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Title: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: glendall on June 09, 2013, 09:38:28 PM Subject title pretty much says it. Can anyone give me a ball park number on how much power is used by mining system with 3 7950's?
I'm trying to run some cost estimates on my power. I'm using a Gold rated psu, have a hard drive, low wattage core i5. Anywhere in the ball park is good. I'm thinking somewhere around 900w to 1 Kw . Does that seem about correct? Thank you. (No Kill-o-watt guy here). Title: Re: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: Mazakguy on June 09, 2013, 09:40:49 PM I have 2 of thoses with semptoron's and run about 800 watt each rig
Title: Re: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: bcpokey on June 09, 2013, 09:41:43 PM From the wall? Depends on your OCs, but I'd say closer to 850W.
I ran a 2x7970 and 1x7950 system @ 800W, pulling 1.8GH/sec. Title: Re: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: glendall on June 09, 2013, 09:56:22 PM Ok thanks a lot guys. Guess I was pretty close then. So around 850W . I'll now go answer 2 questions in the noob forum to pay you guys back...
Title: Re: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: derr777 on June 09, 2013, 10:57:10 PM it just depends on your clocking.
I run with low power costs, so I run my 7950s over 320w and over 640Mh/s each, and would tell you more like 1025watts at that level. So, you have a nice range to work with there, depending on how much you want to overclock and what your electricity costs. Title: Re: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: Hephaestus on June 09, 2013, 11:31:39 PM I've got three 7950s right now on a 1000 watt power supply (80+ Gold certified) and it's pulling about 930 watts at the wall, 620 kH/s per card. I haven't tried to tweak it to save power yet, though.
Title: Re: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: Choadmeyer on June 09, 2013, 11:34:40 PM it just depends on your clocking. I run with low power costs, so I run my 7950s over 320w and over 640Mh/s each, and would tell you more like 1025watts at that level. So, you have a nice range to work with there, depending on how much you want to overclock and what your electricity costs. +1 I'm running 3 - 7950s (~625Mh/s ea) on a 1250w 80+ Gold Seasonic PSU and my wattage is hovering around 1050. Kind of makes me nervous about adding another card but I know those 3 are very overclocked (around 1150 & 1600) and could be pulled back in the event of another GPU. Title: Re: Rough estimate of power usage for mining rig w/3 x 7950 ? Post by: zackclark70 on June 09, 2013, 11:44:55 PM i have 3 cards runing at 701w from the wall 1911kh/s 1050/1250 1.050v core reaper
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