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Help| What PSU should I choose?

let's say that I'm gonna buy a PC with this specifications:
CPU - Core i5-750
Memory - Kingston 2GB DDR3 1333Mhz
HDD - WD Black Edition 640GB 32MB Cache
Motherboard - Asus P7P55D
GPU - Geforce GTS 250 1GB

Does a Thermaltake TR2 RX 450W will be enough to handle the system?
And if not, how much watt are needed?
5 answers Last reply Best Answer
More about help choose
  1. According to http://www.antec.outervision.com/PSUEngine it looks like 450W would be fine but I'd add in some room for if you want to overclock or a lot of fans or any other goodies you might want to have running also.
  2. Best answer
    Hi newcomer and welcome to the Tom's hardware forum.

    The 450W PSU is enough for your system if YOU DON'T WANT make SLI.

    HERE are 5 good 550W PSU, why 550W?, maybe for a future upgrade of your GPU or another components.

    My votes goes in this order:

    1- Coolermaster
    2- Corsair
    3- OZC
    4- Antec BP550
    5- Antec TruePower

    Choose one acording with your budget and brand preference.
  3. saint19 said:


    My votes goes in this order:

    1- Coolermaster
    2- Corsair
    3- OZC
    4- Antec BP550
    5- Antec TruePower


    Why does the Antec TPN make the bottom of your list ?
    It's the most efficient, highest quality build of all your choices, and can provide upto 5 more amps of power on the 12v than the CM.
  4. Just to be sure, Are there more who think this PSU can handle this system?
  5. 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. A high quality 700 to 750 watt power supply with sufficient current (amps) on the +12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.

    A high quality 500 to 550 watt psu will have a +12 volt rail rated at 40 amps. A high quality 700 to 750 watt psu will have a +12 volt rail rated at 60 amps.

    In addition the power supply should be at least 80+ Bronze certified for energy efficiency. There are some models available which have achieved 80+ Silver and 80+ Gold Certifications.

    Corsair, PC Power & Cooling, and Seasonic are some of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. One example would be the Antec Earthwatts series which is a major improvement over Antec’s older psu’s like the Basiq models.

    Here is a link to a technical review of the Thermaltake TR2 RX 450 watt power supply and comparison with other 450 watt power supplies:

    http://www.anandtech.com/casecoolingpsus/showdoc.aspx?i=3146&p=8

    I suggest you read the entire review and pay particular attention to the comparisons with other power supplies. It should become readily apparent the Thermaltake unit is not a stellar performer. Although it costs a little more the Corsair VX450 would be a more appropriate choice.
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