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]

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]

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]

AMD HD 7990 6GB Video Card Hands-On! Battlefield 1 -Radeon HD 7990 + I5 4570 + 16gb RAM 7990 ethereum claymore 1500 7x Radeon HD 7990 Mining Monster V2 Rig (14 GPUs) Introducing the AMD Radeon™ HD 7990

Radeon R9 HD 7990. A Radeon R9 HD 7990 will cost you $680. Its power cost per day is lower than the R9 295X2 at $1.08 but its hash rate is significantly lower at 36 MH/s. Its return per day is $1.29 while its cost per MH/s is $18.89, giving it a return per year of $469.40. Radeon RX 480 xfx radeon hd 7990 triple dissipation 6GB. zie de kaart op youtube . XFX Radeon 7990 Series cards - The Performance Crown Has A New King! No competitor comes close to this performance and if any one wants a true competitive gaming edge, the XFX Radeon HD 7990 is the best solution bar none... NVIDIA Quadro T1000 vs AMD Radeon HD 7990. Comparative analysis of NVIDIA Quadro T1000 and AMD Radeon HD 7990 videocards for all known characteristics in the following categories: Essentials, Technical info, Video outputs and ports, Compatibility, dimensions and requirements, API support, Memory. Radeon R9 HD 7990. The Radeon HD 7990 has a hashrate of 36 MHz/s, which is the second largest hash value in the R9 series after 295X2. During mining, the Radeon R9 HD 7990 consumes about 300 watts of electricity, and it can be purchased for about $320-350. Radeon R9 HD 7990 The r9 295×2 hashrate is 36 MH/s which is the second highest rate among the best cards for ethereum mining, second only to Radeon R9 295X2. If you looking to built the best ether mining hardware, then you have to have this card.

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AMD HD 7990 6GB Video Card Hands-On!

Today we're looking at a graphics card I've been trying to find a great deal on for a while, the Asus Radeon HD 7990. Combining the power of two 7970s this dual GPU powerhouse once retailed for $1000. Subscribe for the Review! Elric's out sick, but he was able to get his hands on AMD's monstrous Dual-GPU HD 7990 6GB Video Card! Battlefield 3, Crysis 3 and comparisons against NVIDIA's GTX 690 ... Subscribe to this channel (NAHUEL LUIS) so I can buy food for my cats and dogs thanks. Suscribete a este canal (NAHUEL LUIS) para que le pueda comprar comida a mis gatos y perros gracias., AMD Radeon HD 7990 Overview - Duration: 4:10. Paul's Hardware 13,265 views. 4:10. HD 6870 Revisited! Full Clean and Gaming Benchmark - 1440p on the Cheap?! - Duration: 9:09. http://buytradebitcoin.net Buy and Trade Bitcoin Checkout My Book on Amazon https://www.amazon.com/Lewis-Culbreat... Growing Your Business Through Social Med...

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