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HD 6970 Crossfire PSU

Hello Guys,

I have a Phenom II x4 955 at 4Ghz and an XFX 6970. I would like to add another 6970 for crossfire and want to know if my PSU would be sufficient for this.
I have a Corsair TX 750V2 Power supply. I will not be overclocking the graphic cards but only the CPU would be overclocked,

My system specs:

Phenom II x4 4Ghz
MSI 790FX-GD70 Motherboard
Corsair Vengeance 16GB DDR3 1600Mhz
Corsair TX 750V2 PSU.

Please help me out as I want to crossfire.
11 answers Last reply Best Answer
More about 6970 crossfire
  1. Hello

    Yes your PSU will be plenty for CF HD6970's (Plus the rest of your system).
  2. Rustyy117 said:
    Hello

    Yes your PSU will be plenty for CF HD6970's (Plus the rest of your system).


    Well, Can I overclock the Cards to 1000Mhz with this PSU and still crossfire without any issues?
  3. Best answer
    Check this review out: http://www.legitreviews.com/article/1488/18/

    With a Core i7 970 (power hungry CPU) and HD6970 CF the power consumption is pushing 600W so I would say you'd have some room for GPU overclocking but nothing too extreme.
  4. Rustyy117 said:
    Check this review out: http://www.legitreviews.com/article/1488/18/

    With a Core i7 970 (power hungry CPU) and HD6970 CF the power consumption is pushing 600W so I would say you'd have some room for GPU overclocking but nothing too extreme.



    Hmm then I will stick to Crossfire without overclocking. One more question mate. My XFX 6970 temps are crazy. The card idles at 48 to 50 degrees and crosses 95 degrees celcius on MSI Kombuster for 2 minutes on auto fan.

    I created a manual fan profile but the card still idles at 45 degrees and still manages to cross 87 degrees. Should I change the thermal paste or what is the issue? When running Battlefield 3, the card went over 84 degrees. I have a corsair 400r case with 7 Scythe Kaze Slipstream 1900 RPM fans but still the card gets hot. Is there anything that I could do?
  5. irfan88 said:
    Hmm then I will stick to Crossfire without overclocking. One more question mate. My XFX 6970 temps are crazy. The card idles at 48 to 50 degrees and crosses 95 degrees celcius on MSI Kombuster for 2 minutes on auto fan.

    I created a manual fan profile but the card still idles at 45 degrees and still manages to cross 87 degrees. Should I change the thermal paste or what is the issue? When running Battlefield 3, the card went over 84 degrees. I have a corsair 400r case with 7 Scythe Kaze Slipstream 1900 RPM fans but still the card gets hot. Is there anything that I could do?


    Yeah they're hot running cards, that's for sure, I would make sure that your case fans are sucking in cold air from the front and bottom of the case and exhausting warm air via the top and rear of the case, I'd also make sure that your cables aren't restricting the airflow (run cables behind the motherboard tray, use cable ties ETC...).
    If that's all good then you could replace the thermal paste, though it will most likely void the warranty.
  6. Rustyy117 said:
    Yeah they're hot running cards, that's for sure, I would make sure that your case fans are sucking in cold air from the front and bottom of the case and exhausting warm air via the top and rear of the case, I'd also make sure that your cables aren't restricting the airflow (run cables behind the motherboard tray, use cable ties ETC...).
    If that's all good then you could replace the thermal paste, though it will most likely void the warranty.


    Well, I only have one exhaust fan. Because there's a 240mm radiator at the top for the CPU. Is there anything that I should change because all the other fans are intakes except the rear one.
  7. irfan88 said:
    Well, I only have one exhaust fan. Because there's a 240mm radiator at the top for the CPU. Is there anything that I should change because all the other fans are intakes except the rear one.


    So the fans on the radiator are intake aswell? If so then I'd recommend changing them to exhaust.
  8. Rustyy117 said:
    So the fans on the radiator are intake aswell? If so then I'd recommend changing them to exhaust.


    No they are exhausts. They are pulling air from inside. I dont have space to install the fans inside on the Rad for pushing airflow. Instead I have placed them outside to pull the air outside.
  9. irfan88 said:
    Hello Guys,

    I have a Phenom II x4 955 at 4Ghz and an XFX 6970. I would like to add another 6970 for crossfire and want to know if my PSU would be sufficient for this.
    I have a Corsair TX 750V2 Power supply. I will not be overclocking the graphic cards but only the CPU would be overclocked,

    My system specs:

    Phenom II x4 4Ghz
    MSI 790FX-GD70 Motherboard
    Corsair Vengeance 16GB DDR3 1600Mhz
    Corsair TX 750V2 PSU.

    Please help me out as I want to crossfire.


    You are going to have a cpu bottleneck my freind!

    I had an Amd phenom 980 @ 4.2 ghz and it bottle necked my gtx 670.

    As soon as I switched to an i5 3570k my framerates sky rocketed
  10. maxh22 said:
    You are going to have a cpu bottleneck my freind!

    I had an Amd phenom 980 @ 4.2 ghz and it bottle necked my gtx 670.

    As soon as I switched to an i5 3570k my framerates sky rocketed



    Dont worry about the Bottleneck for now as I am going to upgrade both my Motherboard and CPU to Piledriver and a Crosshair formula motherboard once its released. But If I crossfire with another 6970, I do not think I would be upgrading the 6970 crossfire for probably another 2 years as it will easily last me 2 to 3 years I believe so.

    No help me out with my airflow buddies. I have 5 intakes and only 1 rear exhaust and 2 top exhausts on the 240 mm radiator.

    Should I have more exhausts as I have only 1 right now.
  11. Best answer selected by irfan88.
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