How do you figure say 12 cards?
It gives you the option to add 8 GPUās. While not good for 12 GPUās, not all mining rigs have that many cards. It also doesnāt take much to use your own math skills to double the information 
But you can use 12 cards on the motherboards out there. And to use your own math skills then you donāt need that thing Power Supply Calculator. Because they donāt really help.
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There are motherboards with a lot more than 12 GPUās. Thatās a poor excuse for not using the site. You donāt have to use it, no one is forcing you to. But thereās no need to pretend itās not a good tool for others. I donāt know about you, but Iād prefer to fill in the hardware and not have to remember the exact wattage for every single piece of hardware known to man.
Yeah thereās the Asus 19 card motherboard but you cannot get that yet. Itās easier to take how many cards you have times there wattage, plus I use the amount of 100 watts for system. Cause I use motherboard, cpu, one stick of 4 gb ram and 1 usb for simplemining. But thatās me.
Whatever works for you 
I personally donāt want to guess. I want precise. So I use the calculator and thus far it has yet to fail me in any way. Itās a great tool. Thatās all Iām saying.
not but you can check up to 8 and if you calc how much the difference is between 4 card and 8 you just count that up with each other. itās just basic math
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Hi,
Got it up and running right now with 6 cards and have a another MSI coming next week. The system with 6 cards is only using 678 watts. I will add the 7th card next week. But I may also add a 8th card. Because it seems to have a enough power on not go above the 1440 you mention as a limit. From the readings it will use 906 watts for the system and 8 cards. That would give me a head room of 534 watts. I donāt know but with these numbers I think a 9th card could be added. This would leave 420 watts. Right now the settings are as follows -
core +100
memory no overclock
power 70%
and fans at 50%
4 of the cards are averaging 410 sols each
the very first 1x slot, the card jumps between 250 and 355 sols
the second slot on the board is the primary 16x slot, and this card gets between 200 and 250 sols. I donāt know why these two cards are doing this. Any suggestions?
Hi guys,
After reading this post, how do you determine how much core we should apply?
The answer varies by card, and by risk tolerance. In general though, sneak up on the core 25 MHz at a time or so, and do a stability test. You can use a GPU stress test as an approximation of stability, or you can just mine it for a while and get a feel for it.
Happy you got it up and running. I see that youāre running all cards on 70%TDP, and if the 678W is the power draw for the complete system, then you have a lot of spare room for inserting more cards (all cards are 1070s so far, I guess?).
I canāt really say what is happening with your two cards with less sol/s than the others, but I would try to isolate the problem systematically. You have to figure out if it is the card itself, riser problem, power-cables, motherboard and so on.
- You should double-check that your overclock settings are at least applied to the problematic cards, not only to the ones that are working ok.
- Iād then try to switch the card to a different PCI-e express slot, do a bit of mining, then switching it back. If everything works ok at a different slot, and the problem persists after switching back, then you have isolated the problem to the motherboard.
- Try a different riser.
- Try same slot, but other cards disconnected (some motherboards donāt handle multiple GPUs well).
- Check bios settings, I believe some motherboards need to have specific settings applied to allow for multiple GPUs (donāt know too much about that, though)
Bottom line, you have to try to isolate what component (or what combination of components) is problematic. Not always an easy task.
Thank you for getting back to me. All the cards are the same in this rig MSI GTX 1070 Gaming X. It seems easier to overclock if the same. I drop the TDP to 65%. Cards running a little cooler. And sols average the same. As for those first two cards, the overclocks are the same. I didnāt mention but I am using Simplemining OS. Iāll changing out the riser since I hear that they seem to be always problems with them. The motherboard is a MSI Z170-g45 it has 3 x PCIe 3.0 x16 slots and 4 x PCIe 3.0 x1 slots and 2 m.2 slots. The very first slot is a pcie x1 the next slot is a pcie x16 and primary. The bios is already been set. Simplemining on there website tells you what you need to set it to. As for multi cards they include those instructions. I will figure it out sooner or later. One thing at a time.
