Re: [ANN] [ASIC-RESISTANT] UltraCoin (UTC) - Newly Launched
I see there are some questions that keep popping up again and again. Might as well pop in to see if I can help in some way.
At what point does it become pointless to use our GPUs?
If the current n-factor gives me 120/150 KH/s for my 280Xs/290, the next will be be 60/75 and then 30/38. I will still be able to mine the same number of coins with these hash rates? Just trying to figure out how long my 4 280Xs and one 290 have got with this coin/scrypt.
If the current n-factor gives me 120/150 KH/s for my 280Xs/290, the next will be be 60/75 and then 30/38. I will still be able to mine the same number of coins with these hash rates? Just trying to figure out how long my 4 280Xs and one 290 have got with this coin/scrypt.
N = 14 07 / 12 / 14 @ 04:20:16am UTC At this N and beyond it will be more cost effective to mine with CPU.
I would like to know why does n-factor not affect cpu's. yeah yeah memory intensive, multiple threads, ram. i got all that, but if hashrate halves for cpu's as well, which I don't know if it halves, then wouldn't cpu mining still get harder over time as n-factors increase?
Can someone who has been cpu-mining AND experienced any n-factor change answer?
Can someone who has been cpu-mining AND experienced any n-factor change answer?
Been wondering this since day 1. Defo needs an answer.
bump
Both CPU and GPU are affected similar, in terms of dropping hash rate each N increase. However, the gap in actual hashrate gets smaller with higher N. As well, CPU's actually "fall-off" slower in hash slightly than gpu / perform better later.
For example 600khs GPU with N increase may be similar to; 600>290>130>60>25>10>5.
Comparing this to a CPU over same N increases; 125> 65> 35> 20> 10>5>2.5
Part of this reason was described best and quoted here;
"CPU's still have a number of advantages over GPU's and ASIC's. They come with double precision floating point hardware, employ very advanced branch prediction mechanisms, incorporate at least 2MB of on chip L2/L3 cache, and are able to speculate through 4-6 branches even in ten year old machines. GPU's can manage 2-5x better double precision floating point performance than a typical CPU, but in some benchmarks, they cannot even manage even speed. The problem is worse for ASIC's, which must be custom designed around a specialized pipeline. "
Again quoting another location; here is a representation of hash rate on a CPU vs increasing N values.
Running 1500 scrypt hashes with N=2048 - 0.00109417 avg. sec per hash
Running 1500 scrypt hashes with N=4096 - 0.00216536 avg. sec per hash
Running 1500 scrypt hashes with N=8192 - 0.00450547 avg. sec per hash
Running 1500 scrypt hashes with N=16384 - 0.00928228 avg. sec per hash
Running 1500 scrypt hashes with N=32768 - 0.01895874 avg. sec per hash
Running 1500 scrypt hashes with N=65536 - 0.04028997 avg. sec per hash
Running 1500 scrypt hashes with N=131072 - 0.08082690 avg. sec per hash
test written in python on an i5-4250U CPU @ 1.30GHz,
In the end it's not that CPU's hash way faster than GPU's at high N's; specifically, it's that CPU's cost less Watts per Kh/s to mine at higher N's.
Some examples of hash rates and setups with CPU's and GPUs @ N = 14; can be seen here - http://yacoinwiki.tk/index.php/Mining_Hardware_Comparison
You can see, as an example here @ N14
2x E5645 Procesors 2x 80W -- 1.53Kh/s
7950 GPU (250w) 1.3-1.5 Kh/s
As shown above. the Processors will give approximately the same Kh/s for 160w versus 250w of a 7950.
Bumface, is ziggy doing anything at all about the CPU mining problem?
what problem?
There's no CPU miner for UTC... And the question have been asked many, many times.
U can't advertise a coin for being GPU and CPU friendly after a while and not have a CPU miner
There are a few CPU miners. One is listed on the Ultracoin forum too. However, there is one specific miner that is best and most up to date.
-Manual N parameters for multiple coins
-X86 and 64bit formats
-Stratum pool capable
-Scrypt optimizations for Scrypt-Jane
https://github.com/thirtybird/cpuminer/releases/
This is the absolute best CPU miner out there currently. I believe it has all the needs being asked for.
Even though I'm not actively posting here; I still hate to not help if I can.
Thanks
Prot
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