Topic: Will this setup work for my first mining rig? (Diagram included) (Read 808 times)

i can confirm that the gpus dont work with only 6 pins (even though the 1660tis get a large majority of their power from the risers).  I didn't purposely test this out.  I just didnt fully plug in the last two pins on one gpu and was wondering why it wasn't being recognized.

Anyways I no longer have any issue with plugging in my gpus properly since I contacted evga about providing extra 8+6 pin cables so im all good now. 

Here is my current issue (which I posted in my most recent reply): ive had my rig up for a month (pretty stable for the past 2 weeks). So I have devoted my time to tweaking the OC settings so that I can extract a little more juice out of the cards. I had a few questions about my process and results.

For the past couple weeks I have been mining zcoin (mtp) on the trex miner. I have been overclocking with nvidia inspector.

I started by undervolting the cards to .8V and +150 core clock. (Well I bumped the core clock up by +25 until +175 caused imediate crashes).

I kept it at +150 and the rig ran for 15 hours straight without any gpus crashing. Then one gpu crashed. So I changed that gpu to +140 and the rest to +150. I ran the rig and now another gpu crashed after only 3 hours of uptime. Strange because that gpu was fine during the 15 hours uptime previously. Anyways, I lowered the clock on that one.

And I have been doing that process on repeat for about a week and a half. The rig will run fine for half a day but then I will check on it and see that a gpu had crashed. Ive had uptimes of 24+ hours and uptimes as low as 15 minutes. The good thing about trex miner is that it restarts itself (https://imgur.com/a/qcknxQW) and the affected gpu is running like normal, its not "crashed", as in it is not working anymore. Trex keeps a running list of all the gpus that crashed during the current session so that helps me from having to scroll up to find any errors(https://imgur.com/a/WHORZA7).

My questions: Am I doing this overclocking thing correctly?

I keep lowering and lowering the core clocks, seemingly without end. For my 9 gpu rig my core clocks are: +110,+110,+130,+150,+100,+100,+70,+100,+100. And still the rig will have a gpu that crashes once a day. And the weirdest thing is that one gpu will be running fine at its current clock for days and then it crashes for some reason. When will it end??

Why is it that one gpu ran fine for 24 hours at +130 but then couldn't run more than 2 hours at +120? Is the issue my core clocks or something else?

The gpus never "crash" so hard that they freeze the pc or even cause the gpus to be non responsive. Trex miner restarts its processes and all the gpus are operating like normal after restart, sometime for many hours afterwards. Other miner apps Ive used freeze or cause the pc to freeze when a gpu OC error occurs so thats neat. So should I even lower the core clocks or leave them high since the downtime is only for a few seconds? Is there any long term damage to the cards from the crashes?

Could this be a trex issue?

Since the 1660Ti's are generally low power GPUs, you can try and plug in a 6 PCIe into the 8 PCIe connection on the GPU and it will most likely still work. Most of my RX 470/570 have 8 PCIe connectors but plugging in a 6 PCIe still works on them.

You can verify this with a multi-meter and see if all the GND pins are continuous and not one of them is a sensor pin. You couldn't do this with older GPUs back in the 2013 days such as the R9 280X because they had a sensor pin and made sure an actual 8 PCIe was connected but they were power hogs at > 300 Watt per GPU.

I think the reason they do this is because many people have a hard-coded 8 PCIe connector with their PSU which doesn't separate and they wanted those PSUs to get used.

ive had my rig up for a month (pretty stable for the past 2 weeks). So I have devoted my time to tweaking the OC settings so that I can extract a little more juice out of the cards. I had a few questions about my process and results.

For the past couple weeks I have been mining zcoin (mtp) on the trex miner. I have been overclocking with nvidia inspector.

I started by undervolting the cards to .8V and +150 core clock. (Well I bumped the core clock up by +25 until +175 caused imediate crashes).

I kept it at +150 and the rig ran for 15 hours straight without any gpus crashing. Then one gpu crashed. So I changed that gpu to +140 and the rest to +150. I ran the rig and now another gpu crashed after only 3 hours of uptime. Strange because that gpu was fine during the 15 hours uptime previously. Anyways, I lowered the clock on that one.

And I have been doing that process on repeat for about a week and a half. The rig will run fine for half a day but then I will check on it and see that a gpu had crashed. Ive had uptimes of 24+ hours and uptimes as low as 15 minutes. The good thing about trex miner is that it restarts itself (https://imgur.com/a/qcknxQW) and the affected gpu is running like normal, its not "crashed", as in it is not working anymore. Trex keeps a running list of all the gpus that crashed during the current session so that helps me from having to scroll up to find any errors(https://imgur.com/a/WHORZA7).

