Mining problems - Mhash rate varies with 40%, why?

[JackH]

I currently have 3 x 1024MB XFX ATI HD6950 800M DDR5 PCI-E  in a computer that is mining through Deepbit.

However I should output more than 1000mhash yet, on avarage I output 600-700mhash and sometimes it goes to 900mhash.

My fluctuations are about 40% and I have no clue to why this is happening. Shouldn it stay steady on 1000+? It cant be that I swing between 550 and 900 all the time I press F5 on deepbit.net to refresh to see mhash rate.

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[buzdowan]

Me deepbit counter also varies from -30% to +20% roughly est. Not every share is the same and pools calculates your speed from number of shares submitted. More relevant is info from your miner.

[trilby]

On sites like deepbit and other site the hash rate is an estimate based on submitted shares.

True hash rates are normally displayed by your mineing software well i know poclbm and cgminer show true hash rates.

[P4man]

What miner application are you using? 600 MH seems very very low for that config. A big short term variance is normal though, its just luck.
Perhaps you should give bitminter a try, see my signature. Its a one click miner, and the pool currently gives you extra bitcoins rather than taking a significant %. Its also one of the fastest miner apps.

[buzdowan]

Try to increase time in minutes for Averaging window for hashrate display (5-60 minutes): option in DeepBit settings, I've tried with 20 minutes and its very accurate (Like team stats which is calculated every 20 min).

Hope this helps