GTX 750 Ti with powered risers - Mining rig

[zacwingfield]

Hi all,
I have an MSI Z270-Pro Motherboard and i'm trying to run 4 x GTX 750 Ti GPUs. I'm using PCIE powered risers (Ver 009 from china).

Windows 10 (64) recognises all 4 GPUs no probs but after about ten minutes of mining using NiceHash or Awesome Miner my PC either freezes requiring a hard reset or i get a message saying: "The GPU 0, 1, 2,3 appear to have shut down, attempting to restart"

ive tried sooooo many things to try and overcome this problem. My latest line of thought it this....

Power... i've got a 1000w BeQuite so i'm not concerned about that but what about if i'm not getting enough power from the PCI ports on the MoBo?

The Mobo specs say:

• 
  x2 - PCI-EX16
  PCI-E GEN 3
  x4 PCI-EX1

Am I getting enough power from the powered risers and via the USB cable that plugs into the PCIE slot to keep these GPUs running?

any thoughts on this are really appreciated. thanks.

zac

 

[AnonymousAndy]

How are you powering the risers? With what type of cable and how many?

 

[zacwingfield]

How are you powering the risers? With what type of cable and how many?

Hi, thanks for replying. Each riser is powered from the PSU with a 6pin vga cable. there are 4 risers.

I think i have worked out what the problem is.... seems obvious now... but i still welcome any thoughts you may have on this.

My PCIE slots are x1. which means they are a max of 25watt each. the GPUs run at 60watts. so i doubt the powered risers can supply the remaining 35watts required.
The GTX 750 Ti does not have its own power supply.

what do you think? is this the problem?
zac

 

[AnonymousAndy]

How are you powering the risers? With what type of cable and how many?

Hi, thanks for replying. Each riser is powered from the PSU with a 6pin vga cable. there are 4 risers.

I think i have worked out what the problem is.... seems obvious now... but i still welcome any thoughts you may have on this.

My PCIE slots are x1. which means they are a max of 25watt each. the GPUs run at 60watts. so i doubt the powered risers can supply the remaining 35watts required.
The GTX 750 Ti does not have its own power supply.

what do you think? is this the problem?
zac

No, the powered risers should be able to supply 75w to each card, the same as what the motherboard would.

 

[zacwingfield]

No, the powered risers should be able to supply 75w to each card, the same as what the motherboard would.

oh, well now i'm really stumped then. any suggestions of what to try?

zac

 

[AnonymousAndy]

ensure you have virtual memory in windows set to 17kmb.
Beyond that,
Try digging through your BIOS settings. Look for things like enable 4g encoding, PCI-E power settings, shared PCI-E settings, and disabling power savings modes.