Radeon R9 HD 7990 Ethash 36 MH/s Overview and ...

New Bitcoin Mining Rig Questions

I've been mining on my 6850 for a few months and I've decided that it's pathetic. I understand that "when ASICs arrive" it will change the entire mining ecosystem, but given the perpetual delays in shipping (at least from Butterfly Labs), I want to build my own GPU powered miner. I have about $4k USD to put into a system (or multiple systems if that's a better idea) and I'd like it to hit at least 3.5 Gigahash/s. So here's my questions:
1) To keep the machine viable as long as possible, it needs to be power efficient. The numbers I've seen on the new 7990 put it at about 1.2 Ghash for 375 watts of consumption (https://en.bitcoin.it/wiki/Mining_hardware_comparison and http://www.tomshardware.com/reviews/radeon-hd-7990-review-benchmark,3486.html) - 3.2 Mhash/watt. Would I see better efficiency numbers from a different card?
2) I understand that mining does not require the card to be in a full speed PCIe slot to get optimal hashing power. If I use a 7990, is the fact that it is a Dual-GPU card going to require more than a 1x PCIe slot? Or, more specifically, how much bandwidth does hashing require per Mhash/s? The answer to that question leads to the last question -
3) If I build a setup with a backplane for additional PCIe slots, how many slots could I realistically add before Windows 7 Ultimate x64 fails to recognize the devices or otherwise derps out? I'm not against setting up with a Linux based system, I just haven't seen appropriate drivers available on that platform. (Side note - do I NEED Catalyst drivers to run an OpenCL miner?)
Any advice or information on suggested builds would be appreciated, and I'll tip helpful people. Thanks!
submitted by Purple_Pandora to BitcoinMining [link] [comments]

For Sale: XFX Radeon R7950 Ghost GPU on cryptothrift

For Sale: XFX Radeon R7950 Ghost GPU on cryptothrift for cryptocoins
Tags: Radeon 7950 290 mining GPU 7970 7990 nvidia r7950 5870
cryptothrift is a Bitcoin, Litecoin and altcoin marketplace and auction site with automated escrow.
submitted by cryptothrift to cryptothrift [link] [comments]

For Sale: Two Water Cooled AMD Radeon HD 7990 With Accessories Video Cards on cryptothrift

For Sale: Two Water Cooled AMD Radeon HD 7990 With Accessories Video Cards on cryptothrift for cryptocoins
Tags: 7990 gpu mining water cooled ltc gaming game amd
cryptothrift is a Bitcoin, Litecoin and altcoin marketplace and auction site with automated escrow.
submitted by cryptothrift to cryptothrift [link] [comments]

[Build Help] Go big or go home; multi-use machine with room for future growth

Per the title, I want to put together something for a variety of purposes, and be able to add on as time goes on.
Uses for the machine:
The 6990 is just a pricewise placeholder: I'm waiting for the 7990. If they're hard to come by, I'll probably start hunting for a second one soon after building the rig. Although, since I don't need Crossfire for mining with multiple cards, I suppose I don't need to have matching cards.
The three 1TB drives are for a RAID 5. I currently have a slow 2TB drive that I'm going to use for weekly backups. I may add an SSD just for those really fast boot times.
I was going to go for three monitors (the (6/7)990 can drive four, yes?) but I don't think I have the desk space. Maybe someday, just to feel like I'm commanding a starship.
Any and all criticisms, suggestions, and substitutions are welcome.
Part list permalink / Part price breakdown by merchant / Benchmarks
Type Item Price
CPU Intel Core i7-3930K 3.2GHz 6-Core Processor $549.99 @ NCIX US
CPU Cooler Corsair Hydro Series H60 74.4 CFM Liquid CPU Cooler $62.24 @ Amazon
Motherboard ASRock X79 Extreme6 ATX LGA2011 Motherboard $268.49 @ Newegg
Memory Crucial 8GB (2 x 4GB) DDR3-1600 Memory $37.99 @ Newegg
Memory Crucial 8GB (2 x 4GB) DDR3-1600 Memory $37.99 @ Newegg
Hard Drive Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive $89.99 @ Newegg
Hard Drive Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive $89.99 @ Newegg
Hard Drive Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive $89.99 @ Newegg
Video Card XFX Radeon HD 6990 4GB Video Card $739.99 @ NCIX US
Case Xigmatek Elysium Black Server Edition ATX Full Tower Case $248.98 @ Newegg
Power Supply Corsair 1050W ATX12V / EPS12V Power Supply $209.99 @ Amazon
Optical Drive LG WH12LS39 Blu-Ray/DVD/CD Writer $69.99 @ Newegg
Monitor Asus VS229H-P 21.5" Monitor $154.98 @ NCIX US
Monitor Asus VS229H-P 21.5" Monitor $154.98 @ NCIX US
Total
Prices include shipping and discounts when available. $2805.58
Generated 2012-04-05 02:35 EDT-0400
submitted by zagaberoo to buildapc [link] [comments]

Bitcoin Mining Speed with ATI Radeon HD 5870 Bitcoin Mining Rig 5x Radeon HD7950 GPU bitcoin mining rig ATI Radeon 5850 x 4 bitcoin miner GPU Mining mit Radeon 5970 (PPCoin + andere Cryptocurrencies) Cgminer Einstellungen Configuring GPU Mining Bitcoin

Przy obecnej trudności (difficulty) wynoszącej 15138043247082 karta wydobywa 0.0000 bitcoin'ów na dzień, 0.0000 bitcoin'ów w ciągu miesiąca, a 1BTC można wydobyć średnio co 26174676 dni. Kopiąc solo kartą Radeon HD 7990 blok (25 BTC) można trafić średnio co 654366906 dni. Radeon R9 HD 7990 graphics card mining profitability ratios, payback period for ETH mining and annual return. All based on live network hash rate statistics and ethereum prices. CryptoCompare needs javascript enabled in order to work. Follow these instructions to activate and enable JavaScript in Chrome. PC. To the right of the address bar, click the icon with 3 stacked horizontal lines. From ... Radeon 7990 Mining Experience Just unboxed our new Sapphire 7990 and aimed it at bitminter - looks like a healthy 1.2 Ghash from this beast of a video card. The 8 game bundle takes a little sting out of the price tag too. Die Radeon HD 7990 dürfte ähnlich liegen, leider waren zu dieser aber noch keine Werte zur Bitcoin-Rechenkraft zu finden. Nominell müsste die Radeon HD 7990 grob die Hälfte mehr Rechenkraft als die Radeon HD 6990 bieten – allerdings könnte die Radeon HD 7990 (durch die extreme Auslastung der Rechenwerke mittels des Bitcoin-Clients) sehr deutlich von der PowerTune-Funktionalität ... The Radeon HD 7990 is a great piece of mining hardware. It has a Hash rate of 36 MH/s, and it consumes 300W at maximum load. It means that you will save money on power consumption. With the Radeon HD 7990, you can make over $700 annually per card. This profit of course changes as the price rate of ether fluctuates.

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Bitcoin Mining Speed with ATI Radeon HD 5870

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