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Radeon 6870 not displaying anything

I am building my first build with a friend who has experience and as we finished building, nothing on the monitor came up when we booted the pc up. We need to boot the computer into BIOS and install Windows 7. We used a VGA cable from the motherboard into my current monitor and also tried using a HDMI cable from the graphics card into my TV. The motherboard and the other components seem to be working (Fans, CD drive, graphics card fans, CPU Cooler, etc.)

The Graphics card is an XFX AMD Radeon 6870, which we plugged into the PCI-express slot. The thing is that I used a power supply by Thermaltake which is only 430 watts. This PSU only had 1 6 pin connector and we need 2 so we went to Microcenter and purchased a 2-molex to 1 6 pin connector. Is this adapter and/or the PSU the problem?

We were planning on returning the PSU and buying a new one that has 2 6-pin connectors, but wanted to ask people first.
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  1. Radeon HD 6870 - 28A and a 500W PSU minimum

    http://forums.pureoverclock.com/graphics-cards/11999-gpu-power-requirements.html

    Is this your psu?

    http://www.thermaltake.com.au/products-model.aspx?id=C_00001773

    if so the max output on 12v rail is 20amps, i would say it’s your psu not providing enough power.
  2. My PSU is actually the Thermaltake TR2 Bronze 430w, which is not on on their website for some reason. Time to return it.
    Here is a link: http://www.newegg.com/Product/Product.aspx?Item=N82E16817153023
    Thank you very much anyways.
    I was looking through this guide:
    http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems
    and started panicking because nothing else worked. Good thing it was only a PSU issue (I hope).
    I'm ordering a new PSU tomorrow.
  3. Best answer
    this one? http://www.thermaltakeusa.com/Product.aspx?C=1247&id=1541#Tab1

    efficiency is only 65%, max 20 amperage. Not suited for your system at all.

    I recommend not skimping on the psu department and doing you a favour by getting a quality brand ie; Corsair, Seasonic, PC Power & Cooling at least 600w and 80plus or higher certification for an efficient power supply.
  4. boju said:
    this one? http://www.thermaltakeusa.com/Product.aspx?C=1247&id=1541#Tab1

    efficiency is only 65%, max 20 amperage. Not suited for your system at all.

    I recommend not skimping on the psu department and doing you a favour by getting a quality brand ie; Corsair, Seasonic, PC Power & Cooling at least 600w and 80plus or higher certification for an efficient power supply.



    Okay, thanks man. I can't wait to actually play Borderlands and League of Legends on my new PC.
  5. Best answer selected by CraftyBooze.
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