8 x Gigabyte 1080Ti very low hash rate. What can be a problem?

[exacty]

Hello mates

This is my first GPU rig and I do not have much experience with rigs, but I am for sure that my has rate is too low

Cards: 8 x Gigabyte 1080Ti Gaming OC 11G https://www.gigabyte.com/Graphics-Card/GV-N108TGAMING-OC-11G#kf
Motherboard: Biostar TB250-BTC+ http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=886
Memory: 8gb
Harddrive: SSD 120gb
Power: 3 x Corsair RM1000W http://www.corsair.com/en-us/rm-series-rm1000-80-plus-gold-certified-power-supply

Tried many miners and for example I get 300-380 sol/s per card.
Nicehash performs 330-360 sol/s per card.

I am using MSI Afterburner to control the cards.
Temperatures are 55-65C
OC: core +100mhz and memory +350mhz, 100% power.
I can turn it higher, but nothing changes.

I have read, that my card should make 500-700 sol/s depending of the OC.

Have you got any idea what can be a problem?
Thank you in advance.

[Metroid]

I guess you are new to this, so here is the thing, remove the other 2 psus, remove the other 7 gtx 1080 ti, and make the test with only one gtx 1080 ti and see your hashrate, that way you will find out what is going on.

My guess is that you are using too much power, 100% at full power uses a lot of energy, set it down to 70% and check.

[gt_addict]

Yea you need to adjust your OC settings. Im currently on +200core +650-700 mem on 70% Power limit.

[exacty]

Well, I am trying to understand now

I have to decrease power to get higher hash rate? Sounds so unreal
Can anyone tell me why this power decrease rises has rate?

Just for information: I have 3000W PSU and Max load is 2300W.

I just lowered power to 80% and nothing changed in NiceHash, do I have to remake benchmarks?

[Metroid]

Like i said, try just one gpu, remove the other 7 and remove also the other 2 psu's, make sure you have the latest drivers.

[smoolae]

Well, I am trying to understand now

I have to decrease power to get higher hash rate? Sounds so unreal
Can anyone tell me why this power decrease rises has rate?

Just for information: I have 3000W PSU and Max load is 2300W.

Go into your BIOS and set PCIe Gen 2 on all if you haven't done so already. Also enable above 4G encoding.
Go back to Windows and remove all OC and put the power limit to 70% on all cards, just to start.

If no changes, do the same but only connect 1 card.

--ypsi

Was about to write the exact same thing

[exacty]

Rig is about 100km from me
I will go there in couple of days and I will test all you sayed here.

If you have any other thoughts then just write here. Then I can start trying things from the beginning.

Right now I am trying to lower power and decrease OC.

[exacty]

Wow
Just I lowered power to 70% and rig is taking only 1000W.

I thought power limit 100% is needed because GPU is working on its maximum and it needs power.

Still hash rate did not change.
Do I have to benchmark NiceHash again?

Can I OC cards as well with this 70% of power or they will be unstable, with so low power?