Title: Rig with 4 GPU's, 2 fast, 2 slow Post by: Hi-Fish on February 05, 2021, 11:36:05 PM Hi
I' ve built a new 4 GPU rig and have a weird problem with it.... Hardware: Mainboard= Asrock Z490 (I had a CPU for it lying around) CPU= i5 10400 Ram= 2x4GB PSU= 750W Corsair GPU's= 4x Nvidia 1660 Super (2 onboard, 2 with riser) Now my problem is that i've got hashrates around 27Mhs on 2 cards (one in #1 pci-e 16x onboard, one with riser) and only 20Mhs on the other 2 cards (one in #2 pci-e 16x onboard, one with riser). Things i made/tried to solve the problem: BIOS update installed new nvidia driver, using DDU installed new chipset driver enabled/disabled above 4k decoding in the BIOS tried different miners (Phoenix and t-rex) Nothing changed... Any idea here in the forum?!? Cheers Hi-Fish PS: Temps are ok Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: miner29 on February 05, 2021, 11:38:27 PM try swapping a slow in place of a faster one.
Does the problem follow the card or stay with the slot? Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: Hi-Fish on February 05, 2021, 11:49:58 PM The problem stays with the slot(s)....
Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: miner29 on February 06, 2021, 12:59:44 AM ok make sure you have the slots to gen2 and if it offers 8x/4x/4x in bios
Are you using any m.2 drives/devices as they use pcie lanes also and can be an issue. Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: JayDDee on February 06, 2021, 03:00:59 AM Are all GPUs same brand and model with same specs?
Compare the clock, temp and voltage between the fast cards/slots vs slow. It might be simpler to focus on 2 slots and rotate all cards through both slots comparing all performance stats. Try different algorithms to see if you get the same problem. I assume you're using Windows. Try a live Linux mining OS to see if you get the same results. I find it bizarre that 2 x16 slots would perform so differently with the same card. I also find it bizarre that 2 slots would underperform identically. Shared bandwidth with other devices isn't usually an issue, x1 bandwidth is enough. I/O bandwidth isn't the bottleneck with Eth anyway, it's mem bandwidth. Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: Bitbtc8 on February 06, 2021, 06:05:35 AM The problem stays with the slot(s).... No it's not the slot......OP download GPU-Z on your PC to detect the type of memory that those GPUs are using, this is the only way we can tell you the right settings for each, also download Msi Afterburner, Open Msi Afterburner and downclock just like what you see in the image below https://i.imgur.com/Bt098qo.png Power limit = 65% Core Clock = -502 Memory Clock = -502 Fan speed = 57 This will drastically give you 30MH to 31MH per second on the graphic cards Make sure your RAM is up to 4 gig size Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: miner29 on February 06, 2021, 02:32:50 PM Some responses missed that op moved cards and the problem stays at the slot...doesnt matter which cards are there. See his response where he states the problem stays with the slot.
OP - which os the exact model mobo you have ... there are severa asus Z490’s. https://www.asus.com/us/site/motherboards/Intel-Z490/ Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: bobben2 on February 06, 2021, 03:09:03 PM Hi I' ve built a new 4 GPU rig and have a weird problem with it.... Hardware: Mainboard= Asrock Z490 (I had a CPU for it lying around) CPU= i5 10400 Ram= 2x4GB PSU= 750W Corsair GPU's= 4x Nvidia 1660 Super (2 onboard, 2 with riser) Now my problem is that i've got hashrates around 27Mhs on 2 cards (one in #1 pci-e 16x onboard, one with riser) and only 20Mhs on the other 2 cards (one in #2 pci-e 16x onboard, one with riser). Things i made/tried to solve the problem: BIOS update installed new nvidia driver, using DDU installed new chipset driver enabled/disabled above 4k decoding in the BIOS tried different miners (Phoenix and t-rex) Nothing changed... Any idea here in the forum?!? Cheers Hi-Fish PS: Temps are ok If your BIOS has an Above 4G decoding then enable it and connect your display to the onboard HDMI/VGA/DP (ie on the mobo). Also, in the BIOS, see if there is an option to select 1st gen PCIE. I think you would have better luck connecting all your GPUs via risers. If your mobo has more than 4 PCIe slots, then try to use any of the other slots. You may also want to disable ports not in use, ie serial, parallel, even disable USB. I once had a heck of a time with an AsRock Fatality Z87 board. I got it to work with 5 GPUs after a lot of trial and error. Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: Hi-Fish on February 06, 2021, 04:03:04 PM No it's not the slot...... Open Msi Afterburner and downclock just like what you see in the image below https://i.imgur.com/Bt098qo.png Power limit = 65% Core Clock = -502 Memory Clock = -502 Fan speed = 57 This will drastically give you 30MH to 31MH per second on the graphic cards You sir are my helping hand! It works like a charm ! :D Thank you so much.... You also know good settings for 1070 cards? Hi-Fish Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: JayDDee on February 06, 2021, 05:28:13 PM Some responses missed that op moved cards and the problem stays at the slot...doesnt matter which cards are there. See his response where he states the problem stays with the slot. That was the problem, everyone else believed it. Title: Re: Rig with 4 GPU's, 2 fast, 2 slow Post by: Winscosinally on February 07, 2021, 11:45:30 AM No it's not the slot...... Open Msi Afterburner and downclock just like what you see in the image below https://i.imgur.com/Bt098qo.png Power limit = 65% Core Clock = -502 Memory Clock = -502 Fan speed = 57 This will drastically give you 30MH to 31MH per second on the graphic cards You sir are my helping hand! It works like a charm ! :D Thank you so much.... You also know good settings for 1070 cards? Hi-Fish Core clock : +0 Memory clock : +800 mhz Power limit : 60% Some gtx1070 can't go over 800MHZ, some are stuck at 600mhz |