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Why doesn't the hashrate on my pool stats match with my miner?

My miner is reporting 604MH with 462 frequency. But the pool is reporting 570MH?

If overclocking to 462M without undervolting is already generating HW errors, does that mean I will have to OVERCLOCK my miner?

Very hard to answer. Are you tossing thousands of errors hundreds of errors or dozens of errors.

In day 100 errors is no big deal

Mine indeed is tossing 1100 HW in 2 hours.

I'm now seeing a clearer picture of it. The % error is indicated at the HW row under the Nounce# column right?

The value for my first rig is 0.4% despite getting 7k HW errors in 14 hours.

The value for my second rig is 0.01% with just 200 HW errors.

What about the percentage of DiffA# column?

It's also very dependent on how the pool parcels out work, how much work is thrown away, difficulty settings etc

I'm getting 1% error rate, difficulty at 65k, pool reported rate average for the past 24h between 550 to 600; miner reports effective rate of 595 (due to errors ~1%) at 462M frequency

Did you undervolt or overvolt it? What does 1% error rate mean? My HW errors are numbers like 5k in 10 hours, still reporting 599MH average on stats panel. Pool panel (litecoinpool) reports 540-660 so huge fluctuation here. Feeling like mine needs an overvolt.

1% errors means that 1% of overall hash is in error - basically, miner reports 604 as what the chips are hashing, 595 as average, and hardware errors under nonce reports 1% errors.
Fluctuation is normal, over time miner is "600 MH/sec" but difficulty and shares are based on luck - in the long run I should be getting around 600 MH - 1% = 594 at pool.
This is further reduced by work from pool not being "instant" and the antminer software itself has discarded work.

% error is indicated under Nonce# column HW row right?

For the first machine, I get 7k hw errors in 15 hours, 0.4056%
Second machine 4k hw errors, 0.2532%
The third machine I got 158 hw errors, with the number just being 0.0101%

These percentages do seem like hw error % due to their relevance proportionally.
As long as I keep these numbers reasonable, I'm undervolting correctly?

Yes I shoot for under

0.0500%