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Author Topic: Pci-e GPU makes all mining slow.  (Read 154 times)
JordanLTU
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January 12, 2018, 11:56:21 PM
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Hello guys, so long story short I have mini rig with 2x1070 and 1080. 1080 is on top water-cooled closed loop. 1070s are evga acx. So middle card got no air to breathe. I decided to buy riser and take my bottom card even lower(at board in full tower case) , move middle one by 1 slot to make some room between cards. So I connected bottom one  to bottom pci and moved it closer to psu, moved the middle one as well. All looks good. Few freezes and eventually system starts. Card gets recongnized after few mins, done DDU, reinstalled GPU drivers. Problem is then I'm mining even desktop lags a lot and mining performance is like 10 times slower on all cards. Cards stays basically in Idle clocks too. Tried updating chipset drivers, setting bios default, pci gen 1/2/3 nothing helps. Could Windows reinstall help? Maybe it has to be installed while that pci-e card connected? I'm out of ideas. For now I put cards back to sandwich, obviously middle one can only be used while I set 75w limit, even with that it goes to 75 degrees of celcius. MB p9x79 pro. 4930k. Any help appreciated. Maybe someone could offer some live Linux which requires minimum settings before I can try mining and check performance? Thanks again.
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January 13, 2018, 02:08:36 AM
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This section is for Asic BTC mining. I suggest you move your thread to the ALT mining section.
In the bottom left corner of YOUR post there is an option to move it. You will find some answers
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January 13, 2018, 06:55:02 AM
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.... All looks good. Few freezes and eventually system starts. Card gets recongnized after few mins, done DDU, reinstalled GPU drivers. Problem is then I'm mining even desktop lags a lot and mining performance is like 10 times slower on all cards.
This is weird, if it freezes sometimes, there's really a problem.
But seeing that the your rig starts, this might be a power issue, not your PSU but maybe from the riser, it wasn't powered.
The MoBo's PCI-e slots are powered which is used by the GPU, those 8-pins power connectors are the supplementary power.
You can't use the cards properly with incomplete power source, it could be the riser, it doesn't supply the power from the PCI-e slot.

Quote from: JordanLTU
Could Windows reinstall help? Maybe it has to be installed while that pci-e card connected? I'm out of ideas.
Not at all, you can plug anything without needing to reinstall Windows..
It doesn't look like a software issue to me.

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January 13, 2018, 08:23:11 AM
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.... All looks good. Few freezes and eventually system starts. Card gets recongnized after few mins, done DDU, reinstalled GPU drivers. Problem is then I'm mining even desktop lags a lot and mining performance is like 10 times slower on all cards.
This is weird, if it freezes sometimes, there's really a problem.
But seeing that the your rig starts, this might be a power issue, not your PSU but maybe from the riser, it wasn't powered.
The MoBo's PCI-e slots are powered which is used by the GPU, those 8-pins power connectors are the supplementary power.
You can't use the cards properly with incomplete power source, it could be the riser, it doesn't supply the power from the PCI-e slot.

Quote from: JordanLTU
Could Windows reinstall help? Maybe it has to be installed while that pci-e card connected? I'm out of ideas.
Not at all, you can plug anything without needing to reinstall Windows..
It doesn't look like a software issue to me.

Well it is powered. Because if I don't connect that SATA power cable GPU doesn't even light up. And it hits all the performance not even that GPU. Other 2 gpus are directly to pci-e x16. Also if i put them all to pci-e sockets everything is fine, just the heat issue on middle one, so that's not psu power issue. I still got room left. Using evga g2 850. It takes off the wall only 600w then all gpus in pcie x16 sockets. Maybe someone could recommend some kind of Linux distro (graphical interface, Havnt used it for 5 years so I have forgotten even basic commands, will have to Google it) so I could boot it off usb flash drive and try how mining speed is down there?
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January 13, 2018, 08:31:36 AM
 #5

look up hive os.

its a Linux based very lightweight OS you can run from a USB. I personally have no experience with it but it has been recommended to me before as well.

good luck
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January 13, 2018, 09:06:41 AM
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My first guess would be you have a bad riser.

Are you using an x1 to x16 riser, or an x16 to x16 riser? Either should work, but there happen to be some x16 to x16 ribbon-style riser that are made by more reputable manufacturers.

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JordanLTU
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January 13, 2018, 10:10:27 AM
 #7

My first guess would be you have a bad riser.

Are you using an x1 to x16 riser, or an x16 to x16 riser? Either should work, but there happen to be some x16 to x16 ribbon-style riser that are made by more reputable manufacturers.

I will look into hive OS thx. I'm using x1 to x16. Riser looks made very well nice soldering and so. For some reason my PC doesn't recognize it if I put in to x1 which is light grey color, but it's there if I put it in blue bottom one. If it is riser fault I tend to believe only GPU which is connected through riser would have bad performance, not the. It is which are connected to x16 directly. Really strange. To clarify my MB is Asus p9x79 pro.
VirosaGITS
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January 13, 2018, 10:50:31 AM
 #8

My first guess would be you have a bad riser.

Are you using an x1 to x16 riser, or an x16 to x16 riser? Either should work, but there happen to be some x16 to x16 ribbon-style riser that are made by more reputable manufacturers.

I will look into hive OS thx. I'm using x1 to x16. Riser looks made very well nice soldering and so. For some reason my PC doesn't recognize it if I put in to x1 which is light grey color, but it's there if I put it in blue bottom one. If it is riser fault I tend to believe only GPU which is connected through riser would have bad performance, not the. It is which are connected to x16 directly. Really strange. To clarify my MB is Asus p9x79 pro.

Don't trust risers... i have a box with >100 of them, all bad, over time, i have a constant stream of risers failing. Just imagine them like disposable pieces, because that's what they are..

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JordanLTU
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January 13, 2018, 12:09:43 PM
 #9

Can bad pci-e riser cause  all other cards act strange? I thought if riser is bad card just doesn't work.
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January 13, 2018, 12:19:34 PM
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Can bad pci-e riser cause  all other cards act strange? I thought if riser is bad card just doesn't work.

Bad riser can cause so many things. Instability, crashes, driver issues... So yes it can make things act strange and so many other things.

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JordanLTU
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January 13, 2018, 12:22:37 PM
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Time to order more risers I guess, or should I try Linux first? Or get x16 to x16 riser?
VirosaGITS
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January 13, 2018, 12:24:59 PM
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Time to order more risers I guess, or should I try Linux first? Or get x16 to x16 riser?

I use 100% usb 1x 16x riser using actual pci-e power connector, no sata adapter. Sure you can try linux. I use ethOS, but i'm a bit biased there~

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JordanLTU
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January 13, 2018, 12:45:21 PM
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Time to order more risers I guess, or should I try Linux first? Or get x16 to x16 riser?

I use 100% usb 1x 16x riser using actual pci-e power connector, no sata adapter. Sure you can try linux. I use ethOS, but i'm a bit biased there~

Thanks gonna try to use pci-e power connector instead of SATA.
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