Why X11 runs cooler - an answer.

[Wolf0]

NaN.

[Ice Man]

This makes more sense than most of the guesses out there. Thanks for for sharing this answer with us. 

[Radelderth]

wolf, I don't get what you are trying to say. Can you put in layman terms please?

[AltCoinTroll]

wolf, I don't get what you are trying to say. Can you put in layman terms please?

X11 runs cold because the implementation sucks and a good part of the GPU is idle.

But that is actually nice on the hardware. Less wear and tear.

[sniveling]

wolf, I don't get what you are trying to say. Can you put in layman terms please?

X11 runs cold because the implementation sucks and a good part of the GPU is idle.

The dark coin wiki says this about it.

Is X11 cooler in GPUs because it's inefficient?

Not necessarily. Bitcoin mining in GPUs (SHA256) requires less energy than Scrypt and yet no-one claims that SHA256 implementation is inefficient – it's just that there are differences in how each hashing algorithm uses the hardware.

Regarding X11, apparently the “gaps” in the chaining sequence, as one algorithm is hashed with the next algorithm, provide for a “breathing” space or “lag”. An alternative explanation is that certain algorithms (out of the 11) are just slow when processed by a GPU and thus slow down the whole process. The hashing of a chain can only go as fast as the slowest algorithm of the chain.

There should be some level of optimization possible in some of the hashing algorithms that increase the hashrate and energy consumption in future versions of the GPU miners. Groestl in particular is considered to be improvable.

http://wiki.darkcoin.eu/wiki/FAQ#Is_X11_cooler_in_GPUs_because_it.27s_inefficient.3F

[Spoetnik]

wolf, I don't get what you are trying to say. Can you put in layman terms please?

X11 runs cold because the implementation sucks and a good part of the GPU is idle.

no shit i said that when it came out and they ran around advertising that and you all argued with me endlessly LOL

I told you so

PS:
Put Blocknet in your topic title if you want people to read this

The world is tuned in and we need up to the minute late breaking Blocknet-gate scandal coverage !

PPS:
I can post 50 quotes of me saying that 6 months ago too if need be
thanks for proving my rightness though..
I am always right, come to terms with it  

[UnicornFarts]

wolf, I don't get what you are trying to say. Can you put in layman terms please?

X11 runs cold because the implementation sucks and a good part of the GPU is idle.

no shit i said that when it came out and they ran around advertising that and you all argued with me endlessly LOL

I told you so

PS:
Put Blocknet in your topic title if you want people to read this

The world is tuned in and we need up to the minute late breaking Blocknet-gate scandal coverage !

PPS:
I can post 50 quotes of me saying that 6 months ago too if need be
thanks for proving my rightness though..
I am always right, come to terms with it  

Additionally, x13 and x15 suck for the same reason. The x14 and x17 PoW functions, too, but nobody cares about them.

What about the X7 that Cryptonite uses?

[Spoetnik]

well i was impressed by your work though good job

and X7 i have no idea LOL

JHA aka: Jackpotcoin uses mix of 5 .an X5 algo of sorts
and it is less of heat draw than X11 too

[UnicornFarts]

any opinions on lyra2 that vertcoin is supposed to be coming out with?  they claim it will be easier on the cards than scrypt ... wonder if it has this compromise

P.S.  I'm picking up some jackpotcoin just 'cuz i love you spotniek

[UnicornFarts]

any opinions on lyra2 that vertcoin is supposed to be coming out with?  they claim it will be easier on the cards than scrypt ... wonder if it has this compromise

Ehehehe. I'm gonna have fun with Lyra2RE. The current code for Lyra2 - even without the extra hashes - is quite bad. Once it works, I'll have a field day.

In other words - your closed sourced miner will be much more efficient than the open source one huh

[UnicornFarts]

any opinions on lyra2 that vertcoin is supposed to be coming out with?  they claim it will be easier on the cards than scrypt ... wonder if it has this compromise

Ehehehe. I'm gonna have fun with Lyra2RE. The current code for Lyra2 - even without the extra hashes - is quite bad. Once it works, I'll have a field day.

In other words - your closed sourced miner will be much more efficient than the open source one huh

By a mile, likely. By the way, technically, my miner is open source - those who it is shared with have the source - I'm just picky about who I share it with.

Nothing wrong with that.  Just out of curiosity why do you normally sell your miner or mine yourself instead of releasing a closed source with a %?

[BitJohn]

Great write up and discussion great stuff.

[Come-In-Behind]

Nice write up OP. Btw Spoetnik, you're wrong most of the time.

I am always rightwrong, come to terms with it  

[Hityor_Petar]

Is it the same for FRESH algo?

[Hityor_Petar]

Is it the same for FRESH algo?

No idea, I'd have to look at it.

Oh ok. It runs cooler and acts a lot like x-11.

[Ignition75]

wolf, I don't get what you are trying to say. Can you put in layman terms please?

X11 runs cold because the implementation sucks and a good part of the GPU is idle.

Hehe I've read in many forums x11 runs cooler cause it sucks at hashing.  I'm surprised nobody has bothered to fix this until now...

Or perhaps it was such a large job to do properly it required some long term planning.

Do me a favour mate, "basically the same - the extra wave in flight helps hide memory access times, causing it to be faster", can you explain why the extra wave in flight helps hide memory access times?  Why is hiding memory access times a good thing for speed?

[Ignition75]

wolf, I don't get what you are trying to say. Can you put in layman terms please?

X11 runs cold because the implementation sucks and a good part of the GPU is idle.

Hehe I've read in many forums x11 runs cooler cause it sucks at hashing.  I'm surprised nobody has bothered to fix this until now...

Or perhaps it was such a large job to do properly it required some long term planning.

Do me a favour mate, "basically the same - the extra wave in flight helps hide memory access times, causing it to be faster", can you explain why the extra wave in flight helps hide memory access times?  Why is hiding memory access times a good thing for speed?

Because the GPU schedules other waves to execute while the memory access is going on. So you basically lose no hashing time. If you have less waves in flight, you can end up stalling on a memory access.

OK so why is this so? Because the GPU schedules other waves to execute while the memory access is going on.

Why would it bother scheduling waves if it can operate more efficiently doing things a different way?

[1echo]

decent guide !

[abora]

Are you saying X11 is better than other coin protocol?

[Hityor_Petar]

decent guide !

Agreed. Enjoying it so far.