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JoelC707
Premium Member
join:2002-07-09
Lanett, AL

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Re: [Coin Mining] Need input on a Litecoin mining rig

That would put it at 4.25 - 4.5 KH/watt for the 290 or 3.82 - 4.3 KH/watt for the 280x above. Still not as efficient per card as the 750 Ti but given the enormous hashrate difference, I think the 290 takes the cake in terms of "per slot" efficiency.

ilkkis
@htv.fi

ilkkis to Krisnatharok

Anon

to Krisnatharok
said by ilkkis :

- I undervolt them to 0,943 volts - they consume 150-170 watts and hash 650 khash. Forget those Nvidia Maxwell thingys.
said by Krisnatharok:

That's not bad at all. And the hash-per-PCIe-slot is good enough you can scale it up to meaningful income (assuming five cards per rig, that's 3.25 MH/s). ...

Actually I use 4x rigs (2.6 mhs) , because a single 850w, or actually even a good 750w does the job. This saves me the trouble of using some tricky wiring or add2PSU combos, or buying super expensive +1000w PSU's. It's less hassle and more trouble free...if only there ever was such a thing Bad PCI-e risers, and cheapo motherboards are the biggest headache at the moment. Still waiting for more of the quality USB pci-e risers from China

Duramax08
To The Moon
Premium Member
join:2008-08-03
San Antonio, TX

Duramax08

Premium Member

I bought these the other day, and they work great. They shipped from california and were really cheap. They also arrived at the house in 4 days.

»www.ebay.com/itm/1813476 ··· 97.l2649

ilkkis
@htv.fi

ilkkis

Anon

said by Duramax08:

I bought these the other day, and they work great. They shipped from california and were really cheap. They also arrived at the house in 4 days.

»www.ebay.com/itm/181347663780?ss···97.l2649

Yes. I recognize the design, I have one of those! I can confirm that these work well.. I have ordered more of those exact same ones from China... I live in Finland, and unfortunately that store doesn't ship to Finland. The prize is right too.

Cheese
Premium Member
join:2003-10-26
Naples, FL

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Click for full size
All the sudden, I am now having graphical issues on my home pc with a 270 and a 270x :/ Absolutely nothing had changed prior this issue, doesn't happen when the miner isn't running but only when it is.
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

JoelC707

Premium Member

I hate to say it but that is usually an indication that the card has some kind of issue. You may want to use something like MSI Afterburner (with Kombuster) to stress test the cards. Are either of them overclocked?

Krisnatharok
PC Builder, Gamer
Premium Member
join:2009-02-11
Earth Orbit

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Try rebooting? I've had my 290X flake out on me and I have to strip all settings out of the config file and start over until I find a (new) stable TC and clock/mem speeds.

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese to JoelC707

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They were, but even when not, it happens. I did notice, per HWMONITOR, that my 12v dips from 11.9 to 11.7 when the miner starts. I have a new PSU to test tonight.
Cheese

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Rebooted many times, even had BB swap out the 270X, it seems fine if the 270 itself is running but when that 270X kicks in, all hell breaks loose. I am going to swap PSU tonight to see if that may be a cause.
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

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What size PSU (make/model preferable)? That drop isn't too bad under load. If it were that low with no load I'd be worried, and I'd be worried if the PSU weren't say 700+ but it depends on the specs.

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese

Premium Member

It's a Corsair GS600

Have an ultra 750 to test with

Krisnatharok
PC Builder, Gamer
Premium Member
join:2009-02-11
Earth Orbit

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Try different instances of CGminer, one for each card.
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

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Newegg's power supply calculator hasn't been updated with the new R-series GPUs. The 270/270x have a TDP of 150/180 respectively so I went with the closest match I could. I picked 2x 7870's (175W TDP) and just threw in other specs (single 3.5" HDD, pair of 4GB DDR3, and i5 or A8 CPU). Their recommended wattage was about 650-660. I'd say your 600W model is a bit underpowered.

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese

Premium Member

It was working good up until a few days ago, maybe it just pushed it to the limit, I am going to try that other PSU tonight

Krisnatharok
PC Builder, Gamer
Premium Member
join:2009-02-11
Earth Orbit

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said by JoelC707:

Newegg's power supply calculator hasn't been updated with the new R-series GPUs. The 270/270x have a TDP of 150/180 respectively so I went with the closest match I could. I picked 2x 7870's (175W TDP) and just threw in other specs (single 3.5" HDD, pair of 4GB DDR3, and i5 or A8 CPU). Their recommended wattage was about 650-660. I'd say your 600W model is a bit underpowered.

