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Powercolor LCS HD 6990 4GB Review



Testing of the PowerColor HD 6990 LCS will consist of running it and comparison cards through the OverclockersClub.com suite of games and synthetic benchmarks. This will test the performance against many popular competitors. Comparisons will be made to cards of equal and greater capabilities to show where they fall on the performance ladder. The games used are some of today's newest and most popular titles to give you an idea of how the cards perform relative to each other.

The system specifications will remain the same throughout the testing. No adjustment will be made to the respective control panels during the testing other than applying the AA and AF settings manually in the control panel. I will test the cards at stock speeds, then overclocked in order to see the effects of any increases in clock speed. The cards are placed in order from highest to lowest performing in the graphs to show where the cards fall by comparison. In addition to the stock testing, I will include performance testing in both Surround (NVIDIA) and Eyefinity (AMD) with the appropriate cards.



Comparison Video Cards:



  • PowerColor HD 6990 LCS 1002/1488MHz

My expectation for the PowerColor HD 6990 LCS was that it would overclock better than a reference-cooled HD 6990. In that respect, I was glad to see that the additional cooling was worth another 50+MHz over the reference cooling solution for a maximum speed of 1002MHz on the pair of Cayman XT cores. To run this number, it took a voltage bump up to 1250mv. Usually that brings on another challenge with increased heat, but the EK full-cover block assuages those fears. In all, I was able to squeeze a 122MHz bump (+14%) over the 880MHz clock speeds on the cores and a 238MHz bump (just over 18%) on the GDDR5 memory. The increased clock speeds definitely help with increasing FPS in games. The biggest upside for me, besides the higher clock speeds, is that the horrendous fan noise is gone at the upper edges of the clock speed range. This lack of fan noise was great, but it allowed me to hear the chokes in the power circuit screaming like stuck pigs when I put the screws to it. The PowerColor HD 6990 LCS is built with a reference card as the base, so this really is not a huge surprise. All in all, the reason for a liquid-cooled card pays off here with tangible increases in clock speed and therefore performance.


Maximum Clock Speeds:

Testing for the maximum clock speed consists of looping Crysis Warhead and Unigine 2.5 for 30 minutes each to see where the clock speeds will fail when pushed. If the clock speed adjustment fails, then the clock speeds and tests are rerun until they pass the full one hour of testing.



  • Gaming Tests:
  1. Aliens vs. Predator
  2. Metro 2033
  3. HAWX 2
  4. Just Cause 2
  5. Unigine Heaven Benchmark 2.5
  6. Mafia II
  7. Battlefield: Bad Company 2
  8. Lost Planet 2
  9. 3DMark 11
  • Usage:
  1. Temperature
  2. Power Consumption

  1. Introduction & Closer Look
  2. Closer Look (The Video Card)
  3. Specifications & Features
  4. Testing: Setup & Overclocking
  5. Testing: Aliens vs. Predator
  6. Testing: Metro 2033
  7. Testing: HAWX 2
  8. Testing: Lost Planet 2
  9. Testing: Unigine Heaven Benchmark 2.5
  10. Testing: Just Cause 2
  11. Testing: Mafia II
  12. Testing: Battlefield: Bad Company 2
  13. Testing: Futuremark 3DMark 11
  14. Testing: Temperatures
  15. Testing: Power Consumption
  16. Conclusion
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