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Which HD7970 to buy for overclocking?

Hi. I have read online that some 7970s are getting voltage locks. What would be the best for overclocking? Do i even need to up the voltage for a increase on the 7970?

Right now i got a hd7870 at 1175/1375 without touching the voltage. If i go to 1200 i crash/BSOD.

Any info would be greatly appreciated :) Oh here is my specs just for any extra info. If you need to know something else lemme know.

Motherboard: Asus rampage extreme 2
Computer case: CM Storm trooper
Processor: Intel core i7 920 OC'd to 3.3ghz(going to 4ghz soon)
CPU fan: Noctua NH-D14
Power supply: Delta ps2 ex 750w(Getting a corsair 750w because this one is REALLY old)
Graphics card: HD7870
RAM: 6x2gb brand is elpida or something.
OS: Windows 7 64bit
4 answers Last reply Best Answer
More about which hd7970 overclocking
  1. The best one seems to be the vaporx.
  2. lt_dan_zsu said:
    The best one seems to be the vaporx.

    Any specific reasoning behind that? or just personal preference?
  3. Best answer
    It has a very large heatsink, it has high clocks to begin with. I believe sapphire is better with letting you do higher voltages as well. The gigabyte one looks like it has a pretty good heatsink as well.
  4. Best answer selected by rvdman306.
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