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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 ( and,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]

Do I need a bigger PSU for my build? (FX-8320 + 7990)

So I just recently upgraded my old bitcoin miner into a gaming PC. It used to have a really crappy CPU so I replaced it with something a bit more up to date. After I got it all up and running I tried to play GTA V and it worked really well at first, looks great, plays smoothly, the only problem is that after playing for awhile my computer will randomly go black and freeze and the only way to do anything is to do a hard reset.
I also noticed that when I tried to overclock it I could never really get a stable clock. And then when I tried to use the automatic OC tool on my mobo, it literally fried my PSU. It was a Corsair RM850, I had to RMA it but I ordered a new PSU to replace it while I wait, and this one is only a 750w. I got it to power my build but I am still getting the same freezing that I was on the old PSU. I'm not sure if its a problem with the power supply or not because when it does freeze the fans and everything are still on and spinning really fast.
It could possibly be a problem with overheating but I have 3 fans on my 7990, aftermarket cooling on my CPU, and 3 case fans, and the side panel is off (but it's still right next to a wall). I'm also not overclocking it at all. The case might not have the best airflow in the world but it doesn't seem like it would be that restricted.
Basically what I am wondering is can an 850w power supply normally power a computer with these specs and also remain stable while overclocked?
CPU: 8-Core AMD FX-8320
GPU: XFX Radeon HD 7990
2 HDD, 1 SSD
24Gb Ram
PSU: Corsair RM850 (850w)
Obviously it can power it while not at max capacity, but whenever it is being pushed to the limit it seems like it fails on me. I'm wondering if it is necessary or not to upgrade to a 1000w+ PSU or if this problem is probably being caused by something else like overheating?
Thanks in advance for any help!
tl;dr is a 850w power supply big enough to handle this build when fully overclocked?
submitted by CareerDrugUser to buildapc [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
Prices include shipping and discounts when available. $2805.58
Generated 2012-04-05 02:35 EDT-0400
submitted by zagaberoo to buildapc [link] [comments]

Mining Rig with Radeon 7990 HD Radeon 5850x4 bitcoin miner - YouTube 4x Radeon HD 7990 Mining Monster Rig (8 GPUs) 7x Radeon HD 7990 Mining Monster V2 Rig (14 GPUs) Fast and Compact Litecoin mining rig with AMD Radeon 7990 GPU = 1.2MH/s

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. AMD Radeon HD 7990 vs. NVIDIA GeForce GTX 1060 Click to Compare. AMD Radeon HD 7990 vs. NVIDIA GeForce GTX 1070 Click to Compare. AMD Radeon R9 290 vs. AMD Radeon RX 580 Click to Compare. AMD Radeon R9 290 ... 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. MinerGate GUI v. 5.08 launched – AMD GPU mining. by Janika Kouki February, 19, 2016. V 5.08 of our software with AMD mining and multiple GPU mining released. Download it here to explore all the new features.. What’s new: Radeon HD 7990. kHps: 1125 Core Clock: 1075 MHz Memory Clock: 1700 MHz Sapphire Radeon R9 290X. kHps: 990 Core Clock: 900 MHz Memory Clock: 1350 MHz Sapphire Radeon R9 290X. kHps: 882 Core Clock: 950 MHz Memory Clock: 1500 MHz Radeon HD 6990. kHps: 850 Core Clock: 880 MHz Memory Clock: 5000 MHz GIGABYTE Radeon R9 290 . kHps: 830 Core Clock: 1000 MHz Memory Clock: 1250 MHz Radeon HD 5970. kHps ...

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Mining Rig with Radeon 7990 HD

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