CCminer(SP-MOD) Modded GPU kernels.

[bensam1231]

I have tested some more. Release 74 is using more power and heat, so the card trottle and performance is lost.
My test was conducted in a closed case rig with a EVGA superclocked card (2x 6pins power)

but my dev card:
The gigabyte 970oc G1 comes with 1x8 pin and 1x6 pin and doesn't trottle and give bether performance in release 74 than 66.

SP_, all 5.2 maxwells do at least 1500MHz under load. In open case, limiting factor is TDP. Nothing to do with power pins.

-edit

Testing how far I can go with reference 970. You need to give this baby almost +300 to get there (1500). Around 10500 kH/s mining lyra2v2.

-edit2

Same settings with quark, hitting TDP and only hashing about 17200 kH/s. TDP mod is all you need if you want to get all out of these.

It has to do with power pins: max TDP depends on how the card is powered. I have two kinds of 970 and the max TDP is higher on the one that has one 8 pin and one 6 pins instead of 2x6.
Furthermore, the power you need to reach a certain frequency varies based on a lot of variables like room temperature, efficiency of cooling, fan speed, the chip itself, etc.

Correlation does not imply causation. I have some cards with less pins that draw more power then ones with more pins. It just happens that in this case sometimes you get cards with more pins that draw more power then cards with less pins. Take some low clocked Gigabyte cards (not Windforce) and compare them to Asus Strix cards...

They can program the bios to draw as much power as they want and it's up to the manufacturer to decide how many aux connectors they want on the board.

It's actually scary thinking some people are using 750tis without aux connectors and sucking it all through the board because they think that wont have any adverse effects. I don't think I'd ever do that or buy 750tis without a aux connector.

thefarm in its ( almost ) entirety are the gigabyte 750ti oc lp ( low profile ) which have NO aux power connectors ...
BUT - they draw their power from the powered usb 3.0 risers as well as from the pcie bus ...
so even though they have no aux power connector - they run really well for a 750ti card ...
there was a time when the whole farm was based on gigabyte 280x oc cards which were ALL run off the ribbon risers - 5 x 280x oc cards per machine ... cable risers melted and burned through their power connection pins - and some destroyed cards like they were firecrackers ...
changing to the usb 3.0 powered risers fixed the majority of power issues - but the gigabyte 7970 oc / 280x oc cards ended dying due to their fan malfunctions ... so not a power issue but a manufacturing / heat dissipation issue on that end ...
#crysx

Powered ribbon risers or just ribbon risers? I use power ribbon risers and they don't cause any problems. I also have some USB risers and it doesn't seem to change much.

It's extremely hard to clip the 12v to the board on a USB riser as well and most feed power from the board in addition to their connector.

NVIDIA cards will trottle and downlock if you don't have enough power. (If the power exceeds the TDP)

6 non powered 750 ti's on a single motherboard is not a problem as long as the motherboard is equipped with extra power. Like the h61 and h81 asrock BTC boards. Default tdp of the oldest non powered 750ti cards is 38w (in the bios) This can easily be checked with the NVIDIA inspector tool.

It's not like there is a limitation on the amount of current carried across a wire. There is a limitation where the wire will carry so much current it will start melting, but unless it's built into the card, it's entirely possible to deliver 200w over a 8pin vs 2x6pin. Just because a 8pin is rated for so many watts in spec does not mean it will necessarily be limited to that in practice.

[pallas]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

[AzzAz]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

And I add: all mobos can supply 1 or 2 pcie slots with 75W. Better one maybe 3, and that is why Pro BTC have molex on it: to give 75W to all 6 ( or7) pcie...

also Crysx... if you use both mobo mollex nothing will happen. Mobo already have its 12v enough ...

[joblo]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

I don't have the actual spec but this seems to say otherwise...

https://en.wikipedia.org/wiki/PCI_Express#Power

I wouldn't be concerned with drawing 75W from an x1 slot if the x16's weren't already fully loaded.
200W is the max draw I would put on the PCIe bus unless the MB is specifically designed for higher.

[pallas]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

I don't have the actual spec but this seems to say otherwise...

https://en.wikipedia.org/wiki/PCI_Express#Power

I wouldn't be concerned with drawing 75W from an x1 slot if the x16's weren't already fully loaded.
200W is the max draw I would put on the PCIe bus unless the MB is specifically designed for higher.

I assume you are reading it wrong. It says that the card can request 75W regardless of the type, even though it should be a graphic card; no mentions of the connector type.
Furthermore, the powered pins are all on the 1x part of the connector.

