Can't get 6 GPUs working, only 5. Advise please...

[bscrypto]

I've had a 5 GPU rig up for a little while, and just got a 6th to put in. Unfortunately, every time I start to mine with 6 installed, the computer immediately powers down and reboots. Here is my config:

ASUS z270-ar
i3-6100 skylake
6 XFX rx 580 8gb
6 USB risers
8gb RAM
1500w power supply
Windows 10

I've tried each card individually, and each mines 29Mh/s by itself. I've also tried each PCI slot by itself and they each work. I have the AMD mixed drivers installed and the device manager shows everything installed. I start claymores, and about 5 seconds in the computer powers down. Any ideas at all???

[1715252490]

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[1715252490]

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[1715252490]

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[LTCbusiness]

Did you try to switch to Linux? If not you may want to try simplemining, really nice os.

[philipma1957]

or stop  trying to mine with 6 cards.

if you go thru this section  this is about the 50th  I can't do 6 but 4 or 5 work thread.

ever think  do go smaller  and not give yourself trouble.

[fanatic26]

There is nothing wrong with 6 card rigs. If the rig is powering off (not windows crashing or shutting down) then you have a power supply issue. When all 6 cards are drawing power it is too much load and will trip the PSU into restarting itself. Remember that as a power supply ages its output can slowly diminish. Depending on how hard of a life that PSU has it may just be on its last legs.

[Aureliusy]

Have the Z270- A  Had almost the same problem with 4 cards. With 5th card It would not boot.
Currenly use 6 cards with 1000W power supply and doing 440W

Update bios
Flush drivers with ddu uninstaller
enable 4G Decoding in BIOS  (its is an option in boot menu)
Set all cards to GEN1  (option advanced) This option made my PC boot again
After no boot. Remove power plug and wait until bios lights are all gone.

I Use one GPU directly on MB
Install Nvidia driver
Connect remaining  cards. Last time i did them all at once. Windows need a lot of time to  recognize all cards.
Check with GPu-Z

[fanatic26]

Yea I forgot to mention you should really be using linux with more than 4 GPUs.

[xleejohnx]

or stop  trying to mine with 6 cards.

if you go thru this section  this is about the 50th  I can't do 6 but 4 or 5 work thread.

ever think  do go smaller  and not give yourself trouble.

I agree with you.
All you see on this forum now is cant get 6th card working can't get the 15th card working help!! Blah blah
It's so easy to get a 5 card setup running and stable for weeks. Maybe one day they wil wise up and realize this

[bscrypto]

Thanks guys.  I don't think it's a power supply issue, only because when I have 5 GPUs running it only pulls 730W, adding one more should get me up to 850-900W...plenty of head room with the 1500W.  I've also tried a 1200W with the same exactly result -- 5 seconds after starting mining, direct power off and then the computer reboots.  And Aureliusy, I already had all of those settings exactly.  With more than 4 cards, mine wouldn't even post without enabling 4G.

Just a minute ago I did some treaking of the -ethi parameter within claymore, and I can now get it to work if I use -ethi 1 setting!!  But anything over 1 the computer will just power down after a few seconds of mining.  So at least I can guarantee the 6 cards, risers, USB cables, power supply, motherboard, SATA cables, etc. are all good.  For some reason the motherboard just can't handle 6 when they push 29.5Mh/s.  With -ethi 1 they get about 27.5-28Mh/s.  Not sure why it won't do full speed...going to have to do some more digging.  Sure would be nice to get a little bit more, but at least all 6 are cycling now!  I might dual-boot Ubuntu right now and give that a quick go with claymore, see if it's stable and what speeds it gets.

[Etherion]

It is your PSU! not enough juice to take the spike of 6 at once

my 8 XFX RX480m 8GB uses 2.5KW power if I dual mine. If you have 1200W also, I suggest using a paper clip and power 3 from that PSU and 3+MB from the 1500. If it still trips the PSUs then you know its not that.

[nu1mlock]

It is your PSU! not enough juice to take the spike of 6 at once

my 8 XFX RX480m 8GB uses 2.5KW power if I dual mine. If you have 1200W also, I suggest using a paper clip and power 3 from that PSU and 3+MB from the 1500. If it still trips the PSUs then you know its not that.

2500W sounds like a lot for 8 480's. My 6x Sapphire RX 570 Pulse Mini and the whole system draw 931W from the wall when dual mining with no under volting.

[NetopyrMan]

Update bios
Flush drivers with ddu uninstaller
enable 4G Decoding in BIOS  (its is an option in boot menu)
Set all cards to GEN1  (option advanced)

I Use one GPU directly on MB

THIS HELPED ME ALOT!!!

MB: Asus Z170 Pro Gaming
PSUs: evga gq 650 + evga g2 750
Gpus: evga sc 1070 black ed. 4x + 1x Asus 1080ti FE

WHAT I DID TO MAKE IT ALL WORKS:
- update bios (already done)
- all pcie in bios (pcie 1 / 16) on gen1
- above 4g decoding enabled
- LAN disabled
- 5 of 6 sata ports disabled
- usb 3.1 disabled

after hours of testing with risers....

- i realised that 1 riser is bad, so now i have 1x1070 in regular pcie16 (on gen1, like all others pcie are on gen1) rest cards in risers
- after i found and "eliminated" bad riser win found all 5 gpus ... test work incl. mining
- BUT still cannot have LAN coz it makes nonbootable into win, so now its on USB wifi dongle

now its eating 850w whole system (4*127+250+rest) so everyone who says that 1500w psu is now enough for 5-8 gpus (rx4xx/5xx or 1070), please dont say that, but still i recommend two psus (prise ofc )

[coindust2873]

I had similar issue when trying to run 6 GeoForce 1080ti OC cards on a Asus Maximus VIII Hero mobo.  I could only get 4 cards working and any time I tried to add another, it would reboot.  I had tried all of the settings from the BBT video and it did not work.  I also disabled surge protection and it did not work.  What did work was loading up MSI Afterburner and turning my power setting to 80%.  All 6 GPUs are now fully functioning.  They are all operating at around 695 sols/s.  I know at 85 power they were over 700 sols/s but I'll live with that.

[veman16]

does simple mining OS support WiFi

[leonix007]

does simple mining OS support WiFi

No, Simplemining OS don't support it.

https://bitcointalk.org/index.php?topic=1541084.2720