Cryptocoin Mining?

[Kosmic1]

Kosmic1, I have a similar issue with my rig that has a 7970 and 7950.

My 7950 gets 660-670 on its own, but when I start up the 7970 then the hashrate of my 7950 goes down to 630 even though I am not using the 7950 for anything (display is plugged into 7970).

Would be nice to find a solution...

Maybe it's a windows thing. One thing I want to try is setting up a bootable linux USB and running the same .bat files to see if hash rates improve. Just haven't gotten around to that yet.

 

[note235]

how are you guys undervolting the 270s?

 

[nwo]

how are you guys undervolting the 270s?

I was using cgminer to overvolt mine. I haven't tried undervolting it though.

Some cards such as my XFX Core 1GB 7850 are weird and will not let you undervolt, only overvolt... :\

 

[Attic]

how are you guys undervolting the 270s?

I started with this guide

That gives a good how to on modifying and flashing the BIOS from a bootable USB.

 

[Attic]

Hey Attic, I had really good luck with my HiS 270 (cheapest/slowest stock clock model). I was able to get it up to 450 stable, max was around 470 but it seems like it lacked power to stay stable at that hashrate since the clocks were extremely high.

It also ran extremely cool when OCed and overvolted, especially considering it was the top card in my PC case....

I'd recommend you give Gigabyte a shot if the price is right. They use two 6 pin power connectors on their cards which should translate into higher overclocks.

Thanks for the heads up. I've looked at both but so far been writing everything off but MSI and Asus. Gigabyte i'm hesitant on due to the requirement of dual 6 pins as it makes the wire job a bit more of a hassle for a 4 or 5 by GPU setup on the 750-850w PSU's. HIS i'll look for at Tiger and Newegg, I keep hearing good things about them. Still a lot of it comes down to luck of the draw with where these things will run and at what volts.

I'm starting to hear horror stories about the fans across the entire TF4 heatsink from MSI, which is by far the most common type of card in my miners.... I have had the bearing grease issue that sprays out across the fan shroud and the grinding noise from the fan, but no fan failures, i'm keeping the fans at below 1500rpm though now. I had the two different MSI cards blow the grease out when run at duration in excess of 2200-2300rpm.

 

[geokilla]

Anyone know how I can undervolt my 7950? I need a VDCC of 1.100 instead of 1.09 and 1.125. 1.125 pushes my core temperatures to 94C while 1.09 is not gaming stable at my overclocked speeds.

 

[Mark R]

7950s can be undervolted with VBE7 and ATIWinFlash. Extract the BIOS, edit the voltage table with VBE7, and flash the customised BIOS onto the card.

This is relatively low risk, as the reference 7950 has dual BIOS. There's a switch on the card, so if you hose one, you just flip the switch and run on the reserve. Budget cards and some non-reference cards don't have the switch - however, I've just done 6 XFX single BIOS 7950 cards, and had no trouble.

Anyway, i've repaired my mine after shorting out a couple of motherboards, because I didn't know how to use riser cables. I've also replaced a burned out card, which didn't like being sandwitched.

Only problem I have now is that I couldn't get a replacement 7950, so I had to get a 280x replacement, and the cgminer settings for these two are not compatible, so one type of card has to run sub-optimally.

Anyway, here are some pics:
Before risers
With Risers

 

[Attic]

7950s can be undervolted with VBE7 and ATIWinFlash. Extract the BIOS, edit the voltage table with VBE7, and flash the customised BIOS onto the card.

This is relatively low risk, as the reference 7950 has dual BIOS. There's a switch on the card, so if you hose one, you just flip the switch and run on the reserve. Budget cards and some non-reference cards don't have the switch - however, I've just done 6 XFX single BIOS 7950 cards, and had no trouble.

Anyway, i've repaired my mine after shorting out a couple of motherboards, because I didn't know how to use riser cables. I've also replaced a burned out card, which didn't like being sandwitched.

Only problem I have now is that I couldn't get a replacement 7950, so I had to get a 280x replacement, and the cgminer settings for these two are not compatible, so one type of card has to run sub-optimally.

Anyway, here are some pics:
Before risers
With Risers

I'm sure the cards, and your ears, are much happier with the risers

You can run two instances of cgminer relatively easily within windows and i'd imagine linux. Some specialty miner OS's like BAMT make it more difficult.

For cgminer you can use the -d argument to select which cards are used by that instance of cgminer. --remove-disabled will remove the non selected cards.

So as an example for a 4x7950 and 1x280x on win7 or 8 you could have one cgminer run with a .bat including
-d 0,1,2,3 --remove-disabled along with your optimal settings for those cards

and another
-d 4 --remove-disabled

if you run a .bat with
cgminer -n
timeout /t 30
you'll get an idea of what card is listed as what number

So with the two istances going for the right card/s you can get optimal settings for everyone.

 

[SunnyD]

New pool available:

http://cash.poolminewith.us

Running CASHcoin. Links to relevant info about the coin are on the news feed on the pool page.

 

[Mark R]

I get "warning. Checkpoint too old" on the CASH wallet. Do you know if it still works with this warning?

Also the pool appears down.

 

[geokilla]

7950s can be undervolted with VBE7 and ATIWinFlash. Extract the BIOS, edit the voltage table with VBE7, and flash the customised BIOS onto the card.

That's what I'm doing and using, but there's no voltage selection between 1090 and 1125. 1090 seems to be too low, and 1125 is too high, causing my temperatures to hit 90C. I need an in between, but VBE7 doesn't offer it.

