Any point to running a 7870 @ 390 Mhash/s? : BitcoinMining

[Build Help] Dedicated Rig with 4x 7970 or 4x 7950 for Bitcoin Mining. [x-post from /r/bitcoin]

Hey Guys,
I built my first rig using the advise you guys gave me - a GTX680 gaming rig. It is however extremely inefficient for mining Bitcoins and other cryptocurrencies.
I wish to build a great ATI rig and put together two different set ups which essentially come down to a 4x7950 vs 4x7970. (it's almost impossible to get a 6990 let alone 4 of em).
Here are the tentative builds here. (I used pcpartpicker)
4x7970: [2] http://pcpartpicker.com/usedracodraconis/saved/1snT 4x7950: [3] http://pcpartpicker.com/usedracodraconis/saved/1sqM
Note that while the 7950 setup would have a lower hash rate, it also uses about 200W less power overall. I suppose, this may have a net benefit on electricity savings in the long run.
I am willing to spend a good amount of cash in pursuing this but want to be prudent about it as well. Would there be any way to optimize either build even further? I.e. cost savings/performance boost etc?
Also, is there a need for a riser card with my specific mobo? Will there be any notable difference in performance with/without it? If so, is there a particular brand I should get?
For reference values on bitcoin hash rates, see here: [4] https://en.bitcoin.it/wiki/Mining_hardware_comparison
It might seem like a pity to hook this up to a monitor and game on it, so I might do that at some stage :)
Here is the thread on /Bitcoin
Also, do you guys know of any video tutorials which show how to set up a 4way CrossFireX system? :D
Thanks for this guys, and apologies for the long post! Cheers!
submitted by badboyant to buildapc [link] [comments]

Sapphire Radeon HD6990 Video Card Review 7970 QUAD-TRI-CROSSFIRE-SINGLE BENCHMARK / BF3 / SKYRIM / ULTRA HD 6990 - Battlefield 4 Litecoin Mining Rig Dual 6990s 1.944 M/hs sec Bitcoin Mining Rig 4X 7970 Watercooled

Somos a vanguarda da informação sobre Bitcoin e altcoins no Brasil. Desde 2013, fazemos iniciantes entenderem o que é criptomoeda e como funciona a blockchain e ajudamos especialistas a tomar decisões de investimento por meio de conteúdo original e notícias relevantes sobre as diferentes moedas digitais. The GTX 1050 Ti 4GB is Nvidia’s latest Pascal based GPU. The 1050 Ti has a TDP of 75 Watts and is based on a new 14nm GP107 processing core which has approximately 66% of the key resources (CUDA cores, texture units, memory bandwidth and transistor count etc.) found on the 3GB GTX 1060. Bitcoin Discussion General discussion about the Bitcoin ecosystem that doesn't fit better elsewhere. News, the Bitcoin community, innovations, the general environment, etc. Discussion of specific Bitcoin-related services usually belongs in other sections. Benchmarks Real world tests of Radeon HD 7970 vs HD 6990. Bitcoin mining Data courtesy CompuBench. Radeon HD 7970. 447.28 mHash/s. Radeon HD 6990. 265.3 mHash/s. Face detection Data courtesy CompuBench. Radeon HD 7970. 49.05 mPixels/s. Radeon HD 6990. 17.28 mPixels/s. Ocean surface simulation Data courtesy CompuBench. At the moment the best graphics cards for mining bitcoins are AMD 5870×6, 5850×6, 6990×3, 7970×3, 5830×6, 7970×3, 5870×4, 6990×2, 6990×2, 6990×2, 6990×2, 5850×4, 6950×4, 6970×3, 6870×4, 6870×4,6 870×4, 6950×3, 5850×3, and all of them ubuntu gui bitcoin miner are capable of having above 1000 Mh/s, meaning over 1Gh/s which is

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Sapphire Radeon HD6990 Video Card Review

GPU Wars: AMD 6990 vs Twin 7970 Video Cards in Crossfire - Benchmarks & Performance - Duration: ... Overclocked AMD Radeon HD 6990 Vs R9 290 - Duration: 3:56. Bang4BuckPC Gamer 31,594 views. GPU Wars: AMD 6990 vs Twin 7970 Video Cards in Crossfire - Benchmarks & Performance - Duration: 2:33. Motherboards.org 43,979 views. 2:33 *NEW* WARZONE BEST HIGHLIGHTS! Quad SLI vs Quad Crossfire Heavyweight Showdown GTX 590 & HD 6990 Linus Tech Tips ... AMD 6990 vs Twin 7970 Video Cards in Crossfire ... Bitcoin Mining Rig 4X 7970 Watercooled - Duration: ... GPU Wars: AMD 6990 vs Twin 7970 Video Cards in Crossfire - Benchmarks & Performance - Duration: ... Newegg TV: GTX 590 vs. Radeon HD 6990 Benchmark Battle AMD XFX NVIDIA EVGA - Duration: 19:20. ***** 1x 6990+ 1x 6950 average hash rate is 1,500 ***** NEW CONFIG 05/12/2013 6990+6950. i sold one of my 6990s. GPU_MAX_ALLOC_PERCENT=100 cgminer --scrypt --thread-concurrency 8192 -o stratum+tcp ...

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