 8 pin EPS connector.

 

Double check the manual of the motherboard and see if there are any notes about the extra 4 pin power connector.