Mining at 1100mhash at btcguild pool, only getting about half what I should?

[baggytheo]

Hey guys,

I just started mining this week with two rigs, one dual 6950 and one dual 5850. I'm using GUIminer with poclbm on Windows 7 64bit, with the latest catalyst drivers. My mhash readouts on both GUIminer and the BTCguild stats page total at over 1100mhash/s, which according to the simple bitcoin mining calculator (http://www.alloscomp.com/bitcoin/calculator.php) should be yeilding 0.71 coins per day. But my 24-hour rewards count on BTCguild for the past 3 days bas only been 0.35 coins per day.

Help 

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[carbonc]

They had a couple of bad blocks. I believe he fixed the problem though.

You should also have a backup pool incase BTCGuild goes down.
I know they had some outtages last week as well too.

[JoelKatz]

To find out whose fault it is, look at how many shares you're generating. If you're generating too few shares, it could be your fault. If you're generating the right number of shares, it's the pool's fault (or bad luck).

[baggytheo]

How do I know how many shares are enough?

[shane_kerr]

It doesn't really cost anything to sign up for another pool. Why not go ahead and try deepbit for example, just to compare?

[Bert]

0.71 coins per day

There are two words missing "on average". Some days you will make more some you will make less. The whole thing about mining is that it is not fully predictable. If you want predictable exact income everyday, join a pay per share (PPS) pool, your income will be slightly less, but it will be totally predictable. The pool owner takes the risks and they charge you for taking all the risk.

If you were solo mining the following statistics would apply at the current difficulty of 1,564,057
http://www.alloscomp.com/bitcoin/old_calculator.php

Probability   Time
---------- -----------------------------
Average      70 days, 16 hours, 22 minutes
50%            48 days, 23 hours, 50 minutes
95%          211 days, 17 hours, 54 minutes

Every 71 days on average you would make 50BTC+fee (assuming that difficulty did not increase)
[50/70.666666666 is 0.70754717 BTC or rounded to two decimal places 0.71 BTC per day on average]
After 49 days you would have a 50% chance of solving a block and earning 50BTC+fee (assuming that difficulty did not increase)
After 212 days you would have a 95% chance of solving a block and earning 50BTC+fee (assuming that difficulty did not increase)

If you honestly really are worried that some pool is cheating you then log the output of your clients to file, and compare accepted shares with what the website says that you have submitted.  On most pools, your income in Bitcoins should be 50*(your_shares/total_shares) for each solved  block. Almost all pools have this information on their Stats/Blocks/History pages.

EDIT: My 100th post