Topic: Finally! 7 RX 580 + MSI Z170a mining rig (Read 1626 times)

My risers have 6 pin inputs and 6 pin to sata adapters, so I use sata power cables mainly, for them. The molex is only used to connect the PSUs.

Wow I'm such an idiot.

Perf to 4x molex, yup there it is. I was so eager to get it set up I ... honestly, I don't know how I missed it. I've looked through that bag like 10 times.

Are you using three molex's for three of the risers and then the fourth for the add2psu?

Is this the one you have?
https://www.evga.com/products/product.aspx?pn=220-G2-0750-XR

In the picture it has a perif1 port and a molex cable with it.

Huh. I have the G2 750w and they don't come with any molex. And they were $30 more expensive. Dang

I don't know TBH. But I saw a video on youtube about building an 8gpu rig using a z270 mobo.
https://youtu.be/NtxMhBWcxW0
The board is different though.

Yes, before installing the driver Above 4G Decoding must be disabled. Otherwise you can't boot into windows, it will be a black screen.

I have msi z270-a pro. Had to install all 6 cards leave decoding off. Windows shows all cards but some dont have resources. Install latest 17.6.1 then change decoding to enabled and all works. I had to unplug gpus when changing decoding because the bios went all wonky if i didnt.

I use add2psu, which basically connects the ATX connector of the second psu with a molex of the first. The psu I use are
https://www.evga.com/products/product.aspx?pn=210-GQ-0750-V1
They do have a molex cable that can be plugged into a perif1 port.

> Above 4G Decoding set to Disabled

Disabled? Weird.

Thanks for sharing and all the best!

I am in between that very same mobo and the MSI Z270 Pro Carbon. IT's just $30 more expensive. The Z270 has 6 PCI slots and 2xM.2 slots...  What do you think? Is it worth going with the newest chipset?
Cheers

Nice! I'll be setting up almost the exact same rig with the MSI Z170a Gaming M5 mobo.

Rig1
7 XFX  RX 570s
2 750W EVGA PSU's

Rig 2
5 Sapphire Nitro 470s
1 Red Devil 570
1200W (hopefully enough power after flashing), otherwise have a 1300w on backorder

Two questions:

How did you connect your two PSU's together? I ordered a ATX with molex coupling board, but didn't realize the EVGA's don't come with molex connectors.

And are you using the SATA to Molex adapters for the riders? Keep reading that it should be 4pin to molex, but again, the PSU doesn't come with those.

My first mining rig!

Hardware:

• Motherboard: MSI z170a Gaming Pro Carbon
• CPU: Intel Pentium G4400
• Memory: Corsair Vengeance LPX Black 8G
• Hard drive: Toshiba 120GB A100 2.5" Internal SATA III SSD
• PSU: EVGA 750 GQ Modular Gold Rated 80+ Power Supply x2
• GPU: Asus dual RX 580 8G * 5, Sapphire pulse 8G *2

Luckily got 5 Asus dual cards from a local store and 2 Sapphire pulse cards from an online shop (stock went out in 30 minutes).

Install:
1 Update motherboard bios, see here https://forum.z.cash/t/msi-z170-7-gpu-bios-setting-step-by-step/14473
2 Change boot option in bios to UEFI
3 Install windows (UEFI boot)
4 connect GPUs (using PCIE risers), Settings>Advanced>PCI subsystem Setting, Above 4G Decoding set to Disabled
5 boot into windows, remove any installed driver using ATI driver cleaning tool
6 Install the latest driver (17.5.2), don't need to use the hybrid driver trick.
7 Restart and enable Above 4G Decoding
8 all cards should be recognized and work fine -- it took a while for windows to get all cards set.
9 mod bios
10 Start mining

Bios mod:
stock hash rate ~23 - 24 mh/s, after modding 29ish.
1 Asus dual RX 580: does not support uber mix performance timing (tried 3.1 and 2.3). Copy 1750 strap to 2000 strap.
2 Sapphire pulse: bios from http://1stminingrig.com/best-bios-rom-for-sapphire-pulse-rx-580-8gb-oc-hynix-memory-30-mhs/

Mining speed:
Claymore's dual miner ETH+DCR, with -dcri 36 - cclock 1200 -mclock 2025 -cvddc 900
ETH hashrate ~195 mh/s, DCR hashrate ~7000 mh/s
Could go higher but I don't want to hurt stability.

power consumption:
1200 W

Misc:
1 The memory clock of 4 Asus dual, and both Sapphire can go up to 2100, but one Asus dual can only go up to 2025. Setting memory clock for individual card in Claymore did not help. In the end I had to set one mclock for all.

2 Have to use afterburner to turn on and control the fans, otherwise only the fans of the GPU connected to the monitor spins.

3 Got stuck for a while with a bizarre problem that 4 GPUs work fine but 5 will cause windows reboot. Finally found that two GPUs connected to the same PSU always turn off before Windows reboots. Turned out that the problem was caused by a faulty PSU: it was OK with low load (can boot into system and run with 1 fully loaded GPU) but higher load (two fully loaded GPUs) turned it off. Replacing the PSU solved the problem.

4 z170a is a solid board, though I don't like the LED. It can be turned off in Bios ("Turn off LED control").