Hello,

I'm new here and can't seem to find the answer to this, so I wanted to ask out right.

I have two machines with GPUs that are chugging along making some progress in the pooled mining over at bitcoin.cz.  I have two other machines that do NOT have GPUs and I just got cgminer installed on them since it can do CPU-only mining.  The problem is that I've been running them for days, and each day I check the stats.  Typically, they look like this:

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$ ./cgminer -a 4way -o http://api2.bitcoin.cz:8332 -u USERNAME -p PASSWORD

Summary of runtime statistics:

Started at [2011-08-11 11:08:37]
Runtime: 13 hrs : 31 mins : 20 secs
Average hashrate: 13.0 Megahash/s
Queued work requests: 3516
Share submissions: 173
Accepted shares: 0
Rejected shares: 173
Reject ratio: 100.0
Hardware errors: 0
Efficiency (accepted / queued): 0%
Utility (accepted shares / min): 0.00/min

Discarded work due to new blocks: 3261
Stale submissions discarded due to new blocks: 1
Unable to get work from server occasions: 0
Work items generated locally: 5591
Submitting work remotely delay occasions: 0
New blocks detected on network: 95

Summary of per device statistics:

 CPU 0: [3.0 / 3.2 Mh/s] [Q:830  A:0  R:34  HW:0  E:0%  U:0.00/m]
 CPU 1: [3.0 / 3.3 Mh/s] [Q:786  A:0  R:39  HW:0  E:0%  U:0.00/m]
 CPU 2: [2.8 / 3.3 Mh/s] [Q:936  A:0  R:47  HW:0  E:0%  U:0.00/m]
 CPU 3: [3.0 / 3.3 Mh/s] [Q:826  A:0  R:53  HW:0  E:0%  U:0.00/m]
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I realize the computation rate is very slow compared to a GPU, but I'm wondering if something is wrong with the setup.  One of my GPU machines has an old GPU (ATI RV710) that computes at only ~8 MHash, so compared to that, this 13 MHash rate shouldn't be totally worthless.  Except everything is rejected by both of my CPU miners 100% of the time, and even the slow GPU miner is getting acceptable rates (e.g. ~2500 accepted, ~20 stale/invalid).

Any information here is appreciated, thanks!