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BP500U support 6790 CF?

Hi guys, new to these forums.

I have the Antec Basiq 500W(BP500U)
Can it support 2 6790s?

It has a (6+2) and a (6) PCI-E connectors on the same cable
10 answers Last reply Best Answer
More about bp500u support 6790
  1. It's going to be close. Use the PSU calculator below to determine the power supply required based on other components as well.
    http://www.extreme.outervision.com/psucalculatorlite.jsp

    The fact that the PCIe connectors are on the same 'cable' isn't necessarily bad. The wires in the cable should be split between the 2 rails for load balance.
  2. Best answer
    For a system running with two Radeon HD 6790 graphics cards in 2-way CrossFireX mode AMD specifies that the power supply have a minimum of 600 Watts or greater with a combined +12 Volt continuous current rating of 37 Amps or greater and with at least four 6-pin PCI-Express Supplementary Power Connectors.

    Your Antec Basiq 500 Watt (BP500U) is unable to meet the minimum requirements. The reason is that the PCI-Express Supplementary Power Connectors cable is all on one +12V rail while the other +12V rail is strictly used to power the motherboard and CPU. That +12V rail, that the PCI-Express Supplementary Power Connectors cable is connected to, is also being used to power all of the peripherals like CD/DVD/BR drive, HDDs, SSDs, CPU cooling fan, case cooling fans, etc. The current limiter on that rail limits it to an absolute maximum of 20 Amps which is insufficient for the two Radeon HD 6790 graphics cards and all of the peripherals. The power supply also doesn't have the requisite four 6-pin PCI-Express Supplementary Power Connectors needed for the two Radeon HD 6790s.

    What is your power supply budget amount for this upgrade?
  3. Would a 560 ti instead work for this PSU?
  4. Zav said:
    Would a 560 ti instead work for this PSU?

    A single GeForce GTX 560 Ti graphics card should work fine.
  5. Alright, I'll just get that
  6. Best answer selected by Zav.
  7. I'm assuming that you won't be overclocking your GTX 560 Ti or running some GPU stress testing utility like FurMark or OCCT GPU stress tester. If you do choose to overclock the GTX 560 Ti then you may trigger the 20 Amp current limiter on that +12V rail.
  8. Combined +12V rails make 432W, So 432 - Whatever my CPU + Motherboard is using = Left over watts for graphic card?

    Just a guess there
    or I'm completely wrong?
  9. Zav said:
    Combined +12V rails make 432W, So 432 - Whatever my CPU + Motherboard is using = Left over watts for graphic card?

    Just a guess there
    or I'm completely wrong?

    Anything that the CPU and motherboard doesn't use really isn't available for the graphics card and peripherals to use in the case of the Antec Basiq 500 Watt (BP500U).

    Each +12V rail is absolutely limited to 20 Amps on each rail.

    E.g. if the CPU and motherboard are drawing 132 Watts (11 Amps) from its +12 V rail the unused capacity of 108 Watts (9 Amps) is not available for use by the other +12V rail powering the graphics card and peripherals.

    Hardware Secrets review of the Antec Basiq 500 Watt (BP500U) shows that you can't draw more than 20 Amps from each rail. Any attempt to draw more than 20 Amps from either of the +12V rails triggered the over current protection circuit.

    http://www.hardwaresecrets.com/article/792
  10. Hmm..
    Alright, I won't OC the 560 ti
    Thanks a lot for the info/help!
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