Please report all spam threads, posts and suspicious members. We receive spam notifications and will take immediate action!
Page 2 of 2 FirstFirst 12
Results 11 to 14 of 14

Thread: Which PSU should I get?




  1. #11
    Join Date
    Dec 2014
    Location
    sydney
    Posts
    25

    Default Re: Which PSU should I get?

    Since the EVGA SuperNova G2 is really the best bang for the buck, if I were to use the 850W for the single card setup,
    would this be recommended? Or would too much resource be wasted?

    Sorry I'm really lost again after reading some information from different sites. I don't know if I'm understanding this correctly,
    but isn't using a PSU with too much Wattage than required not recommended as well?

    Here's the quote:

    "Power supplies are also most efficient when between like 50% to 80% usuage. Buying one too big might mean that your usuage won't put you in that most efficient range of the unit"

    "but it will waste more power at lower loads because the efficiency will be lower the more wattage extra you got. So you start by spending money you dont need and you then keep wating money on your power bill because of the lower efficiency you get from having too much wattage."

    So does it mean I would be under the efficiency range even though I'm at full load?

    Would you recommend to wait 3 weeks for the 750W one or buy the 850W one now? Since it looks like spending more money
    is actually detrimental in this case if I understand correctly...

  2. #12
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
    Join Date
    Dec 2008
    Location
    Tacoma, WA. [USA]
    Posts
    7,811

    Default Re: Which PSU should I get?

    This graph shows the 750 watt G2's power supply's efficiency vs wattage output:



    Optimal efficiency is from just above 200 watts to 600 watts.

    This chart shows the 850's efficiency at 20%, 40%, 60%, 80% and 100% oads with 120 volt input.
    Efficiency with 230 volt A.C. input is about 2% better.

    Which PSU should I get?-evga-g2-850w-hot-load-test-results-png

    I recommended the EVGA G2 power supplies because their performance is virtually identical to other top tier models and no-one else comes close to the EVGA prices.

    EVGA has outstanding ripple suppression but the Seasonic X models usually have better voltage regulation.
    The bottom line is both of these brands are easily in the EXCELLENT category.
    note: The Seasonic G-750 gold rated psu is a less expensive mainstream psu.

    The newest Nvidia 980 and 970 video cards are much more efficient than the older R9 290(X) video cards.

    Looking at the HardOCP R9 290 wattage table, it looks like adding a second overclocked R9 290 video card would require about 300 watts of additional power from the power supply and 300 + 396 = 696 watts of power from the psu when running demanding games. In this case you would better off with an 850 watt psu.

    Your understanding is correct but the difference in efficiency is only when your system demands less than 20% of the rated psu power.

    The major point to consider is how much power will your overclocked cpu and video card require when you are playing your most demanding games.
    The 750 watt G2 is fine with a single high-end video card but it might be overstressed with a CrossFireX R9 290 dual card setup.

    **edit**
    My SeaSonic SS-660XP2 660W 80Plus Platinum PSU easily powers my GTX 460 SLI setup but this is comparing apples and oranges with my older system and much less powerful video cards.
    Last edited by profJim; 12-30-2014 at 10:36 PM.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  3. #13
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
    Join Date
    Dec 2008
    Location
    Tacoma, WA. [USA]
    Posts
    7,811

    Default Re: Which PSU should I get?

    Check out R9 290 crossfire total system power consumption - AX860i results at different overclock speeds (Water Cooled) - Graphics Cards - Linus Tech Tips where the OP posts several wattage load charts with different video card overclocks.

    It looks like the OP has a dual monitor setup with 1440 and 1080 resolution.

    Here's is his most demanding test:

    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  4. #14
    Join Date
    Nov 2014
    Location
    near Seattle
    Posts
    19

    Default Re: Which PSU should I get?

    Quote Originally Posted by profJim View Post
    HARDOCP - Why 80Plus is Irrelevant to You When Buying a PSU is a good read that discusses premium psu prices and higher efficiency. Even if you could save 5 cents per day compared with a gold rated psu, that would amount to a savings of $18.25 per year with a platinum rated psu. The Antec EA-750 Platinum model is about the same price but psu reviews point out that the EA-750's performance and component selection is inferior.
    HARDOCP is completely missing the point.

    Let's say your high-efficiency PSU only saves you 1KWH/day, a.k.a 9 cents. According to HARDOCP, that's irrelevant.

    According to EIA, 1KWH of electricity is produced by burning 1.11 pound of coal (40-ish% of the world's electricity comes from coal). So you're saving 1.11 pounds/day.

    Here's why HARDOCP is wrong, and high-efficiency PSUs make a difference.

    What happens if a million people put a high-efficiency PSU in their next machine? Sure, each one of them is saving less than a dime a day. But in the aggregate, they are saving (i.e. not burning) 1.11 million pounds of coal every day. And not producing 150,000 pounds of coal ash per day. You might have seen or read about coal ash in the news recently.

Page 2 of 2 FirstFirst 12

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •