<p>An Antminer U3 is a SHA256 miner, it can not mine anything else. The shares are being rejected because they are effectively nonsense to the receiving pool, as they do not satisfy the difficulty requirements they have asked for.</p>

CC BY-SA 3.0
2015-08-24T02:27:27.790Z
2015-08-25T06:55:00.897Z
2015-08-25T06:55:00.897Z
Claris
<p>hope someone can help.
I use an Antminer U3 on a Raspberry Pi with Minera and CGminer.</p>

<p>When I mine everything with Scrypt-Algo, I get 100% rejected shares.
My current pool is ghash.io.</p>

<p>My log looks like:</p>

<p><code>Rejected 09ffd3f1 Diff 26/16 AU3 0 pool 1 (Low difficulty share)</code></p>

<p>my config file:</p>

<pre><code>{
    "api-listen": true,
    "api-allow": "W:127.0.0.1",
    "log-file": "\/var\/log\/minera\/cgminer.log",
    "scrypt": true,
    "scan": "all",
    "pools": [
        {
            "url": "stratum+tcp://multi.ghash.io:3333",
            "user": "WORKER",
            "pass": "123"
        }
    ]
}
</code></pre>

<p>My additional options are: --au3-volt 780  --au3-freq 238</p>

<p>Minera shows a hashrate of about 60 GH/s, Ghash.io shows about 1MH/s in the multipool.</p>

<p>When i change to the bitcoin pool, everything works fine.</p>

<p>Any ideas?
Could it be affected by the pool difficulty, i can set on the ghash.io panel? </p>

<p>Thanks in advance</p>

CC BY-SA 3.0
2015-08-24T02:20:11.027Z
Isn't the Antminer U3 an SHA256 ASIC miner? How are you expecting it to mine using scrypt?
Nate Eldredge
CC BY-SA 3.0
2015-08-25T05:18:45.610Z
Yep. The Antminer is a Bitcoin miner.
David Schwartz
<antminer>
Always rejected shares (Antminer U3 / Minera /CGminer)
Chris85
# Always rejected shares (Antminer U3 / Minera /CGminer)

(Asked by: username_0 on 2015-08-23)

hope someone can help.
I use an Antminer U3 on a Raspberry Pi with Minera and CGminer.

When I mine everything with Scrypt-Algo, I get 100% rejected shares.
My current pool is ghash.io.

My log looks like:

`Rejected 09ffd3f1 Diff 26/16 AU3 0 pool 1 (Low difficulty share)`

my config file:

```
{
    "api-listen": true,
    "api-allow": "W:127.0.0.1",
    "log-file": "\/var\/log\/minera\/cgminer.log",
    "scrypt": true,
    "scan": "all",
    "pools": [
        {
            "url": "stratum+tcp://multi.ghash.io:3333",
            "user": "WORKER",
            "pass": "123"
        }
    ]
}

```

My additional options are: --au3-volt 780 --au3-freq 238

Minera shows a hashrate of about 60 GH/s, Ghash.io shows about 1MH/s in the multipool.

When i change to the bitcoin pool, everything works fine.

Any ideas?
Could it be affected by the pool difficulty, i can set on the ghash.io panel?

Thanks in advance

**Tags:** antminer

> **Comments:**
> **username_1**: Isn't the Antminer U3 an SHA256 ASIC miner? How are you expecting it to mine using scrypt?  
> **username_2**: Yep. The Antminer is a Bitcoin miner.  

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## 1 answers

### Answer by username_3 on 2015-08-24. Score: 4

An Antminer U3 is a SHA256 miner, it can not mine anything else. The shares are being rejected because they are effectively nonsense to the receiving pool, as they do not satisfy the difficulty requirements they have asked for.


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