PSU for AMD Phenom 965 & ATI HD 5770

This is quite a simple one. I have two questions; how much power will be required by the specifications listed below (bearing in mind limited future expansion such as graphics card) and which brand of PSU is known to be more reliable and/or safe (which, in my books, also indicates general quality)?

Processor: AMD Phenom II X4 965 3.4GHz Black Edition.
Graphics card: XFX HD 5770 XXX 875Mhz 1GB GDDR5.
Drives: 1 DVD RW, 1 SATA 7200rpm HD.
Other power drains: 2 USB HD's, Antec 300 with 3 extra case fans.
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More about phenom 5770
  1. Sorry, forgot to add a rather important part. :whistle:

    RAM: Kingston 4GB (2x2GB) DDR3 1600MHz
  2. Hi, here are the system requirements for the 5770.

    ATI Radeon™ HD 5770 System Requirements

    PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
    450 Watt or greater power supply with one 75W 6-pin PCI Express® power connectors recommended (600 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)
    Certified power supplies are recommended. Refer to for a list of Certified products
    Minimum 1GB of system memory
    Installation software requires CD-ROM drive
    DVD playback requires DVD drive
    Blu-ray™ playback requires Blu-ray drive
    For an ATI CrossFireX™ system, a second ATI Radeon™ HD 5770 graphics card, an ATI CrossFireX Ready motherboard and one ATI CrossFireX Bridge Interconnect cable per graphics card (included) are required

    So, with the processor, ram and other componets a 550W PSU is enough if you don't want Crossfire. Antec 550W Plus Bronze certified
  3. Here are the official ATI recommended power supply requirements for the ATI Radeon HD 5770 and 5750 video cards:

    450 watt or greater power supply with one 75 watt, 6-pin PCI Express® power connector recommended.

    600 watt or greater power supply with two 75 watt, 6-pin PCI Express® connectors for ATI CrossFireX™ technology in dual mode.

    The recommendations are for an entire pc system.

    Corsair and Seasonic are two 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.
  4. Thanks guys :). I'll go for a 550W PSU then. I was first told to go for a 650W but that was for future Crossfire capability.
  5. JackNaylorPE said:

    Well now you've made me change my mind again. :P :lol:

    I'll pick out a 650W from those lists. I tried to size it using the link you gave my but it came to too low a wattage (300). The graphics card that I have chosen requires 450W, so I'm not sure how it came to the conclusion of only 300W. I'm a bit of a future-proofer so 650W is enough for future mods.

    Thanks for your information. :)
  6. FYI
    rather then having a bunch of computer geeks test electrical equipment and then give you their opinions on it, these guys actually test PSU with EE backgrounds. They do an awesome job of it.
  7. Hi again, the Antec TruePower 650W looks like a good option for your needs of Crossfire.
  8. A 550W from companies like Corsair, Seasonic, Antec will do you good, but get 600W+ in case you want to crossfire
  9. The mobo I'm looking at doesn't support crossfire (not enough ports). I'm happy just to buy a better card later on...

    I may still go for 650W for the price different of a couple of £/$'s. At least that allows for future enhancements.

    I appreciate all the opinions - thanks!
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