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staraptor (OP)
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June 21, 2011, 05:04:04 PM
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Anyone else had this?  At around ~880 clock, the cards I have been using are pushing around 350Mhash.  When I bump the clock rate up higher, say 900+, the mhash rate goes down (sometimes by nearly half).
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zargon
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June 21, 2011, 05:04:52 PM
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Quote from: staraptor on June 21, 2011, 05:04:04 PM
Anyone else had this?  At around ~880 clock, the cards I have been using are pushing around 350Mhash.  When I bump the clock rate up higher, say 900+, the mhash rate goes down (sometimes by nearly half).

are they being throttled down due to heat?
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June 21, 2011, 05:49:01 PM
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doubt it - it's simply a matter of when I increase the clocks, the Mhash drops o.O heat was at 74c
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June 21, 2011, 05:59:01 PM
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Perhaps the card is just unstable at that clock. Does Furmark or similar run without artefacts?
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June 21, 2011, 06:04:29 PM
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Which card are you using?

Some cards' firmware throttles the processing to reduce emitted heat, as already mentioned.
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