Thank you again And Iāll let you know if I get 9 cards running it
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Thanks for the feedback. Iām testing out and learning at the same time. I have 6x 1070s with the following settings:
Core: 165 MHz
Mem: 0 MHz
Power Limit: 106 watt
Target Temperature: 65C
Fan Speed: 48%
Temp: GPU0: 56C GPU1: 56C GPU2: 54C GPU3: 47C GPU4: 59C GPU5: 53C
GPU0: 413 Sol/s GPU1: 411 Sol/s GPU2: 402 Sol/s GPU3: 407 Sol/s GPU4: 404 Sol/s GPU5: 405 Sol/s _
Total speed: 2442 Sol/s_
Sols are around at 400 - 410 at the moment, is this a good settings? Total power drawing around 712 watts according to the power meter, of course that depends on electricity cost and etc. Just wanted to know if thatās the limit of 1070 peaking at 400 ~ish Sols and I should now focus on reducing power for efficiency.
Also, mind if I ask what is TDP, I googled it and it says it is the amount of power draw to cool down the GPU, is that correct?
Cheers!
One other fine distinction to keep in mind. As has been mentioned, PSU efficiency is one component. If your power loading is 400W, and your PSU is 93% efficient, youāll actually be drawing 400 / 0.93 = 430W from the wall (or so). The other thing I wanted to touch on is continuous power vs peak power. A vast majority of power supplies are shown with their continuous power rating (a good thing), but itās important to verify this. This is primarily a concern on cheaper units.
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Iām back and very confused. Last night I got these reading from the OS on my rig -
| GPU | Power usage | Efficiency |
| 0 | 105W | 3.45 Sol/W |
| 1 | 98W | 2.45 Sol/W |
| 2 | 114W | 3.66 Sol/W |
| 3 | 116W | 3.68 Sol/W |
| 4 | 116W | 3.62 Sol/W |
| 5 | 115W | 3.62 Sol/W |
Total - 664 watts
I went to work and let the rig stay running. I came home this morning and decided to reboot the rig which I did not do after I got the rig settings done. Well I check the readings again now I got these -
| GPU | Power usage | Efficiency |
| 0 | 164W | 2.00 Sol/W |
| 1 | 122W | 2.44 Sol/W |
| 2 | 175W | 2.51 Sol/W |
| 3 | 166W | 2.67 Sol/W |
| 4 | 183W | 2.42 Sol/W |
| 5 | 162W | 2.77 Sol/W |
Total - 972 watts
I change to overclock to 0. The power setting to 40. Temp 65c and fans 50%. And those reads I got did not change.-The only thing is my SOLās have increase about 300. I now have to try to figure out why the jump in watt usage.
So, given that the 1070s has a max TDP of 150W, the last readings seems to be with the cards on 100% power, right? OC settings might not have been applied when you restarted the rig.
I also have experienced that my OC settings wonāt be applied when the miner is running. So I have to apply the settings with the miner closed, then restart the miner again after OC settings are applied. That could be one explanation for the fact that your readings did not change after you set the power down to 40.
Try to apply the OC settings before starting any miner.
I donāt see I can do that in Simplemining OS. When you set the overclocking it reloads. No reboot. So I apply overclock and tell it to reboot. As for the miner there is no option to stop it just reload it. I am trying to figure out how to lower the power usage.
I have no experience with Simplemining OS, regrettably. I use Win10, and set OC with MSI Afterburner (auto apply OC at startup). Iāve also set the EWBF miner to open at startup.
I think you can use Win10 for mining without even activating the OS, but you can buy a Windows 10 Pro OEM license online for as little as 30 USD. Thatās what I did, and then I use remote desktop to connect to the rig if I need to do any system maintenance. If your OS keeps giving you headaches, you could at least consider Windows.
Iām using Simplemining as well, the thing I noticed is that minimum power limit would stay at 90 even if you set it to lower power, not sure whatās the reason I guess he made this by defaultā¦
If your rig is going berserk prolly you can try with another usb with fresh install?