One GPU has lower hashrate than the others (GTX 1660)

[tg88]

One of my gtx 1660 suddenly started having low hashrate, after several attempts, I was unable to solve the problem.

Attempts I've already made:

1° Drivers removed with DDU and reinstalled...
2° Reset / Reinstall AfterBurner
3° Riser replacement...
4° Use another pcie slot...



Any additional suggestions to resolve this?

Rig Specs:

PSU: Corsair RM1000X
MB: AsRock H110 pro BTC+
GPUs: 8 x Galax 1660

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[philipma1957]

Your rig is underpowered.

I suggest  running six cards see if the six do 27-28 hash.

The psu is 1000 watter and even with under clock 🕰 I think you are aging the psu. As most likely you are using over 720 watts 24/7/365. Atx rigs do not like to do that.

It then short changes the mobo and your weakest card  suffers for it.

See if the card works better if you only run six or five cards on the mobo.

[rdluffy]

First try another miner, Phoenix for example, as I see you're using Claymore

If you already change the riser, check if the PSU cable is well connected to to GPU and giving enough power
Try another driver, maybe older driver than the one you're using
Clean your GPU PCI connector
Reduce the overclock of this card

These are the steps I did when I had this problem with older rigs with a lot of cards, it's a pain to deal with these rigs  
I used to have a lot of problens when Windows decided to update and mess with the entire system

[JayDDee]

The card could be thottling. Check the temperature and clock rate compared to the other cards.
I can't think of anything else that would cause a performance drop.

Insufficient power would cause the system to crash when the miner starts and a hardware fault
would cause either the card or the system to fail to initialize.

[sxemini]

One of my gtx 1660 suddenly started having low hashrate, after several attempts, I was unable to solve the problem.

Attempts I've already made:

1° Drivers removed with DDU and reinstalled...
2° Reset / Reinstall AfterBurner
3° Riser replacement...
4° Use another pcie slot...



Any additional suggestions to resolve this?

Rig Specs:

PSU: Corsair RM1000X
MB: AsRock H110 pro BTC+
GPUs: 8 x Galax 1660

And again, i don´t know why people can´t give us all relevant informations but want help  

DRIVER (version), OS (and version), OC settings (POWERLIMIT, CORE CLOCK, MEMCLOCK), TEMPS, HOW YOU OC, WHAT ARE THE CLOCK`S FROM EVERY WHEN YOU ARE MINING, VMEMORY MANUFACTURER from every card, MONITOR PLUGIN IN IGPU OR 1660?

[tg88]

Your rig is underpowered.

I suggest  running six cards see if the six do 27-28 hash.

The psu is 1000 watter and even with under clock 🕰 I think you are aging the psu. As most likely you are using over 720 watts 24/7/365. Atx rigs do not like to do that.

It then short changes the mobo and your weakest card  suffers for it.

See if the card works better if you only run six or five cards on the mobo.

I believe this is not the problem as the Rig is consuming 650 watts in total.


I've tested it with less gpus and the problem persists. I am going to test this gpu on another computer ... I think she has a problem.

And again, i don´t know why people can´t give us all relevant informations but want help 

DRIVER (version), OS (and version), OC settings (POWERLIMIT, CORE CLOCK, MEMCLOCK), TEMPS, HOW YOU OC, WHAT ARE THE CLOCK`S FROM EVERY WHEN YOU ARE MINING, VMEMORY MANUFACTURER from every card, MONITOR PLUGIN IN IGPU OR 1660?

Here is some additional information:
OS: Windows 10 PRO Version 1709.
MONITOR PLUGIN IN GPU0 1660.



I would like to remind you that this rig worked perfectly for months and the problem appeared abruptly.

[stolarzz]

Move your temp limit max to the right.