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1  Alternate cryptocurrencies / Mining (Altcoins) / My Asrock H110 Pro BTC+ caught fire on: March 15, 2018, 06:47:20 PM
Hi guys,

Today it seems I fried my Asrock H110 Pro BTC+ mobo... Damage on the 12 connected GPUs I still have to assess Sad

The connector of one of the 3 power supply cables to the mobo caught fire. Luckily I had the reflex to pull the power cord from the socket the moment I saw the flames... You can see the damage in this picture. The connector and part of the power cable have melted and the mobo is scorched.

https://www.dropbox.com/s/44e5scw4gkqxfwv/Foto%2015-03-18%2019%2022%2020.jpg

Before replacing the mobo, I want to know what went wrong. I don't want to die in a fire because my rig acts up at night.

The wiring scheme:

https://www.dropbox.com/s/vv8s1lhvuuvcojh/rig%20sata-molex.png
The red line indicates the wire that caught fire.

What happened:
- I shut down my rig using remote desktop
- After a minute, I went to check if it was really shut down in the other room. I wasn't, it was on fire.

What I think happened: the mobo shut down PSU1, together with the connected GPUs to that PSU. However, somehow PSU2 failed to shut down, still powering the GPUs.
The GPUs tried to draw power from the mobo, which was only supplied by the one power line from PSU2 which got overloaded and caught fire.

Any thoughts on this?
2  Alternate cryptocurrencies / Mining (Altcoins) / What happens when powered risers becomes unpowered? on: January 06, 2018, 11:31:37 PM
I'm running a rig consisting of 2 PSU which each power 6 GPUs (+ mobo/cpu/hdd on one).
Each GPU power lines and powered riser are linked to the same GPU, so if a PSU fails, the entire GPU will shut down (riser + power lines).

What would happen if my secondary PSU (the one with only GPUs linked) fails? I.e. 6 GPUs are only connected to the mobo using the USB3 cable to the riser, but riser power and GPU power is cut.
Will or could it harm my GPUs or mobo? How "independent" is a powered riser, power-wise? Will the GPU attempt to draw power from the mobo?
3  Alternate cryptocurrencies / Mining (Altcoins) / Undervolting RX570 doesn't stick on: January 06, 2018, 09:00:53 PM
I have several RX570s in my rig I'm atttempting to undervolt.
Using AMD Wattman, I lower the voltages to 835mV.

However!
1. HWInfo tells me the GPU core voltage never drops below 875mV. Strange, but I can live with that.
What's worse is the following.

2. The GPU completely ignores the undervolting and stays at 1.000V, EXCEPT when I manually change the undervolt to 836mV and apply in Wattman.
The annoying thing is that as soon as the GPU leaves the "busy" P7 state (at which point the clock drops to 300MHz), the undervolt setting gets reset.
Next time I start Claymore's dual miner, GPU voltage is at 1.000V again.

Can anyone explain this behaviour?
The undervolting results in 20-30W less power consumption per card, so it's important I get it right.
4  Alternate cryptocurrencies / Altcoin Discussion / [Ethereum] confirmed tx not showing up in fully synced wallet on: December 21, 2017, 06:15:05 PM
Hi guys,

I mined some Ethereum recently, using Ethermine.
A payout was sent to my address, and this transaction got confirmed:
https://etherscan.io/tx/0xcf092f1f826c3f8e6afcdbf5a2fff40d0d9eaf684b98002d06a1b052008698db

However, the balance does not show up in my Ethereum Mist wallet, although the receiving address is an account of mine.
My wallet is also fully synced, so I'm at a loss here...

Can anyone please help me out?
5  Alternate cryptocurrencies / Mining (Altcoins) / Add2PSU vs dual ATX cables on: October 17, 2017, 09:25:10 AM
Hi,

Could anyone tell me the difference between using a circuit like Add2PSU and using dual ATX cables to power on 2 PSUs?
I'd like to know this because I'll need a second PSU when adding more GPUs to my mining rig.

Add2psu:
https://www.amazon.com/Multiple-Adapter-Connector-Genetek-Electric/dp/B0711WX9MC


Dual ATX cable:
https://www.amazon.com/Main-Second-Power-Supply-Cable/dp/B00JIV9BRK


To me, they seem functionally equivalent.
I'd say the dual ATX cable would be better because there is no delay from the relay powering up the second PSU...
What is the difference? In which situation(s) would you use which setup? Are there any pitfalls?
6  Alternate cryptocurrencies / Mining (Altcoins) / Multiple PSUs for mining rig on: September 28, 2017, 03:53:26 PM
Right now I'm running a mini rig consisting of 1 GTX 980 and 1 GTX 1080 Ti.
At the moment, I've opted for a Corsair RM1000X PSU of 1000W, which can easily handle both GPUs.
However: 4 more 1080 Ti's are on their way, and my single PSU won't be able to handle those 6 GPUs.

I've read it shouldn't be a problem to use 2 PSUs for a single mining rig and using Add2PSU to switch them on at the same time.
Which second PSU would you recommend? Do I have to do something additional for them to work safely together (eg. load is balanced)?

Furthermore: what do I connect the second PSU to? Is the following a good setup?
PSU1: Mobo/CPU/HDD + main power supply to GPUs (= the 2x 8 pins on top of the GPUs) + risers of the GPUs it connects
PSU2: remaining GPUs + risers of these GPUs.

I don't want to fry 5 1080 Ti's... Smiley
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