Please Help. Power Supply and GPU Management

[Cynric]

Noob miner here.

I have a coolmaster 1200w Platinum Psu.

I am running 5 x Nvidia 1660 Supers ( 2 x Asus TUF, 3 x Gigabyte 6D 6G). The GPU’s pull about 350w when mining, averaging about 70w each once overclocked. These are hashing at about 30MH/s each on Nicehash.

I am unsure of the wattage pull for the motherboard (Biostart TB250 – Pro), SSD (Kingston 120Gb), CPU (4400), CPU fan and keyboard. All combined, I presume this is less than a 150w draw.

My question is, if the biostar motherboard supports 8 Gpu’s, is it safe to add an extra 3 x 1660 Super for a total of 8 Gpu’s. The combined wattage wilst mining shall be well below 800w (i.e. GPU’s =70w x 8 = 560w and Other components of 150w), however I am unsure of the impact of the GPU’s TDP values(125W). I don’t want to make the mistake of expecting more power from my PSU than I should.

In addition, beyond the Mobo, peripherals and GPU's, how many watts would the 8 riser cards pull?

I've ordered a Watt meter, but it only arrives by courier in a week's time.

Hoping to get advice from experienced miners in the meantime.

 

[Toy Machine]

Simple solution to your problem, sell me your PSU no more power draw questions

 

[Kamikaze]

Yeah you should be fine.

I run the same PSU with 4x 3080s (240W draw each) and the same mobo with similar CPU, RAM, SSD and 10x 120mm fans. My total power draw from the wall is max 1150w.

2 important parts:
- Ensure your GPU TDPs are set correctly before letting the system mine
- Ensure the PCI-E 8-pin draws no more than 150w and 6-pin no more than 75w from the PSU

 

[Cynric]

Haha First off, I aint selling my PSU bud. It's the heart of my operation after all.

@Kamikaze , thanks a lot for taking the time to advise, was getting a bit nervous as I dont want to pop the PSU.

The Asus TUF are set to 120W TDP, and the Gigabytes are set to 100W TDP. These are auto OC settings.

Cable management fully understood.

 

[Kamikaze]

You should be good then!

Do some research on the interwebs to see what OC settings others use for your GPUs and adjust yours accordingly. There's no need to run more TDP than what's needed. And they can vary between brands. Like MSI and Asus seem to require less TDP than Gigabyte for instance. That's in my experience at least.

 

[Cranky_ZA]

A mb cpu ram pulls about 50W
8x75W is like 600W so you will have about 600-700W witch is in between the 50% efficiency curve witch is perfect, your biggest concern should be cable management as pulling to much power through a cable, especially sata and molex connectors should only be connected 2 risers per sata strand or molex strand anything more will put you in a cable burn area and hurt your psu

 

[vylint]

I reckon you should be fine.
I think you should provision for another PSU if you are exceeding 80% of your total PSU wattage.
1200w*0.8 = 960w is the max I'd comfortably go to.
If you are really concerned, it is probably a good idea to get a watt meter to check how much you are actually drawing from the wall.

 

[Cynric]

Damn, I'm so f**king impressed at the amount of responses from this forum. Thank you so much gents!

@Kamikaze Shot, shall do my due research on the OC settings.

@Cranky_ZA In understanding total draw from the PSU...if the mobo and peripherals draw 50w to 150w and the Gpu's draw 75w x 8 (OC settings)...the total would be 750w that I'll work on, which is safe in the event of the gpu's crashing right. How many watts do the risers draw once powered by the molex/sata cables ? and should this be added onto the 750w?

@vylint Thanks mate, I also hope it will be fine, but wont leave this to chance of course. If I have a Platinum PSU, Ill work on 1200Wx 93% efficiency = 1136w, so off the wall, I shouldn't be drawing more than 1100w to be safe right ? Ordered my watt meter, its somewhere in the courier process. Wont take any chances until I get it.

 

[Kamikaze]

A mb cpu ram pulls about 50W
8x75W is like 600W so you will have about 600-700W witch is in between the 50% efficiency curve witch is perfect, your biggest concern should be cable management as pulling to much power through a cable, especially sata and molex connectors should only be connected 2 risers per sata strand or molex strand anything more will put you in a cable burn area and hurt your psu

Yes this is super important. Only 2 risers per sata/molex cable strand!

 

[Cranky_ZA]

On nvidia cards the total power draw is split between risers witch is like 40W till 30W on nvidia cards and the rest goes thought the pcie connector so you should see like 35W riser 40W pcie usage per card, AMD cards only show Pcie Connector power does not factor in riser power @Cynric