What's the deal with single rail power supplies?

By flowerpower
Apr 22, 2007
  1. I would like to know whether single rail power supplies like the PC P&C PSUs are better than their multiple rail counterparts and why?
  2. wolfram

    wolfram TechSpot Paladin Posts: 1,967   +9

    Well, PC P&C PSU's are always extremely good and reliable. You really can't go wrong with them.

    But some of us prefer dual rail PSU's because they offer more stable voltages. Also, "normal", dual rail PSU's are considerably cheaper than any P&C one :)

    But if you have the cash for a PC P&C PSU, go for it.

    Regards :wave:
  3. flowerpower

    flowerpower TS Rookie Topic Starter Posts: 102

    Yes, i have the cash for it, i was intially thinking of picking up a Silverstone Zeus 850W, but now i'm considering PC P&C Silencer Quad 750 or Enermax Galaxy DXX 850W because they are supposed to be quieter than the Zeus which gets somewhat loud at load.It is difficult to decide between the 2, i like the Galaxy a lot because it's modular and has 8 pin PCI-E connectors for the upcoming R600/G90 cards, but the Silencer is also great. I plan to run 2 8800GTS in SLI eventually so i will need the power of such PSUs thus the question about single rail. Can you give me a example of or recomend a dual rail PSU that will run my system + SLI setup?
  4. LinkedKube

    LinkedKube TechSpot Project Baby Posts: 3,481   +44

    You're concerned about the power rails for g90 cards, but you plan on upgrading to g80sli, If you already dont have g80sli then why are you worrying about power rails for g90 cards
  5. flowerpower

    flowerpower TS Rookie Topic Starter Posts: 102

    Because it would be nice to have a futureproof PSU, i don't want to buy another when i upgrade to G90, does that make sense to you?
  6. wolfram

    wolfram TechSpot Paladin Posts: 1,967   +9

    How much can you afford?
  7. AtK SpAdE

    AtK SpAdE TechSpot Chancellor Posts: 1,495

    When it absolutely positively no questions asked has to be powered.

    But on a more serious note, I can never put any brand of PSU higher then PC Power and Cooling. I have used their products twice. Both rock solid. But Enermax are just right up there as well. The modular design is nice (although I would like to see if there is any power variation/loss with it) The Dual rail is also a plus.
  8. flowerpower

    flowerpower TS Rookie Topic Starter Posts: 102

    Thanx for the tip AtK SpAdE! To answer wolfram's question i can afford any of the power supplies i was considering, probably no more than $300.

    And a little update: PC Power & Cooling updated the Silencer Quad about 10 days ago now it has 2 6 pin PCI-E & 2 8 pin PCI-E.
  9. JimShady23

    JimShady23 TS Maniac Posts: 373


    I own a silverstone zues 650, the thing is a monster. It has more than enough power for my needs and runs flawlessly. It has 4 rails of +12v power.

    I would imagine that there is nothing that that 850watt model could not handle. However as you said, they are rather loud. It is probably the loudest part of my system.

    This is due to the fact that it has only 1 80mm fan to keep it cool.
  10. flowerpower

    flowerpower TS Rookie Topic Starter Posts: 102

    I decided to get the Silencer Quad, in part due to to the fact that it is futureproof. It also has a single 80mm fan like the Zeus, but all reviews i've read describe it as quiet or somewhat quiet so it can't be that bad. I much rather have a rock solid PSU and if it does get a little noisy under load so be it.

    If anyone is interested in getting the revised version with the 2 8 pin PCI-E they can purchased at their site, i doubt that other retailers have it in stock yet since it's so new.
  11. wolfram

    wolfram TechSpot Paladin Posts: 1,967   +9

    That was a good choice :D Enjoy it!
  12. Grafficks

    Grafficks TS Rookie Posts: 302

    In case anybody else is wondering, there's a reason why the PSU industry leader (PC Power & Cooling) is now making only single-rail PSUs:

    Apparently, single-rail PSUs are making a comeback.
    More HERE.
  13. wolfram

    wolfram TechSpot Paladin Posts: 1,967   +9

    Good find Grafficks.

    Anyway, most PSU's have dual +12V rails, and they work pretty well :)
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