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What size do I need

Hey guys

I have been doing a lot of research online and I am getting a lot of different numbers. Here is my planned system (brands may vary depending on sales when I order but specs will remain the same)

CM690 ii Advanced Case (with included fans)
Intel 2500k (looking at doing some OC in the future but not right away)
COOLER MASTER Hyper 212 Plus
ASUS P8Z68-V PRO/GEN3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9B
Microsoft Windows 7 Home Premium SP1 64-bit - OEM (or Pro, I haven't made up my mind there yet)
Mushkin Enhanced Chronos MKNSSDCR120GB 2.5" 120GB SATA III MLC Internal Solid State Drive (SSD) (Will be my only HDD until prices come down or until I decide to tear apart my external drives)
ASUS Black Blu-ray Drive SATA Model BC-12B1ST/BLK/B/AS - OEM
EVGA 012-P3-2068-KR GeForce GTX 560 Ti (Fermi) 448 Cores Classified 1280MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI <~ Hopefully will be SLI this in the next few months if I can stick to my budget over the said next two months

So here is the thing, I am looking for a modular PS (or at least half modular) and I have been looking at a lot of sites and I am getting really confusing information:

Neweggs calculator is telling me I need a 765w PS
Extreme Power is telling me I need a 566w PS
Some people are saying in forums that they need a 850w PS for the 560ti's in SLI

I am pulling out my hair here, I really would like to find a PS as I am going to be doing this order in the next few days or even tomorrow maybe who knows, but for right now I have plans on only the one 560ti 448 core but ultimately I will be adding a 2nd, a mechanical 7200rpm HDD (when and if they ever come back down) and possibly 2 more 4gb ram

I was figuring ~850 wats just to be safe, but I don't wanna buy a PS that is really far over my needs because then I will just be wasting money....

So who do I trust, Newegg, Extreme Power or the forums telling everyone 850 watters

Thanks guys (and girls)

8 answers Last reply Best Answer
More about what size need
  1. A quality 750W unit will run that no problem in sli configuration.
    CORSAIR Professional Series HX750 = excellent unit,7 yr warranty = you get what you pay for!
    Mine runs perfectly 2+yrs later.
  2. 750W would be plenty for SLI GTX560Ti's. Get the Corsair TX750 going for $105 on Newegg.
  3. I agree that a quality 750w unit is probably just fine but guru3d recommends 800 watts if you are overclocking. That is to just be on the safe side but they are generally a trustworthy site.

    Quite a few good models in that watt range that are modular. Corsair HX, Seasonic has a few, XFX Pro, Silverstone Strider, Antec HCP ect.
  4. Same site i refer too!
    Note their testbed is an oc'd i7/X58 platform = uses more power then a SB platform.
  5. does it make a difference that I am looking at the 448 core 560s?
  6. Best answer
    drewsuf82 said:
    does it make a difference that I am looking at the 448 core 560s?

    Yep it uses more power then a regular 560ti.
    If your specs included 2 x 560ti a quality 650W would run it.
    That's why a 750W unit is recommended for the 448.
  7. Best answer selected by drewsuf82.
  8. Thanks for all the replies, I cut out a really really over powered PSU
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