Need help choosing Power Supply

Hey all,

I am building a new system and I have ordered all the components. I currently have an X-navigator case and a power supply. I want to know whether you guys think that this power supply will suffice or whether I should upgrade to another one.

Let me list the new system specs for you:

Case: APEVIA X-Navigator ATXA8NW
Motherboard: GIGABYTE GA-EP35-DS3L LGA 775 Intel P35 ATX Intel Motherboard
CPU: Intel Core 2 Quad Q6600 Kentsfield 2.4GHz 2 x 4MB L2 Cache LGA 775 Quad-Core Processor
Video Card: EVGA 512-P3-N841-AR GeForce 8800GTS (G92) 512MB 256-bit GDDR3 PCI Express 2.0 x16
RAM: OCZ Reaper HPC Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit
Hard Drive: Seagate Barracuda 7200.11 ST3500320AS 500GB 7200 RPM 32MB Cache SATA 3.0Gb/s Hard Drive
CD-ROM: I have a DVD-RW and a DVD-ROM but I doubt these will affect the PSU as much as other components.
PSU: Thermaltake Purepower W0100RU 500W ATX 12V 2.0 Power Supply 115/ 230 V UL, CUL, TUV, FCC, and CB certification

I am wondering if that PSU will be alright for this system. I am not CURRENTLY going to overclock the system BUT if I decide to do so within the next month or 2 months, would I need to get a different power supply anyway? If so, then I may as well get one NOW and install it.

Here is the PSU I was lookin at getting. However, it may be a little overkill @ 700W.
-OCZ GameXStream OCZ700GXSSLI 700W ATX12V Power Supply 100 - 240 V

Please let me know what you think. If you have any other PSU suggestions, I would love to hear them. I have looked at the PSU ranking chart/post or whatever but I want actual PEOPLE'S opinions. Thanks for taking the time to read my post!
11 answers Last reply
More about need choosing power supply
  1. Go here and use the "eXtreme Power Supply Calculator Lite v2.5"

    Looking at your specs for your new build, I would advise getting new psu. The OCZ one you have is good, but you should look at either of these from Corsair.



    But if you need to future proof psi for upcoming graphic cards that need 8 pin pcie connector then I suggest these two.

    PC Power & Cooling Silencer 750 Quad


    IMHO you should go for the 750w Corsair since it is future proof for newer 8pin pcie graphic card power connectors.
  2. Well, the one I have right now is NOT a OCZ. I have the thermaltake 500W.

    Everybody on the site seems to suggest the corsair one and since its the same price as the OCZ one I was talking about, I don't know which one to get. The extreme power supply calculator game me a needed wattage of like 328W so I think my current 500W one will suffice. But anyhow,

    Here is the breakdown of the 3 power supplies in question:

    A) Thermaltake 500W: +3.3V@22A,+5V@32A,+12V1@14A,+12V2@15A,
    -12V@0.3A, +5VSB@2A

    B)OCZ GameXStream 700W:+3.3@36A,+5V@30A,+12V1@18A,+12V2@18A,+12V3@18A,+ 12V4@18A,-12V@0.8A,+5VSB@3.0A

    C)Corsair 650W:+3.3V@24A,+5V@30A,+12V@52A,-12V@0.8A,+5VSB@3.0A

    So thermaltake has 2 12v rails, OCZ has 4 and Corsair has only ONE but at a really high amperage.

    So anybody got suggestions?
  3. I can not seem to find enough information to see whether my current PSU, the thermaltake 500W will suffice for my 880GTS card?

    Does anybody have a similar setup as mentioned above and would like to provide input?
  4. Are you planning on going SLi in the future?
  5. No, im not planning on going Sli. I just bought a 8800GTS and the most I will do is use the EVGA step-up program to get the next gen cards that come out in like a month... .

    So taking that all into account, would the 500W PSU be alright?

    actually MORE IMPORTANTLY, if the PSU fails/gets blown out, will it damage the other components or will I just be able to order a new PSU once the old one dies without any components being destroyed?
  6. Yes it can, a PSU fault can load out your whole system. A reliable PSU is seriously one of the most vital components of your setup. Just for that setup i would reccomend something around the 580-600W mark, but if your going to OC in the future I would highly reccomend 650-750W

    So that OCZ GameXStream is going to suit your needs perfectly, especially with you wanting to step up to the next gen cards I would most definantly purchase it
  7. Thanks!

    From what I have read and researched, most people on this site have suggested that I use the Corsair HX, VX or TX models instead of the OCZ GameXStream. The only difference I can see is that the Corsair PSUs use only one +12V rail while the OCZ one has 4 +12V rails.

    Apparently, 1 rail > 4 rails so if I'm gonna spend the same money on OCZ or on Corsair, Corsair might be the way to go!

    Thanks for the input! If you are highly suggesting that I change from my 500W to a 600+W PSU, I will take that into consideration. But otherwise, I may stick with this Thermaltake Purepower 500W since it has good reviews on newegg, and comes from a trusted company, and has shown no sign of underperformance on my current rig.

    Thanks for all your help!
  8. No problem mate, for a non SLi setup you don't want anymore than one 12V rail, and until you OC that PSU should be fine buddy.

    Enjoy it!
  9. quick bump... I am ordering tomorrow and wanted last minute suggestions.

    Look above for specs but I have basically narrowed it down to these:

    Corsair 620W HX - I really like the modular cabling.

    Corsair 750W TX - It for $109.99 at newegg right now and seems like a good future proofing PSU.

    PCP&P 610W - Some ppl have said this one is pretty good.

    I've given up on the OCZ GameXStream 700W due to it having 4 rails and not as much approval from the forum users, especially since I don't (and am not going to) have SLI.

    So, last minute suggestions from these PSU? Any help would be appreciated!

    Thanks alot!
  10. [...] orlite.jsp tends to overrate everything and it seems, that it tries to create an upsale. This is far from reality.

    I find this calculator is closer to reality :

    With your computer settings, I think, a 450/500W PSU should be more than enough.
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