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Is my power supply sufficient?

I have the Rosewill Stallion Series RD400-2-SB 400W ATX 12V v2.2 Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182074

I want to buy EVGA GeForce GTX 750 Ti FTW
http://www.newegg.com/Product/Product.aspx?Item=N82E16814487028
23 answers Last reply Best Answer
More about power supply sufficient
  1. what cpu do you have?
  2. bit close, despite what EVGA says the recommended minimum is more generally stated as 500w for any 660.
  3. It's very unlikely, but let me make sure. What is your CPU?
  4. Bad_Kitty13 said:
    what cpu do you have?

    I have the Phenom I 9950; I know that it's going to bottleneck but I will upgrade the cpu at a later date.
  5. Just to be on the safe side regardless, I'd pick up one of these. It is a solid PSU built by Seasonic.

    http://pcpartpicker.com/part/xfx-power-supply-p1650snlb9
  6. 660 total power draw is 140w
    mem chipset power draw is no more than 84w
    your cou is 140w

    your psu pushes 324w on 12v rail

    this is a max draw of 364 on a 324w it cannot handle it. even if your mem chipset tdp was around 50w it would still be to high
  7. Bad_Kitty13 said:
    660 total power draw is 140w
    mem chipset power draw is no more than 84w
    your cou is 140w

    your psu pushes 324w on 12v rail

    this is a max draw of 364 on a 324w it cannot handle it. even if your mem chipset tdp was around 50w it would still be to high


    What about EVGA GTX 750 1GB
    http://www.newegg.com/Product/Product.aspx?Item=14-487-027
    Newegg's website says 400 watts and 20 amps. Am I safe with this choice?
  8. Your PSU still isn't very high quality. Go for the xfx PSU I posted before, it will be worth it.
  9. Best answer
    yes those and the 750 ti's only draw 60-65 watt i would go with that or a ti if you can afford it

    a 750 ti's performance is pretty much equal to a 660 anyway
  10. Mephikun said:
    Your PSU still isn't very high quality. Go for the xfx PSU I posted before, it will be worth it.

    I really don't want to spend money on a new power supply though. I bought it around 2009 for probably like 50 bucks or more.
  11. Bad_Kitty13 said:
    yes those and the 750 ti's only draw 60-65 watt i would go with that or a ti if you can afford it

    a 750 ti's performance is pretty much equal to a 660 anyway

    I read that the Ti is only like a 10 percent difference. If the 750 is that close to the 660, I think I will settle for that. Thanks for your help.
  12. D-Saad Malik said:


    That's got to be considered way overkill mang.
    https://www.youtube.com/watch?v=2Z4m4lnjxkY
  13. here are some benchmarks
    http://www.anandtech.com/show/7764/the-nvidia-geforce-gtx-750-ti-and-gtx-750-review-maxwell/13

    i would go with the ti if you have the extra 30ish dollars
  14. Bad_Kitty13 said:
    your psu pushes 324w on 12v rail

    Sorry to bother you, but I have more questions.
    I have the 125 watt version of the 9950.
    How did you come up with 324 watts?
    I came up with like 255....
    I did some more looking around and I think I want to get
    http://www.evga.com/Products/Product.aspx?pn=02G-P4-3757-KR

    Edit: I figured out how you came up with 324 watts, you converted amps to watts.
  15. edit
  16. Bad_Kitty13 said:
    here are some benchmarks
    http://www.anandtech.com/show/7764/the-nvidia-geforce-gtx-750-ti-and-gtx-750-review-maxwell/13

    i would go with the ti if you have the extra 30ish dollars


    Bad_Kitty13 you said "mem chipset power draw is no more than 84w" how do I calculate exactly how much mem chipset power I am using? Are you talking about how much my ram uses?
  17. i got the power draw from your cpu from this
    http://www.newegg.com/Product/Product.aspx?Item=N82E16819103273
    it says its a 140w psu draw but i couldnt find the specs for the "i" version

    the memory and chipset tdp vary depending on motherboard and memory. typically a average board with ddr2 memory is around 45-65w highend with ddr3 is no more than 84w
    http://www.buildcomputers.net/power-consumption-of-pc-components.html
    http://www.tomshardware.com/reviews/geforce-radeon-power,2122-7.html

    at least your board with mem wil draw around 25w most would be around 84w. i always say 84w because it is only a difference of 4-5a and if you are going to be that close to where this is an issue you need a new power supply. unless you have a tier 1 or 2 psu you most likely arent going to get out of the box ratings on the psu anyway and they will degrade over time as well. so you never want to push it close to the thresh hold. usually at max load your system should only draw 75-80% of the 12v rail rating even on a new psu

    that 750 ti draws around 85w instead of 60w. it is also the only one i know of with a 6 pin pcie connector for added power. it shouldnt have a problem running in your setup so long as you have pcie 6 pin cable on your psu
  18. There is no way your power supply can be considered sufficient for a new video card. Your system is already close to the edge; you can only afford to get a low wattage (and slower) video card on that power supply.