That's not going to be a problem. 600w is more than enough.
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

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Trying different cgminer instances is a quick and easy test so I'd try that first. I've uncovered a problem with your Ultra 750 though. There seem to be a couple of different versions of it so I picked one that was still being sold (TigerDirect, Ultra is one of their brands I believe).

The Ultra PSU has a single 45A 12V rail. The Corsair GS600 has a single 48A 12V rail. That extra wattage is in the 5V and 3.3V rails which are important sure but not where you need to focus on. In fact the Ultra 750 is a slight downgrade. Unless your 5V or 3.3V rails were showing a voltage drop too, I wouldn't bother trying it.
JoelC707

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said by Krisnatharok:

That's not going to be a problem. 600w is more than enough.

I wondered about that. 150 + 180 + 100 = 430W (100W is general CPU/motherboard wattage). That should be enough but he is experiencing some kind of issue and given the voltage drop on the 12V rail under load I'm leaning towards a PSU issue (it's not a drastic drop I admit but still).

Cheese
Premium Member
join:2003-10-26
Naples, FL

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So, I just tested with GUIMINER, with the primary card running, no issues, soon as the second card, which is the 270X starts, the issue starts. I swapped out the cards in the slots originally, but once the 270X kicks in no matter the slot, it happens. Which is why I thought it was the card originally, and took it back to Best Buy last night and swapped it. Which is why I thought PSU.
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

JoelC707

Premium Member

Honestly I agree with Kris, that 600W should be enough given my quick calculation but this tells me you either have a faulty 270x (again) or a PSU problem. Or maybe something up with the motherboard but you swapped slots around so that shouldn't be it.

Try it with just the 270x only. Start with the 270 still installed but deactivated. If it still gives issues, remove the 270 and try again. If either of those work, try starting up the 270 (start it second).

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese

Premium Member

And that's the thing, it was running no problems up until sometime last week, absolutely nothing changed. Well, no, I did swap out my SSD with a bigger one, but other than that, nothing changed.
Cheese

Cheese to JoelC707

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to JoelC707
This Ultra PSU shows 56A on the 12V rail

»www.tigerdirect.com/appl ··· =1583410
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

JoelC707

Premium Member

Not this one: »www.tigerdirect.com/appl ··· =3276567

As I said there were several that fit "Ultra 750" so I had to guess. If the one you linked is the one you have try it. If it's the one I linked I don't think it's worth the effort. What's the specific model number of it?

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese

Premium Member

said by JoelC707:

What's the specific model number of it?

U12-41562 - That's the one I linked
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

JoelC707

Premium Member

Ahh OK. Then in that case, give it a try. It can't hurt since you already have it and all it will cost is your time.

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese

Premium Member

Yep
Cheese

Cheese

Premium Member

Ok, so, same with the new PSU. Each card, by itself, same issue. I disable the first one in the miner, no issues. Sounds like the slot itself may be shot.

Lovely, thank you Asus!
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

JoelC707

Premium Member

OK so it's like this:
Slot 1 - 270
Slot 2 - 270x
Start 270, no issues; start 270x and you get issues?

Then you swap:
Slot 1 - 270x
Slot 2 - 270
Start 270, no issues; start 270x and you get issues?

Did you always start the 270 first and 270x second or did you try swapping that start sequence?

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese

Premium Member

I took and put each card by itself, once the miner starts, the issue happens. The 270X was the original card, then the 270 added after. The 270X was bought on 2/28 and the 270 was bought on 3/10 and put in a few days later. It was working with no issues until about 4-5 days ago.
JoelC707
Premium Member
join:2002-07-09
Lanett, AL

JoelC707

Premium Member

Each card independently has this issue now, not just limited to the 270x? Yeah I'm leaning towards motherboard issue or maybe some strange overclock that has gotten applied and you don't know it.

Cheese
Premium Member
join:2003-10-26
Naples, FL

Cheese

Premium Member

Each card exhibits the same issue separately, I think the motherboard at this point.