Gpu riser problem

[techxnation]

I have a ASUS Maximus VII Hero. 

 

Wanting to use 4  gtx 1060s

 

If i plug just the riser with one 1060 it works. 

 

2 gpus on the mobo works. But if i then try to add another gpu via a riser, does not work. 

 

Using a CX750m psu

Tried 4 diff risers. 

Checked all connections. 

Enabled 4g decoding. 

Tried pci gen 1/2

[Chronified]

First, state the obvious: If you're running SLI that's not gonna work. 2 at a time only. 

 

Second: 750w for 4x1060? You're funny lol.

Those GPUs pull about 700w combined as it is, without any OC or the rest of the system on top (CPU, storage, fans etc). Your system is likely saving itself at the power spike during startup by not letting you do that.

Use the good-old paperclip trick on a 1 or 2 spare PSUs to see if the system works with 2 GPUs on another/other PSUs before you upgrade. 

 

Third: LGA 1150 is starting to age greatly, I wouldn't be surprised if your CPU just doesn't have enough lanes to support 3 or 4 1060s at a time (don't certain 1060/70/80 cards not work at all in x4?) 

[techxnation]

13 minutes ago, Chronified said:

First, state the obvious: If you're running SLI that's not gonna work. 2 at a time only. 

 

Second: 750w for 4x1060? You're funny lol.

Those GPUs pull about 700w combined as it is, without any OC or the rest of the system on top (CPU, storage, fans etc). Your system is likely saving itself at the power spike during startup by not letting you do that.

Use the good-old paperclip trick on a 1 or 2 spare PSUs to see if the system works with 2 GPUs on another/other PSUs before you upgrade. 

 

Third: LGA 1150 is starting to age greatly, I wouldn't be surprised if your CPU just doesn't have enough lanes to support 3 or 4 1060s at a time (don't certain 1060/70/80 cards not work at all in x4?) 

 

Hey thanks for the reply. This was meant for mining not SLI as I understand the GTX 1060 does not support SLI. I have a i7 4770k. I thought it would of worked on my PSU as others said they run 4 etc on a 750w PSU as it shows TDP on a 1060 is 120w

[Chronified]

14 minutes ago, techxnation said:

it shows TDP on a 1060 is 120w

That's for the reference model, pretty much anything that's made from a partner (Asus, MSI, Gigabyte, Zotac etc) has a "boost clock" that is enabled by default that raises TDP by a good chunk. Always include 20% power overhead on GPUs when mining. 

 

14 minutes ago, techxnation said:

I have a i7 4770k.

As for your CPU, if you check here your CPU only has 16 PCIe lanes, so....

gpu x2 = x8 + x8 cpu lanes
gpu x3= x8 + x4 + x4 cpu lanes

The CPU doesn't support 4x x4 at all. Sorry bub. 

 

Unless there's been some sort of exploit to make them run in x4 by now, I think you're out of luck with that current CPU. 

Maybe try using your integrated graphics and see if they'll at least mine in 1x8+ 2x4, maybe they just don't display when x4 is around. idk. 

Using IGP during mining is best anyways since it'll take that load off of your GPUs.

 

As for the spare GPU, just grab a crappy dell from your local buy+swap for $40 and some adapters. Make sure PSU is 200w+ on core2 systems and 250w+ on any i model (most of them are). Those are the easiest, cheapest, and most scalable way to mine IMO due to parts availability and price.

Edited December 23, 2017 by Chronified
corrections