    Consider these facts.
    1. Your power supply provides 324W (or 27amps on the +12v rail)
    2. Your CPU + base system draws maybe 270W (or 22amps on +12v rail, worst case)
    3. The GTX 660 needs maybe 130W (10 amps on +12v rail)
    4. Add those numbers together, and you would need at least 400W on the +12v rail... more than that (like 450W) to be safe.

    CPU numbers here:
    http://www.xbitlabs.com/articles/cpu/display/core2quad-q9400_11.html#sect0
    GPU numbers here:
    http://www.techpowerup.com/reviews/MSI/GTX_660_Twin_Frozr_III/25.html

    Note: the CPU power numbers are not entirely accurate, but that's the best review site I have right now. Perhaps the numbers the other posters gave for the CPU and motherboard is more accurate.
  19. For reference:
    GTX 750 OC - 64W (5amps)
    GTX 750 Ti OC - 65W (5amps)
    http://www.techpowerup.com/reviews/ASUS/GTX_750_OC/23.html
    http://www.techpowerup.com/reviews/ASUS/GTX_750_Ti_OC/23.html
    ... or you want to estimate max overclocking power numbers, then *maybe* add up the plugs:
    75W (DC) for the PCI-Express slot
    75W (DC) for each 6-pin power plug
    150W (DC) for each 8-pin power plug

    I will add that my numbers on the CPU may be a little more than they should be. However, I am only going by what the review site says. Unfortunately, there are not any good review sites for CPUs that properly isolate power requirements for CPU and motherboard. Using the TDP for the processor, might work... but I don't have enough experience using that technique to estimate power requirements.

    My CPU numbers also suffer from a second flaw. I just assume all that power is on the +12v rail (most of it is). But in reality, some of it may be on other rails. Again, without good testing (or extra info to help clarify things), I don't really know for sure what the real rail power numbers are.

    However, you can rely on the video card numbers from techpowerup. They way they test it is pretty accurate (unlike almost every other site).
  20. Bad_Kitty13 said:
    it says its a 140w psu draw but i couldnt find the specs for the "i" version


    CURRENT GPU AND POWER SUPPLY:

    HIS Hightech H467QT512P Radeon HD 4670 IceQ Turbo 512MB 128-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...

    Rosewill Stallion Series RD400-2-SB 400W ATX 12V v2.2 Power Supply
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...

    OTHER RELEVANT SYSTEM SPECS: AMD Phenom 9950 Agena 2.6GHz Socket AM2+ 125W Quad-Core Black Edition Processor HD995ZXAGHBOX
    http://www.newegg.com/Product/Product.aspx?Item=N82E16819103291

    BIOSTAR TA790GX XE AM2+/AM3 AMD 790GX HDMI Micro ATX AMD Motherboard
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...

    OCZ SLI-Ready Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2N800SR4GK
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...

    I also use antec 300 case and CM 212 Evo Cpu cooler.

    Will I have enough power to replace the 4670 with this 750ti FTW?
    http://www.newegg.com/Product/Product.aspx?Item=N82E16814487028
    Thanks again for your help bad kitty.
  21. i would go with this one
    http://pcpartpicker.com/part/evga-video-card-02gp43753kr

    unless you were going to overclock it(not recommended) there is no need for the pcie 6 pin connector because that is mainly what the extra pins on this card is for, this evga has .01 less on factory clocks and you wouldnt notice a difference on performance and there is no 6 pin connector. with your setup the 750 ti i listed has around the same power draw as a 4670
    http://www.gpureview.com/radeon-hd-4670-pci-e-card-579.html
  22. Bad_Kitty13 said:
    i would go with this one
    http://pcpartpicker.com/part/evga-video-card-02gp43753kr

    unless you were going to overclock it(not recommended) there is no need for the pcie 6 pin connector because that is mainly what the extra pins on this card is for, this evga has .01 less on factory clocks and you wouldnt notice a difference on performance and there is no 6 pin connector. with your setup the 750 ti i listed has around the same power draw as a 4670
    http://www.gpureview.com/radeon-hd-4670-pci-e-card-579.html

    I was about to post something similar. :)
    Essentially, the old card (HD 4670) goes up to about 65W under load, and doesn't use any extra power plugs. (So the max possible is 70-75W)
    http://ht4u.net/reviews/2009/power_consumption_graphics/index31.php
    So... getting a card that uses the same amount of power and doesn't use any extra power plugs, should work in the system.
    Thus, the 750 Ti will work, but if you can find another model without any extra power plugs, it probably will work too.
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