Kind of confused with something written on some PSU

By ilim4t1c ยท 6 replies
Jun 22, 2008
  1. Ok, some of the PSUs that ive been looking at have been saying 12V V2.01 and honestly, i don't care what it means, but i just want to know if these types PSU's will be needed for this Mobo/Video card

    Mobo (Can't link stuff yet, havent posted 5 times yet :()
    BIOSTAR A770 A2+ AM2+/AM2 AMD 770 ATX AMD

    Video Card
    ASUS EN8800GT/G/HTDP/512M GeForce 8800 GT 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

  3. raybay

    raybay TS Evangelist Posts: 7,241   +10

    It is an Intel "guide" for power supplies, but has been "adopted" by United Laboratoreies and the English EN 60950.

    Actually, the 12V 2.01 is the design specification released in June, 2004 which updated the ATX12V power supply specification. The "2.01" means that it is Version 2.01 of the specification, and that the ATX 12V specification has been updated to 2.01 so that it will fully power PCI-Express devices.
    Not that it really makes any difference, but to bore you... The newest power supplies, are version 2.03. Newegg and others post the version because it is the easiest way to know what you are getting. Some new boards will require 2.03, but most specifications are intended to provide direction for future requirements.
    These are part of the US UL, and English EN 60950 engineering specification standards that are used pretty much world wide...
    "System components that use 12V are continuing to increase in power. In cases where expected current requirement is greater than 18A, a second 12 V rail should be made available. ATX12V power supplies should be designed to accommodate these increased
    +12 VDC currents."
    "Minimum measured efficiency is required to be 70% at full and typical (~50%) load and
    60% at light (~20%) load. New recommended guidance has been added to
    The 2 x 10 main power connector has been replaced by a 2 x 12 connector. This was made to support 75 watt PCI Express requirements. Pinout assignments are based on the SSI recommendation.
    With the added 12V, 5V, and 3.3V pins the need for an Aux Power connector is no longer
    needed and the guidance for this connector has been removed.
    The 12V rail on the 2 x 2 power connector should be a separate current limited output to meet the requirements of UL and EN 60950.
    Almost gobbledygook, but important stuff for designers. The guide is updated yearly, anticipating the future, so that all manufacturers are on the same page.
  4. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    Thanks for the clarification Raybay
  5. ilim4t1c

    ilim4t1c TS Rookie Topic Starter

    Thanks for the advice, but all i wanted to know is if i NEEDED one of these PSU's with the 12V i or no?
  6. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    I would say yes. That 8800 is power hungry
  7. ilim4t1c

    ilim4t1c TS Rookie Topic Starter

    Thanks a lot for the advice guys..and the quick responses
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