 

[Mark R]

That's what I'm doing and using, but there's no voltage selection between 1090 and 1125. 1090 seems to be too low, and 1125 is too high, causing my temperatures to hit 90C. I need an in between, but VBE7 doesn't offer it.

That's a limitation of the VRM used on your particular cards.

Some VRMs are fully programmable, some only have fixed settings. My XFX card had fixed settings in VBE7, but my MSI cards were fully configurable in VBE7.

 

[SunnyD]

I get "warning. Checkpoint too old" on the CASH wallet. Do you know if it still works with this warning?

Also the pool appears down.

You can safely ignore the warning. There's supposedly a wallet update coming in the next day or two to fix that.

Pool is up and running from my end. I am hashing on it as well. Are you able to get to the pool website or are you talking about the stratum?

 

[Mark R]

I can't get to the stratum. The website is fine.

 

[SunnyD]

I can't get to the stratum. The website is fine.

My bad. I missed a port on the firewall. Give her a try now.

 

[wand3r3r]

Anyone know how I can undervolt my 7950? I need a VDCC of 1.100 instead of 1.09 and 1.125. 1.125 pushes my core temperatures to 94C while 1.09 is not gaming stable at my overclocked speeds.

Presumably you are talking about a voltage locked one?

Anyway, i've repaired my mine after shorting out a couple of motherboards, because I didn't know how to use riser cables. I've also replaced a burned out card, which didn't like being sandwitched.

Could you elaborate on what went wrong with the risers?

I'm sure the cards, and your ears, are much happier with the risers

You can run two instances of cgminer relatively easily within windows and i'd imagine linux. Some specialty miner OS's like BAMT make it more difficult.

For cgminer you can use the -d argument to select which cards are used by that instance of cgminer. --remove-disabled will remove the non selected cards.

So as an example for a 4x7950 and 1x280x on win7 or 8 you could have one cgminer run with a .bat including
-d 0,1,2,3 --remove-disabled along with your optimal settings for those cards

and another
-d 4 --remove-disabled

if you run a .bat with
cgminer -n
timeout /t 30
you'll get an idea of what card is listed as what number

So with the two istances going for the right card/s you can get optimal settings for everyone.

Thanks, I want to try that, especially so I can put partial hashing towards a new coin and partially on an existing one for example.

 

[IEC]

Seems like profitability as measured by BTC per day from DOGE and all other altcoins is quite a bit lower lately.

 

[f1sherman]

Seems like profitability as measured by BTC per day from DOGE and all other altcoins is quite a bit lower lately.

DOGE is all it matters.
Similarly like BTC keeps roof over DOGE, other alt-coins follow DOGE trending.
Sad days for shibe

 

[Mark R]

My bad. I missed a port on the firewall. Give her a try now.

Working now.

You should make a TOPcoin pool. Demand for mining this has gone nuts, and the prototype pool has turned out to be a scam!

https://cryptocointalk.com/topic/4175-topcoin-top-information/

 

[Mark R]

Could you elaborate on what went wrong with the risers?

I was using powered risers. I powered the Mobo from PSU1, and powered the riser and card from PSU2.

Because the card is getting power only from PSU2 it is effectively totally isolated electrically from the mobo, except by whatever is linking the two PSUs grounds. When the PSUs start up, they take big current surges, as do the caps on the graphics card and mobo. Unless you have extreme ground bonding between the two PSUs, the grounds on the two PSUs can pull apart, resulting in overvoltage to the PCI-e signals.

Options to avoid this are:
1. Power the risers from the same PSU as mobo. The card's ground plane will then act as a tie between the two PSU grounds, keeping them tightly linked together.
2. Add multiple tie wires between ground on the 2 PSUs.

 

[geokilla]

ASICs ARE HERE!

https://bitcointalk.org/index.php?topic=438177.0

 

[IEC]

ASICs ARE HERE!

https://bitcointalk.org/index.php?topic=438177.0

$85 for 70 kH/s. Not a game changer (yet) if you have cheap power.

 

[IEC]

Some quick math:

$300 R280X @ MSRP (before pricing went crazy): 700 kH/s @ ~225W
$850 for 10x dual miner USB: 700 kH/s @ ~25W

Note: both numbers exclude PC power (but both need a PC to run them).

At a delta of 0.2 kWh at 10c per kWh you have a raw power savings of < $15/month. Since I'm paying even less in power, I'll keep my GPUs.

 

[JDG1980]

ASICs ARE HERE!

https://bitcointalk.org/index.php?topic=438177.0

Doesn't look like a serious threat to GPU mining at this time. Only 70 KH/sec for $85? It would take ten of these to equal a R9 280X, and even at today's inflated prices, the AMD card would be about half the cost. Yes, the ASICs use less power, but that's a rather long-term proposition; at current rates, the video cards would pay for themselves much quicker.

 

[rockyct]

I thought I'd check in here. I just got started with cypto currency. I've known about bitcoin for years like most of you guys but never felt like it would amount to anything, so yeah, big fail. I'm only getting involved now because the Dogecoin community really doesn't take themselves very seriously so it's a fun group to be in even if it does collapse at some point in time.

I have no idea how to use cgminer on my own so I'm using GUIMiner with my AMD 7770 and I'm getting about 175 kH. I didn't think it was that good of a graphics card but apparently it's decent for the price.