Scrypt.cc Profit Analysis

What is Scrypt.cc ? In the same way that you can rent SHA256-based ASIC mining power at cex.io, you can rent scrypt-based computers at a per-Kh/s rate. This site mines various Altcoins and exchanges them for BTC for you. You can then withdraw that BTC at any time.

This is just a preliminary analysis of the potential income on Scrypt.cc so far. I've been renting hash power there for about a month now, and it looks fairly good.

It is a fairly new website, and it is under development. They plan to add more control to the users, for example to choose which types of coins to mine.

When I joined, the stock price was B0.00144, but when sold out, prices rose to the B0.00155 range.
The income varies a lot. You get mining rewards every 10 minutes, like this:

Mining rewards are paid every 10 minutes. For me, at my speed, it varies between 0.0000100 and 0.0000300.

This is just the raw data logged for 5 days

The BTC income on that list can vary up to 200%, so I spent a week logging the estimated income from the Scrypt.cc dashboard. 

The 'Conclusion so far' column shows my own monthly estimate, while the average Scrypt.cc estimate is under the 'Scryot.cc Profits Average' column. As you can see, we differ by just B0.001.

The reason I am interested in renting is because summer is coming, and I cannot justify keeping 1000 watts running just for mining. That is only worth it during winter. Want to sign up at Scrypt.cc ? Just click that banner. It's a referral banner that will get me a little extra bonus. And so will you if you pass on you own referral link. The site is a bit unclear as to where the bonus comes from; some people thought it came from the referee's own money but the devs themselves clarifed this in a chat with me. The bonus comes from the pool itself ! So don't worry!

Trying to rent out my Antminers!

bitcoinminingmarket is a leasing site where you can rent out your mining gear, like betarigs and leaserigs.

Here is my humble rig for rent:: Mining speed 4GH/s 24h rental on stable EU server

The site is snappy and responsive and is easy to use. I've had no luck so far, but I've had the account for under 24 hours.

CGminer for scrypt mining tutorial

First off, the original CGminer for GPU is dead. All 3.8 and newer builds are made for ASICs only. Luckily, it has been forked, and scrypt-mining on GPU has been kept. Get kalroth's CGminer fork at http://k-dev.net/cgminer/. Also have a look at this thread at overclock.net.

Configuring CGminer is quite complicated (it is JSON formatted), but my basic one goes like:

{
"pools" : [
{
"quota" : "20;stratum+tcp://server1:3333",
"user" : "x.x",
"pass" : "x"
},
{
"quota" : "50;stratum+tcp://server2:3333",
"user" : "x.x",
"pass" : "x"
},
{
"url" : "stratum+tcp://server3:3333,
"user" : "x.x",
"pass" : "x"
},
{
"quota" : "10;stratum+tcp://server4:3333",
"user" : "x.x",
"pass" : "x"
},
{
"quota" : "20;stratum+tcp://server5:3333",
"user" : "x.x",
"pass" : "x"
}
],
"failover-only" : true,
"load-balance" : true,
"scrypt" : true,
"kernel" : "scrypt",
"intensity" : "15,13",
"thread-concurrency" : "4476,3198",
"gpu-threads" : "1",
"gpu-platform" : "1"
}

This config turns on the normal scrypt module, as you can see.

Also it enables failover and load balancing. As you can see, server 1,2,4,5 shares their quota amd server 3 is only a fail-over, but it will still failover to any alive pool as long as a server with quote demand is dead.

20+50+10+20 = 100 %.

Notice the "quota" parameter replacing the usual "url" parameter, and that is add a comma separator after the quota specified before the url!

Intensity: Is just how much steam the cards can handle. If you see in the CGminer console that you are getting HW errors, lower the intensity. 15 is a bit high, but I get no errors. 13 is more common, but still gives me a HW error of 1 per day or so. That is not good, so I should lower intensity to 12 and see how it goes.

Note the comma-separation on the parameters that supports it. Generally PCIe slot 0 is the first, PCIe slot 2 is the second, etc!

Thread concurrency: Is calculated by taking number of GPU shaders and multiplying by 4 (for the 6xxx and 7xxx series, other models has other optimal calculations.) and remove 4.

GPU Platform: Normally, the platform available on PCIe slot 0 becomes gpu-platform 0. That means if you have an Nvidia card in slot 0 like me, and 2 AMD cards on slot 1 and 2, it becomes platform 1. So platform 1, card 0 and 1 is my active cards in CG miner. cudaminer would then need the opposite config, pretty much.

Starting up CGminer from a batch file:

@echo on
ECHO "cgminer miner startup"
ECHO.
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --config=cgminer.conf

setx works on Windows, as some people dispute. Look at the 'succeeded' return-message in the console.