Bitcoin Forum

Hello all! I am wondering if still exists a crpto currency to mine solo with my CPU i5 and get any profit of it? Lets say i dont pay for electricity , because i use my laptop at work and let it work for the night at 100%? ::) Thank you

Any coin is profitable as long as you dont pay for electricity and you dont buy a computer just for mining.
Try Primecoin or something..

Well, you also have to factor in the CPU parts cause it would spoil in no time :)

Since you don't have 100 plus cpu cores to mine Primecoin (XPM) with, best if you use a mining pool. Ypool is the only currently working.

Anyone else say +1 if primecoin is best for mining with CPU? 10x

Conventional "mining" is a bit intense for a laptop, something like http://www.devtome.com/doku.php?id=cpu_mining would probably be much better.

-MarkM-

I heard that GPU primecoin miner has the same speed as CPU primecoin miner. But you cannot mine primecoins in a pool, because algorithm is constructed that way. So you mine very long, and either find lots of blocks or nothing.

I mined primecoin about 2 days ago with 12 cores,  i7 3770k & i5 2500k only managed 0.5 coin in 24 hours, that was on ypool. You might have better luck. Oh and I didn't find any blocks in that time either.

don't use primecoin pools, they can be cheated, due to the algorithm.

Plenty
at least 80
just look at the announced coins
but most arent profitable to mine

Care to elaborate  ???

So you say that mining with CPU is useless anymore?

it is looking for chains of prime numbers. If you connect to the pool and mine with lower difficulty, you can submit shares that are valid for lower difficulty (like - there is a chain of six prime numbers), but you know - because during calculations you cannot skip this check - that this share will never meet the target difficulty (for example ten prime numbers in the chain). So essentially this share is fake: meets lower difficulty, but cannot ever meet higher difficulty. And after you submit the share the pool has no way of verifying that, unless it spends longer time to calculate your share. That would be pool spending CPU mining itself, only to verify your shares.

In bitcoin it is different: there is always a fair chance that a submitted share will meet the higher difficulty and solve a block. In primecoin you already know it won't ever meet it, and you can adjust your algorithm to send even more lower difficulty shares, where each of them will not have a chance at all to meet higher difficulty.

So pool mining isn't efficient because it can be cheated.

Thanks for the explanation ;)

OK and about the topic again:   Is there a alternative crypto currency to mine solo with a CPU which can be profitable? 10x ::)

you can try either primecoin or litecoin.

I am mining litecoin on my spare CPUs, it is about 6x more profitable than bitcoin. See table on top-right on https://coinotron.com

EDIT: also check http://dustcoin.com/mining   but profitability is scaled to separately for scrypt and sha256 algorithms.

This is so dumb. Primecoin is like 100x more profitable then litecoin if you mine using CPU. Even if you mine primecoin on a pool and even if pool has plenty of cheaters. Try it, man.

I can estimate how many primes per second I can get from my cores, but I cannot find any primecoin difficulty calculator. Care to give a link? Then I could compare with XPM price on btc-e and verify your claims.

EDIT: I have found this one: http://anty.info/primecoin-calculator/ but I don't know how to get from PPS to chains per day :)

EDIT2: well if these two are telling truth:
   http://anty.info/primecoin-calculator/    
   http://www.ppcointalk.org/index.php?topic=638.0

then primecoin is between 2x and 4x times more profitable than litecoin. Considering that litecoin is currently at its bottom and will easily double its price in next months, then I prefer litecoin than primecoin. I'm too lazy to configure yet another miner :)

Getting 100x more profitable is in your dreams :)