4x Radeon HD 7990 Mining Monster Rig (8 GPUs)

Cryptocurrency is a type of digital currency that is based on cryptography. Cryptocurrency uses cryptography for security, making it difficult to counterfeit. Public and private keys are often used to transfer the currency from one person to another.

Cryptocurrency is considered a counter-culture movement related to cypherpunks, who advocate the use of cryptography as a route to social and political change. Cryptocurrency presents a form of this movement in that it is essentially a fiat currency, which means it only has value if people agree to such and use it as a medium of exchange. However, because it is not tied to any country, its value cannot be affected by a central bank. In the case of Bitcoin, the most prominent functioning example of cryptocurrency, its value is determined by supply and demand in the market. As such, this currency behaves much like gold and other precious metals.

Mining Monster Rig – 8 GPUs (4x Radeon HD 7990)

Windows 8.1 and 8GPU’s

Mining Pool and 5MH/s+

Performance (depending on the clock/voltage):

  • Hash Rate: 4800-5600KH/s
  • CPU Usage: 55% (average)
  • RAM Usage: 1.9-2.2GB
  • Power Input: 1740-1970W
  • Power Output: 1500-1800W
  • Temperature: 58-79°C


  • Motherboard: ASUS M5A99X EVO R2.0
  • CPU: AMD Sempron 145 (Single Core 2.8GHz)
  • RAM: Corsair Vengeance 8GB DDR3 1600MHz
  • GFX: 4x MSI Radeon HD 7990 (8 GPUs)
  • PSU: Cooler Master Silent Pro M2 1500W
  • SSD: Kingston 60GB SSDNow V300
  • FAN: Sinbo 18inch Floor Fan (75W)


  • Microsoft Windows 8.1 (64-bit)
  • AMD Catalyst 13.12
  • AMD APP SDK 2.9
  • CGMiner 3.7.2


  • GPU Voltage: 1.050V (1.100V)
  • GPU Clock: 950MHz (1000MHz)
  • CGMiner 3.7.2: -l 13 -g 2 –thread-concurrency 8192

Powered PCI-E Riser:


See also my new article: Cryptocoin (Scrypt) Mining Profitability 2014
Please feel free to leave your comments below!

Author: Marcin Grygiel (First Ever)

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13 Responses to 4x Radeon HD 7990 Mining Monster Rig (8 GPUs)

  1. automobile says:

    Good, very good! But how did you undervolt 7990?! I have a similar configuration, but I can’t undervolt it with Afterburner Beta 18… 🙁

  2. aliosha says:

    there is not concidence between the number of GPU and openCL work…I dont know but, it maybe becouse I replaced my board asrock H81 for asus M5A99X…it is not properly work, I am going to format and reinstall again…

  3. aliosha says:

    ok I will try, but there is something make me crazy…I will try catalyst 14,2 maybe work this time…certainly I´ve been using 14,4 and i got a lot of problem…really I don´t know what I am do…thanks I tell you later whats happen…

    • DO NOT USE 14.4 – it broke one of my PSU. I don’t know why but normal power usage from the wall is 1680-1740W, but after night on 14.4 it was over 1900W (113% usage) and the Hash Rate was the same!

  4. aliosha says:

    I got the same config that you posted before…my PSU 1500 W, I got 4 GPU, HD 7990, really are 6, but 2 of them are make by powercolor, and 4 by sapphire…so it does not matter, becouse I´ve been try to put sapphire in the same rig, I dont want to think about it, becouse, I´ve been trying for two or 3 weeks to get 4 cards working together in the same rig…my motherboard is the same that you posted, like the CPU, 8 RAM…Im really frustrated…

  5. aliosha says:

    it does not work catalyst 14,2 beta v1.3 installed, and the same problem…I turn off 1 card, and let only 2 and the problem was not fixed…the cgminer crashed like I said before..

    –scrypt -o server:port -u username -p password -I 13

    I will try windows 8.1 becouse, right now I dont know what to do…I hate to say this, but I need help…

  6. aliosha says:

    I was regulating –gpu-engineclock 950 and –gpu-memclock 1500, but window turn off every time that i open cgminer…I am downloading win 8.1, maybe it work fine, becouse win 8.0 does not…

  7. aliosha says:

    4 cards: AMD sapphire HD 7990 (8 cores)
    Motherboard: ASUS M5A99X EVO R2.0
    CPU: AMD Sempron 145 (Single Core 2.8GHz)
    RAM 8 gigas
    SSD 120 Gigas

  8. Koko says:

    Can I run 4x HD 7990 cards with 2x 1000W PSU (Corsair or EVGA)?

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