My questions: Am I doing this overclocking thing correctly?

I keep lowering and lowering the core clocks, seemingly without end. For my 9 gpu rig my core clocks are: +110,+110,+130,+150,+100,+100,+70,+100,+100. And still the rig will have a gpu that crashes once a day. And the weirdest thing is that one gpu will be running fine at its current clock for days and then it crashes for some reason. When will it end??

Why is it that one gpu ran fine for 24 hours at +130 but then couldn't run more than 2 hours at +120? Is the issue my core clocks or something else?

The gpus never "crash" so hard that they freeze the pc or even cause the gpus to be non responsive. Trex miner restarts its processes and all the gpus are operating like normal after restart, sometime for many hours afterwards. Other miner apps Ive used freeze or cause the pc to freeze when a gpu OC error occurs so thats neat. So should I even lower the core clocks or leave them high since the downtime is only for a few seconds? Is there any long term damage to the cards from the crashes?

Could this be a trex issue?

ttps://i.imgur.com/54l3eFY.jpg bad idea linking between PSU's. Riser and GPU's PCE power needs to come from the same PSU. don't mix

Instead of plugging 2 PSUs into 2 seperate plugs, I always recommend purchasing a nice Surge Protector that can do a 12A 120V constant load. That way its easier to start up the system instead of worrying about 2 different on buttons. Just flip the on button on the surge protector and you are good. That 1300W PSU will power more than 5 GPUs no issue. You would actually be able to power all your GPUs with that no issue. Purchase an 8 Pin to dual 8 Pin to be able to power 2 GPUs from 1 single PCIe slot on the PSU. Sata Cables are perfectly fine. Since you are using a 1660ti they pull very little from the slot and pull very little from the cables, so you will have no issue with the sata connector. You will also be perfectly fine chaining 2 Risers per Sata connector on the PSU.

Its really questionable if people on here actually built out larger farms that are saying to not do these things. People dont really have understanding and use like 2 threads as evidence that sata connectors are bad and all. Just look Der8auer pulled over 200W from a PCIe slot, that would throw all these people crazy.

I run many 8x1080tis at 65-70% TDP with 2 EVGA 850W G3 PSUs. 2 Risers per sata connector on the PSU, 8pin to dual 8 pin on the 4 pcie connectors from the PSU. Ran them for years not one single issue.

Nothing in particular, that adapter is designed to switch-on the two/three PSUs simultaneously by connecting all the PSON (green, if colored) wires to a neutral wire of the PSUs as you press the power-on switch connected to the Mobo.
(your image: the adapter's two wires)

Those will blow if you stare at them too much, JK.
Just don't short anything.

https://imgur.com/a/5wH9a6Q

so im going to try to connect my second psu to my rig so i can add more gpus.  my mobo (gigabyte b250 fintech) came with this mobo adapater.  Is there anything I need to do in order to stay safe and not blow anything up?  I read that I need to power on the non mobo connected psu first and then power on the main psu.  and that i have to turn them off in the opposite order.   or do i not have to do that sort of behavior if i am using the adapter?  When I shut down the computer can I keep both psus in their switched "on" state or do i have to cut the power off?

so it turns out that one of my gigabyte 1660tis runs at 140w at 100% tdp.  wtf?? how is that possible?  i thought all 1660tis run at 120w.  do i have a fake 1660ti? lol. all my asus 1660tis are fine, 120w at 100%

I think that's just myths. As long as your cooling is OK (fans can sometimes die on GPUs, never had the issue, but it can happen) your cards will not have any longevity issues. Most of my gear is comprised of RX470s that are past 2 years old now, they still run like a charm.

The same goes for when I was selling some of my gear, people would always ask "Has it been used for mining???".

They assumed that because you use a GPU for what it is essentially intended for (do calculations. I mean when you game, it's the same thing....) the GPU would be worn out and on its way out. Which is about the most retarded question you can ask.

The fact is most miners will actually turn things down a notch with voltages and usually tune the card's frequency in by often underclocking it in regards to the undervolt. What matters isn't having the highest hashrate, it's having a stable GPU that doesn't give you high numbers of stale or bad shares and that you can leave running for days on end without a problem.

So the conclusion is that if there was any scientific evidence on if overclocking had any effect on a GPUs longevity, you could make the point that a miner's card would be in better shape than that of a gamer who would usually try to overclock the card to get the max performance out of it.

