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Title: I'm after a 4Mh/s hashrate using 4 or 5 GPU but which are best (and cheapest)? Post by: Ste on December 25, 2013, 01:26:08 AM I've done plenty of reading up around the forum but was hoping people would be able to help with specing my rig.
I'm in the UK if that makes a difference to what hardware is available. Firstly, the simple stuff that's already decided. I've got a 1500w Enermax PSU that I plan on using and I've got a sata3 hdd that I'll use. I'll get an AMD Sempron 145 CPU for the rig and 4gb of ram. Then there's the decision about what cards to use. 4 x R9 290 is an option but 5 R9 280x would be about the same price if not cheaper. Am I right in saying the R9 280x cards would be the best bet? And any advice on which specific model to go for, these are the cards I'm choosing between (http://www.overclockers.co.uk/search_results.php?keywords=R9+280x&rows=0)? I've seen a few people mention the VTX3D R9 280x which I think is this card and the price could mean it's a very good option and I'd be able to get 6 of them (http://www.amazon.co.uk/VTX3D-280X-Graphics-Express-Display/dp/B00FUR83Y8). Motherboards, I've found a few choices... ASRock 970 Extreme3 R2.0 AMD 970 for £69, Asus M5A97 EVO R2.0 AMD 970 for £80, or Asus M5A97 LE R2.0 AMD 970 for £60. They could all take 6 cards, however many cards I was using I'd be using powered risers. Anyone got knowledge about which of these would be best suited to mining in a multi card rig? And of course if there are any other motherboards I should consider then I'd be grateful for any suggestions. Would 5 x R9 280x be okay running from my Enermax Platimax 1500w (http://www.scan.co.uk/products/1500w-enermax-platimax-epm1500egt-full-modular-80-plus-platinum-95-eff-eps-12v-1-x-139mm-fan-atx-v23)? I think that's all the questions I've got for now. Thanks for the help. :) Stephen Title: Re: I'm after a 4Mh/s hashrate using 4 or 5 GPU but which are best (and cheapest)? Post by: yorich on December 25, 2013, 01:45:49 AM radeon r9 290x's supposedly do around 900 kh/s each, so 4 of those would work, but probably run you around 1300 watts. I've got 3 280x's doing over 2100 Kh/s @ ~940 watts, waiting on a second PSU and my aluminum frame chassis to come in to add 3 more.
I tried venturing out onto 290x's but they didn't perform so well mixed with my 280x's in win 7, perhaps they'll do better on a linux platform Title: Re: I'm after a 4Mh/s hashrate using 4 or 5 GPU but which are best (and cheapest)? Post by: Ste on December 25, 2013, 01:48:57 AM R9 290x are pricey :(
So 6 x VTX3D AMD Radeon R9 280X would be over 4200Kh/s using under 2k of power and would require a second PSU. Many options. |