Sorry in advance if this a repost, I tried searching but to no avail. I currently have the boost enabled on the card and it does hit 950mhz but it constantly cycles between 850mhz and 950mhz no matter what game I play. Is this normal or could it be a power related issue or something to do with settings?
The card is currently hooked up to a 750w ps with one 6+2 power cable and a 6 pin to 2x 6+2 pin converter, could this be causing issues.
Any tips or comments are greatly appreciated.
More about :sapphire hd7950 vapor boost cycle 850mhz 950mhz constantly
It draws enormous amount of power and it should be locked at around 950 MHz when under loads. Cycling between 850 and 950 seems to be odd.
Also to run it you need "at least" 850W PSU. That is minimum so having anything around 1000W - 1200W should be okay.
My Sapphire dual-x does the same thing. If you want, get an overclock tool and set it to 951mhz and it will stay there all the time if you are that worried.
What it does is uses the 850mhz on parts where it isn't as demanding and doesn't need the boost, but when it gets more demanding, it uses the boost technology to help it out with the demanding parts.
I upped the clock speed to 951mhz using triXX and it still cycles between 850 and 951. It seems to cycle between the clock speeds regardless of the load, it stays at 950 for no more than a second or so. Should I turn the boost feature off and manually turn it up to 950mhz?
It is just turning itself down when it doesn't need it. It actually saves power. It isn't a bad feature. It is no different than say an i5-3570k. It runs at 3.4hgz but when it needs the extra boost it boosts up to 3.8ghz. Same thing with your card.
Your card might even lower voltage when it doesnt need higher voltage. Mine does that too.
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