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Title: New rig (2x 5870) crossfire question/problem Post by: kstepyra on May 05, 2011, 10:43:37 PM Hi,
It's my first topic in here, so don't yell at me if i post it in wrong place:) I am going to buy new computer for pc games, but i am also going to use it as rig. It's going to be 2x 5870 GPU's. The question is - if i have windows 7 professional 32bit (can change it to 64 if needed) i will be able to run miners on both gpus? or i will have to change anything/install software or something? Also i heard about turning out crossfire. How does it affect mining / games? or it's impossible to mine on crossfire? A nice explanation on topic will be nice as i've seen on wiki that there are 5870 x 2 statistics. Best regards, Jakub Title: Re: New rig (2x 5870) crossfire question/problem Post by: c-rock on May 05, 2011, 11:32:54 PM I am running a Win7pro 64bit with two 5870s.
I had no probs running miners on both gpus. You have to have two miners running. Change the Device to =1 and =2 for each miner bat file. I did not crossfire them. It does not matter for the 5870s. You can have them crossfired, or not. Same performance either way. Make sure you upgrade your PSU. I would recommend a 900Watt or higher PSU. c-rock Title: Re: New rig (2x 5870) crossfire question/problem Post by: kstepyra on May 06, 2011, 12:46:03 AM Nice, ill give it a try in couple days. Btw - you are mining with normal GUIMiner? And what's yours mhash/s ? :) i heard it can go up to 400 and over it with little OC and specific card parameters
Title: Re: New rig (2x 5870) crossfire question/problem Post by: c-rock on May 06, 2011, 05:40:39 AM Using poclbm and was getting 358 on my first card,
and 370s on the second. I could push them more, but they would crash. You need to just work it up to a level that is borderline crazy. :P Title: Re: New rig (2x 5870) crossfire question/problem Post by: Meni Rosenfeld on May 06, 2011, 06:40:33 AM Make sure you upgrade your PSU. I would recommend a 900Watt or higher PSU. You don't need a 900W PSU. You need a high-quality PSU such as Seasonic X-series, 750W tops but 650W should do fine too. Anything which is not from a known brand is utter junk, and even within a brand some products are good and others not so much.Title: Re: New rig (2x 5870) crossfire question/problem Post by: benjamindees on May 06, 2011, 07:35:00 AM It's amazing to me how awful the PSU market has become. I had good luck with Antecs for several years, but I have one here (SP-450) that crapped out, because apparently it had defective capacitors. "Japanese capacitors" is now a feature that is used as a selling point. Wattage ratings are completely useless. Oh well, I'll try my luck with Corsair.
Title: Re: New rig (2x 5870) crossfire question/problem Post by: c-rock on May 06, 2011, 01:43:02 PM Make sure you upgrade your PSU. I would recommend a 900Watt or higher PSU. You don't need a 900W PSU. You need a high-quality PSU such as Seasonic X-series, 750W tops but 650W should do fine too. Anything which is not from a known brand is utter junk, and even within a brand some products are good and others not so much.you might be able to go with a smaller one, but your efficency will be lower, plus overclocking does use the juice more. I still stand by my recommendation. A bigger PSU will have better effiencies. Title: Re: New rig (2x 5870) crossfire question/problem Post by: Meni Rosenfeld on May 07, 2011, 08:19:11 PM Make sure you upgrade your PSU. I would recommend a 900Watt or higher PSU. You don't need a 900W PSU. You need a high-quality PSU such as Seasonic X-series, 750W tops but 650W should do fine too. Anything which is not from a known brand is utter junk, and even within a brand some products are good and others not so much.you might be able to go with a smaller one, but your efficency will be lower, plus overclocking does use the juice more. I still stand by my recommendation. A bigger PSU will have better effiencies. |