Regarding temps, GPUs can handle 70°C and up no problem.

Also look on the pool side of things. How does your reported hashrate match your miner's hashrate. Any large discrepancy means you likely went too far with your over/under clock/volt.

the temps are fine, only 54C for each of those cards.  or is there a memory controller temp as well?

He definitely mean risers (Sata to 4/6-pin adapter).

∙ Sata power cables are the same as the 4-pin molex or the GPU cables except for the connector.
∙ Some PSUs have the same output for the all 12v rail; and some low-quality ones have a dedicated rail for the GPU cables, low power for other peripherals; so the "rated for low power consumption" isn't an issue for your 80+ bronze rated PSU.

Yes, not adviceable because the pins are too thin and small so it has a lot of resistance that can produce a lot of heat if the current is too strong,
result: the connector (not the wires) will burn; but it's rare.

---

The "throttling" GPU must be reaching high temperature and those that crash aren't stable.
"Silicon Lottery".

so i got around to min maxing my overclock settings today and i noticed that on 3 gpus that they put out 31.2 mh/s at +895 mem clock but at +900 they each drop to 28.7 mhs. Is this some sort of a throttling? i find it strange that they would drop so much at a hard limit while my 3 other gpus all crash before the +895 mark.

i dont really understand your anecdote.  your colleague used sata cables to connect to gpus or risers?  arent sata cables inadviseable because they rated for a low power consumption? im not trying to use sata connections at all.  just vga pcie 6+2/6 pin cables to power on my gpus (the 6+2 pin for my gpu and the 6 pin for the riser of the gpu above it).

That depends on the cards you are using,a colleague of mine used to connect two Gpu-s within the same Sata cable which can only support one Gpu and the result was that a Thermaltake PSU blowed away,we were using two of them for a six Gpu rig.Better stick to the plan it works best,do not overload your cabling and you should be fine.

Not really, every card is different due to the 'silicon lottery' for the GPU and memory used on the card plus other factors like the algo being mined, temperature (room as well as heat generated buy the card(s) / PC), there is also the card variation as well, this being the make / model, eg - EVGA make 3 - 5 models of a card as does MSI and others, all with different clock specs / parts used to make that card model.

At the end of the day, it's 'trial and error' for the cards that you have.

thats the site i used to most when i was building my rig.  but it doesnt cover any of the overclocking aspects.  is there any site that addresses proper overclocking methods?

For the OP and others here ....  please visit the site below, best site for those that are new to mining with GPU's.

https://www.gpuminingresources.com/p/what-hardware-do-i-buy-to-start-mining.html

good to stay around 75% or less. thats most efficient in my experience. keep temps 60s or below if you can. I keep my fans below 70% also.

finding the best settings is trial and error. each brand/model/card is different. have to play around with them and find the best for you and for each card. each card can do different things as not all silicon is the same. some are better than others

so ive been ming for a couple days. i have my power limit set to 80% but i noticed on the graphs(https://imgur.com/a/f5DVVfw) that there are some spikes over the limit, up to 100-120% at the peaks of the circled spikes.  is this a reading error or something that absolutely shouldnt be occurring?

Another question I have:  I have read that running GPUs at 100% power ruins the longevity of the cards.  Does overclocking the core and memory clocks have the same effect?

Last question: I've seen conflicting information.  Does running at 100% power ruin cards or does running at high temps (i.e. 70+) ruin cards.   ive been running at 60% power and have been only hitting 39-51C.  is it safe to up the power?  the thing im struggling with is finding overclock settings.  what ive been doing is upping the core by 25 and the mem by 150 and seeing if its stable.  but i feel like ive already overclocked it further than i should.  how do i know when its too much? right now im sitting at 60% power, +150 core, +700 mem mining mtp (zcoin)

the issue is my psut doesnt have any VGA cables with two 8 pin connectors on them so I cant string two gpus on one vga cable (since my 1660tis all use 8 pin connections). 

tbh, while doing my homework for my rig I think I read that its better to not use any extensions, splitters, or converters for the PSU cabling since the more connections the higher chance for an issue, aka fire, etc.  So thats why I would rather not add a extension for the 6 pin connector on my cables just so that I can keep both the riser and the gpu on that riser on the same VGA cable. 

If its advisebale I could power a gpu with a 8pin and then use the 6 pin on that same cable to power the riser of the gpu hanging above that one.  And then I could use a 8 pin cable to power the gpu that is handing above the first gpu.  They would all be on the same psu.