Need PSU Advise

hello. i need advise to see if i need a more powerful psu. at the mo have a 550WAtt HEC (high-Quality Evolution
Commintment) PSU.

my specs at the moment are:

1X AMD Athlon black edtion 2.7 GHz Processor

1X GigaByte M61PME-S2

1X Maxtor HDD SATA

1X Pioneer IDE Disk drive

1X Nvidia 9800GT

1X Belkin FD9000 Wifi Reciever

My GPU is my main worry. my PSU holds a DualRail 12V. channel 1 is a 18A rail and channel 2 is a 17A rail.
a bloke at CEX told me i need atleast a 750Watt PSU to power a 9600GT PSU. i have a 9800GT so i wonder if my PC is getting fried. my CPU is running Fast with no glag. my GPU i processing crysis Warhead on high like a charm, only at 60*C. i'm 70% i'm alright i just want to feel 100% alright.

also i am going to buy a new SATA Diskdrive next week so i can have two IDE connection Free, so i would like to put two Extra IDE Harddisk to my PC. Will this take it to Far for 550Watts
11 answers Last reply
More about need advise
  1. a quality 550 watt will power any single card the guy who said 750 watt is talking crap even a quality 450 watt will power a 9800gt
  2. ^5 +1 what obsidian86 said.

    The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the 12 volt rail(s) can easily power a system with any single video card made.

    Technical reviews right here at Tom's Hardware, AnandTech, and Xbit Laboratories indicate that the total power draw at the wall outlet (mains) during a gaming session such as World of Warcarft for a moderately overclocked system with one video card is typically just a little bit under 300 watts. That is total power for all of the components. There are a few exceptions.
  3. Cheers that's great to know but What about installing 2 Extra IDE hard drives?
  4. HuH!
    I am running a 9800GT on a 400W PSU(Corsair) with EASE.

    Thats more than sufficient.
  5. the 550 is fine
  6. A quick and dirty "rule of thumb" is to take 50%
    of the rated wattage of any PSU, and make a
    decision if that 50% will satisfy the system
    you are planning to build.

    This rule of thumb takes into account
    PSU efficiency, single- v. multiple-rails,
    probable future expansion, and a
    subjective desire to avoid spending
    too much time on this decision.

    Thus, if you are considering a 550W PSU,
    then the system you are building should
    consume about 275 W.

    As Dell discovered many years ago,
    lots of systems can be powered reliably
    with PSUs that are rated lower than what
    the IT industry's marketing geniuses urge
    upon us: that's because PSU makers
    enjoy huge profit margins on their larger PSUs. :)

    The next level of analysis should take
    into consideration the rated efficiency
    of any PSU, at an average 50% utilization.

    Statistically, most PSUs will experience
    maximum effiency at or near 50% utilization --
    which is another common sense reason
    for our "rule of thumb".

    So, compare 500W @ 80% with 450W at 89%.
    Even though the latter may cost somewhat more,
    the former was probably built with inferior components.

    Also, a more efficient PSU will waste less energy,
    over time, and the whole planet will benefit
    as more people buy power-efficient electronics.

    The next level of analysis takes into account
    single- versus multiple-rails, modular versus
    non-modular cables, and other considerations
    such as the space available in your chassis:
    some PSUs impinge on fan grills in the bottom
    panel.

    BEST WAY is to start planning early, then
    to look for sales, free shipping and such,
    on one or more of your preferred selections.

    Newegg, for example, has a feature which
    permits you to receive an email notice
    if/when the price for any given product
    goes below a user-specified threshold.

    It's probably a good idea to install your PSU early
    e.g. first when assembling your system,
    in order to plan and implement cable routing
    to effect maximum air flow. This is another
    reason to get your research done early.


    Hope this helps.


    MRFS
  7. > What about installing 2 Extra IDE hard drives?

    Assume 10W each, for planning purposes.


    MRFS
  8. the 550 will be fine drives aren't as power hungry
  9. shubham - You are quite correct. The general rule of thumb for a single video card inlcudes all video cards made not just the 9800GT.
  10. MRFS said:
    A quick and dirty "rule of thumb" is to take 50%
    of the rated wattage of any PSU, and make a
    decision if that 50% will satisfy the system
    you are planning to build.
    MRFS

    The entire post is way to much to include in the quote, but very well put.
  11. JohnnyLucky said:
    shubham - You are quite correct. The general rule of thumb for a single video card inlcudes all video cards made not just the 9800GT.



    OP Has a 9800GT.
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