[hammer24p]

does anyone known what this is extranonce.subscribe and how to get rid of it

[joblo]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

I don't have the actual spec but this seems to say otherwise...

https://en.wikipedia.org/wiki/PCI_Express#Power

I wouldn't be concerned with drawing 75W from an x1 slot if the x16's weren't already fully loaded.
200W is the max draw I would put on the PCIe bus unless the MB is specifically designed for higher.

I assume you are reading it wrong. It says that the card can request 75W regardless of the type, even though it should be a graphic card; no mentions of the connector type.
Furthermore, the powered pins are all on the 1x part of the connector.

I don't know why you are bringing up connector types and power pins because it has nothing to do with
what I'm saying. I'm talking about the aggregate power through the PCIe bus of the motherboard.

A quote from you in a previous post:

"The difference is that the BTC MB can provide 75W to ALL the slots together."

I agree entirely. Then I said:

"I wouldn't be concerned with drawing 75W from an x1 slot if the x16's weren't already fully loaded.
200W is the max draw I would put on the PCIe bus unless the MB is specifically designed for higher."

How does that conflict with your statement?

[sp_]

does anyone known what this is extranonce.subscribe and how to get rid of it

You can run ccminer with the -e switch to turn it off.

[sp_]

"The difference is that the BTC MB can provide 75W to ALL the slots together."

But only if the 2 extra 4 pin molex'es are connected to the psu.

[pallas]

"I wouldn't be concerned with drawing 75W from an x1 slot if the x16's weren't already fully loaded.

How does that conflict with your statement?

I think I misread that statement. I thought it meant that a x16 slot can provide more power.
Maybe you meant that you can power up to 2 cards from a standard motherboard? Then yes: I use to say that up to three is safe.

[tbearhere]

does anyone known what this is extranonce.subscribe and how to get rid of it

You can run ccminer with the -e switch to turn it off.

-e I don't know what that is.
sp do you have the latest readme file on ccminer ?
Ps contributions coming soon.  
Got my new rig working again with 2  750ti....2 980ti .

[sp_]

maybe I called it -x don't remember.. Run ccminer --help


the readme hasn't been updated in a while...

ccMiner release 1.5.2-tpruvot (SP_MOD) (april 2015)
---------------------------------------------------------------

***************************************************************
If you find this tool useful and like to support its continued
          development, then consider a donation.

tpruvot@github:
  BTC donation address: 1AJdfCpLWPNoAMDfHF1wD5y8VgKSSTHxPo
  DRK  : XeVrkPrWB7pDbdFLfKhF1Z3xpqhsx6wkH3
  NEOS : NaEcVrdzoCWHUYXb7X8QoafoKS9UV69Yk4
  XST  : S9TqZucWgT6ajZLDBxQnHUtmkotCEHn9z9

sp-hash@github:
  BTC: 1CTiNJyoUmbdMRACtteRWXhGqtSETYd6Vd
  DRK: XdgfWywdxABwMdrGUd2xseb6CYy1UKi9jX
  
DJM34:
  BTC donation address: 1NENYmxwZGHsKFmyjTc5WferTn5VTFb7Ze

KlausT @github:
  BTC 1H2BHSyuwLP9vqt2p3bK9G3mDJsAi7qChw
  DRK XcM9FXrvZS275pGyGmfJmS98tHPZ1rjErM

cbuchner v1.2:
  LTC donation address: LKS1WDKGED647msBQfLBHV3Ls8sveGncnm
  BTC donation address: 16hJF5mceSojnTD3ZTUDqdRhDyPJzoRakM

***************************************************************

[joblo]

"I wouldn't be concerned with drawing 75W from an x1 slot if the x16's weren't already fully loaded.

How does that conflict with your statement?

I think I misread that statement. I thought it meant that a x16 slot can provide more power.
Maybe you meant that you can power up to 2 cards from a standard motherboard? Then yes: I use to say that up to three is safe.

I think I know where we went off the rails. I was describing the intent of the 1x slot in the context of the entire PCIe subsystem
while you were focussed on the maximium power of a 1x slot in isolation. I also assumed that if someone (a miner
specifically) was looking at installing a GPU in a 1x slot they already had GPUs in the x16 slots.

We're all good.

[antantti]

I have tested some more. Release 74 is using more power and heat, so the card trottle and performance is lost.
My test was conducted in a closed case rig with a EVGA superclocked card (2x 6pins power)

but my dev card:
The gigabyte 970oc G1 comes with 1x8 pin and 1x6 pin and doesn't trottle and give bether performance in release 74 than 66.

SP_, all 5.2 maxwells do at least 1500MHz under load. In open case, limiting factor is TDP. Nothing to do with power pins.

-edit

Testing how far I can go with reference 970. You need to give this baby almost +300 to get there (1500). Around 10500 kH/s mining lyra2v2.

-edit2

Same settings with quark, hitting TDP and only hashing about 17200 kH/s. TDP mod is all you need if you want to get all out of these.

Yeah right...

I have 6 maxwells 5.2 + 3x 750ti and only 1 of them is able to do a stable 1500+. All of them are over 1400 but no way to do a stable 1500 without a vcore rise.  
Each of them was slowly overclocked by 20Mhz step. When I have noticed any crash of a miner I put it 20Mhz back. Gigabyte G1 970 was also benchmarked in some Windows "gaming" benchmarks.
Those are the clocks I'm using 24/7 without any stability problem and temperatures from 65-74°C:
gigabyte G1 980 1450Mhz
gigabyte G1 970 1560Mhz
3x Asus strix dc2oc 970 1440/1450/1480 Mhz
960 1411 Mhz
3x 750ti 1400/1420/1440 Mhz

Btw I don't care optimizing H/W ratio, because the electricity price is still low at my location.

With the r.74 I get more or less the same speeds as in r.66.

Yeah I was wrong there when I said all maxwells... Do you have a quality PSU? Custom fan settings? I like to run my rig(s) with overkill PSUs with loads somewhere in 50-60% area if possible. Mining cave temperature is some in 22-24 celsius area.

All 5.0 I have tried have done 1400 easily, all 5.2 cards 1500, with or without power pins, with or without custom cooling. Maybe I have been just lucky...

I also tested one non-reference 970 card with quark. Both cards with one 8-pin connector, overclocking both to 1500 area. Hitting TDP so hard... Non-ref wins hands down 18200 - 17200.

[bensam1231]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

I wouldn't ever pull 75w through the tiny little traces on a motherboard to all the slots at the same time, that's just a recipe for disaster, regardless of having a extra molex connector or two supplying juice.

[antantti]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

I wouldn't ever pull 75w through the tiny little traces on a motherboard to all the slots at the same time, that's just a recipe for disaster, regardless of having a extra molex connector or two supplying juice.

Everyone can easily test it. Do some search with melted ATX-connector, when mining touch the connector somewhere near those two pins.

[AzzAz]

The main benefit of the BTC MBs is the ability to supply 75W to 1x slots which are normallly limited to 15-25W, which makes
the use of unpowered risers possible.

All the motherboards can provide 75W thru the 1x slots, it's by specifications. The rest of the pins do not provide any power.
The difference is that the BTC MB can provide 75W to ALL the slots together.

I wouldn't ever pull 75w through the tiny little traces on a motherboard to all the slots at the same time, that's just a recipe for disaster, regardless of having a extra molex connector or two supplying juice.

As I said, my 2 rigs are runing perfectly, 6x960 and Pro BTC. Even OC'd. Now is 3 months already. And cheap cheap risers.

[pokeytex]

Crazy question - could i run (2) algos on the same rig in (2) separate instances.  For example - (1) instance running X11 and (1) instance running (Skein2) on the same cards?  What are the draw backs if any?  I checked power consumption and there doesn't seem to be a change in power draw.  Just wondering if I can break my rig that way? Thanks - pokeytex

[bathrobehero]

Crazy question - could i run (2) algos on the same rig in (2) separate instances.  For example - (1) instance running X11 and (1) instance running (Skein2) on the same cards?  What are the draw backs if any?  I checked power consumption and there doesn't seem to be a change in power draw.  Just wondering if I can break my rig that way? Thanks - pokeytex

Can't break your rigs that way but likely the driver will crash sooner or later. Or one algo will probably dominate the other so the hashrate won't be equal.

Depending on what you want to achieve you might be better off dedicating a couple of cards to one algo and the rest of them to another.
Or you could just use a batch file which switches between the two algos periodically or as a failover.

[joblo]

Crazy question - could i run (2) algos on the same rig in (2) separate instances.  For example - (1) instance running X11 and (1) instance running (Skein2) on the same cards?  What are the draw backs if any?  I checked power consumption and there doesn't seem to be a change in power draw.  Just wondering if I can break my rig that way? Thanks - pokeytex

Interesting thought. It won't break anything, it's just like running multiple processes on a CPU. But I don't think it
will work well. Most processors perform better with fewer processes with better cache performance and less task
switching overhead. Vector (SIMD) processors like cuda are even more optimized for doing the same thing over and over.

What you are suggesting would be suitable in a hyperthreaded environment where two threads share a common
set of execution resources. As long as the two threads require different execution units they can run simultaneously.
Unfortunately mining algos use almost exclusively integer arithmetic so the combined peformance of the two threads
would be the equivalent of one.

It might be worth an experiment to see what the combined performance is.

You can always run different instances on different cards if you want to mine two algos at the same time.