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March 08, 2018, 08:08:29 PM |
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Welcome to the wonderful world of mining.
The same thing happens to a lot of new miners, they do their research by looking at all the rosy projections of a GPU doing x amount of hashrate and earning y amount of profit per day, then they extrapolate the data out to a year (or two) figuring they can breakeven and make some money, so they go ahead and plunk down $2-$3k on some mining gear.
It is at this point the hard reality sets in that at almost every step of the way the rosy predictions seem to be off. The card everyone else claims gets 150 hashs or 2200 sols turns out to only produce 140 hashs or 2000 sols, worse the pools show even less.
Also, between the time you ran all your calculations and purchased, built, and tweaked your rig the price calculations have gone south and mining difficulty has risen resulting is less coins per day and the price has dropped. The result is your payback period has gone up even further than your originally anticipated.
Getting back to your particular issue, pools estimate your hashrate based upon the number of valid shares your miner submits to them, whereas your local display is simply showing you the guesses per second.
Most of the time the pool will reflect a lower overall hashrate as many inefficiencies creep into the equation. First, your miner may have a run of bad luck, where it sucks at guessing and submits a low number of shares. Your miner may guess correctly, but send the share right as the pool is moving on to new work, thus your otherwise valid share a few milliseconds ago now becomes a stale share so isn't counted by the pool. This can be compounded by a high latency between your miner and the pool and in extreme cases packet drops on your connection can result in lost shares.
On top of all this, the pools themselves are competing against other pools, so they too can have a run of bad luck, so even if you are hashing properly the pool itself may run into a period of reduced profits.
In the end it is not unusual to see a difference between what the pool shows and your miner displays. As has been already poitned out, over a longer time period the running average can even out some of the bumps, but on the whole your pool hashrate will normally be a little under what your local miner is displaying.
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