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PSU req.

Hello;

I've been searching all around the net for one week to get an answer.

I have the following components:

i5-760
gigabyte p55a-ud3 (8pin cpu power)
win 7 ultimate x64
8gb (2 x 4gb) kingeston 1333Mhz
2 hdd
1 dvd+-RW
gigabyte GTX 560 (2 x 6pin power)

I plan to oc cpu + vga in the future.

what is the recommended psu (with amperage on 12v rail for both rails = 2 x 6pin power connectors) for all the above please?

I have two choices either:

Thermaltake W0355RE Litepower 600W http://www.thermaltake.com/products-model.aspx?id=C_00001775
or
Thermaltake W0356RE Litepower 700W http://www.thermaltake.com.au/products-model.aspx?id=C_00001776
9 answers Last reply Best Answer
More about tomshardware
  1. First with 600W is good.
  2. There is a simple formula.
    Add each component power requirements, the total would give a true estimate of your power needs. (also remember that you should always buy more than you think you need)

    Example: if all your components total power requirements are say 500 watts +/-
    then you should consider at least 200+ more power than you "need" at the moment to insure that you can still upgrade/add other components in the future.

    Also ALL power supplies advertised power is ALWAYS lower than advertised.
  3. SeaSonic M12II 520 ~$90
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817151093

    Seasonic can't go wrong... they manufacture PSU for Corsair and XFX... What more can I say. 520W is more than enough for your system, unless you are going super insane OC with custom liquid cooling system...
  4. sosofm said:
    First with 600W is good.

    hello sosofm;

    thanks for replying.

    so that 600w psu is enough eventhough i want to overclock in the future?

    also at techpower they reviewed the gigabyte gtx560 and said it draws 400w on load, so that would be enough too on 12v1=25A and 12v2=20A?

    regards...
  5. drwho1 said:
    There is a simple formula.
    Add each component power requirements, the total would give a true estimate of your power needs. (also remember that you should always buy more than you think you need)

    Example: if all your components total power requirements are say 500 watts +/-
    then you should consider at least 200+ more power than you "need" at the moment to insure that you can still upgrade/add other components in the future.

    Also ALL power supplies advertised power is ALWAYS lower than advertised.

    hello drwho1;

    thnx but how to calculate each component power requirement?
  6. Jesus, I must have at least quote this page 5 times in one hour ^.^"
    Even a system running 2500k (OC) and GTX460 SLi doesn't use more than 500W

    http://www.tomshardware.com/reviews/overclock-cpu-ssd,3027-13.html

    You do not need 600W PSU, unless you super heavily OC your CPU and GPU and have a custom liquid cooling solution...
  7. Best answer
    There is no problem with getting more then you need. Well if you get WAY more then you need your efficiency drops(more power wasted, but no other negative effects on modern power supplies).

    My H55N USB3 + i5 750 system takes more power with an Antec EA650 then and FSP 300.

    My 2600K @ 4.4 and 5870 has trouble taking 300 watts from the wall(it has a 850 watt power supply, yes its overkill)

    That said a GTX 260 can in theory take over 200 watts(but will stick in the 150-160 area more often then anything when playing games) so a 600 watt power supply is not extreme overkill.

    http://www.techpowerup.com/reviews/Palit/GeForce_GTX_560_2_GB/25.html

    Please note not ALL power supplies are built the same. Some deliver more the needed 12 volt power needed by modern systems then others. This is the most important number on a power supply.

    There are 450 watt power supplies out there that deliver under 200 watts of 12 volt power, so the wattage alone is not enough to ensure a stable system.

    Efficiency NOT a requirement

    For efficiency, You want a power supply that is 40-50% overpowered(for your average use, so if your system takes 150, you want 250-300 if you take 250, 500 is fine) if you want maximum energy savings(this is a function of the transformer that drops the household 120/240 volts to 12).

    Thermaltake does not mention exact 12 volt max on there site so my best guess is between 375-400(based on the listing of max 3.3 and 5 being taken right off the top. Many power supplies list the combined 12 volt rating) watts of 12 volt power. That is in fact a 500 watt power supply with a MAX of 600, but not sustainable.

    http://www.thermaltake.com/products-model.aspx?id=C_00001775

    This should be fine for your system.
  8. go with the 600w. all you have to do is add up all the parts power needs and there you go u get what u need
  9. Best answer selected by jhafner.
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