need a suggestion with my psu...

ive got a lot of mods going into my computer and im not sure if the psu i have will continue to be stable...

future setup
2x 120 mm fans
2x 80 mm fans
1 160gb harddrive
1 PNY 7800gs agp
1 creative x-fi soundcard
2x 14' cold cathode lights
fan speed controller (duno if that uses extra power or not... prob not)
amd64 clawhammer socket 754 3700+

im beginning to wonder how much my whimpy 400watt thermaltake psu can handle, its the psu that came with my tsunami dream case... so far its been VERY stable, even after overclocking my video card over 200mhz (i forget stock vs. oc, its prob in my sig).

so ur prob wondering what the question is, its do u think that my 400watt psu will be able to power all this stuff stabley? the psu is about a year and half old. its been stable like a rock but i feel that the age/amount of upgrades im putting in will cause it to get unstable.

things im adding are:
2x 80 mm fans
2x 14' cold cathode lights
fan speed controller

also whats that website that calculates the power needed? thx for all the help, and yea i know, long post...
13 answers Last reply
More about need suggestion

    You can load it up & see how it goes.

    The second rig in my sig with the X850XTPE has a 420w Thermaltake PSU.
  2. well it said 316 watts... but i duno how to find out a few things..
    1. theres no option for when the video card is overclocked? that adds power doesn it?
    2. whats surge compensation and how do i find out what the % is
    3. whats capiaticor aging mean and how do i find out what % iti s..

    other than that i think the psu will be good enough to last another 6 months till i get unlazy and get an antec modular psu
  3. I don't see it should be a problem either.

    1. Just add the next model up (GT) to act like an OC.
    2. Don't know.
    3. Caps loose some of there power (weaken) over time. I wouldn't worry about this.

    If things start to feel unstable or holding back then turn the lights & maybe the fan controller off.

    The Thermaltakes are a solid little unit, I've put mine through it's paces over time, this is its' second home and it powered a rig with a few things before.
  4. well find out how stable it is with the lights cause im getting them tonight, i feel that there wont be a problem... the extra fans is what im sortof concerned about, im cutting a side window into my case and theres 2 120mm fans that go with it... w00t here comes some nice airflow
  5. nice link, I got some crazy results, current system is in my sig and with fans , usb devices etc.. It says 503 watts at 100% cpu utilization. Then I changed my video cards to 7900GTX superclocked and my usage drops to 488 total 100% util. Just thought this was interesting thanks for the linkage!
  6. Surge Compensation: Surge current during start up compensation. Recommended to add an additional 15-25% if you are not sure about you PSU peak load reliability.

    Capacitor Aging: Electrolytic capacitor aging. When used over extended period of time (1+ years) as well as 24/7 PSU will start loosing its initial wattage. Recommended to add an additional 20% if you plan to keep your PSU for 1+ years (25-30% for 24/7 and 1+ years).

    These are at the bottom of the page.

    I played around with these settings, went from about 440w to 695w max on my system with the X800Pro.
    312w to 483w max for the system with the X850XTPE.

    BTW, how'd you go, no problems.
  7. The 7900's uses less power being built on a the smaller transistor technology.

    Load it up with the surge compensation & cap aging for some really crazy results.
  8. 100% PSU Utilization... is my next question, i dun get what that means, should i have it lower? i have the cpu utilization at 100% too... its like 416 watts with the PSU Utilization at 100%... and my psu is only 400 watts...
  9. I built this PC:

    Lian Li PC-60plus Black Aluminum Case (w/TR-3B Black Thermometer/Fan Controller 3.5” bay)
    Opteron 175 (2x 2.42 GHz, 2MB cache, Socket 939, .09 micron, E6 stepping, OSA175DAA6CD)
    ThermalTake BigWaterSE 12cm liquid cooling system complete kit
    Asus A8R-MVP Motherboard (ATI Radeon Xpress 200 CrossFire, socket 939, SATA2)
    HiS X1800XT Graphics Card (625 MHz/700 MHz OC core/1500 Mhz/1600 MHz OC mem, Dual DL-DVI VIVO 512 MB PCIe)
    ATI TV Theater 550 PRO Tuner (PCI TV and FM Tuner)
    4x 512MB Corsair Micro Xpert DDR RAM (2-3-3-8-2T (spd 2-2-2-5-1T) TwinXP 1024-3200XL)
    2x 74gig Western Digital Raptor Hard Drives RAID-0 (WD740GD RAID0 150gig Boot Drive)
    2x 250gig Western Digital Caviar SE16 Hard Drives (WD2500KS storage and data)
    Plextor 716AL Black 16x DVD/CD Burner (IDE slot loading type)
    Antec TP-II 430 Power Supply (430 Watt ATX12V v2.0 PSU)
    Dell 2405FPW 24-inch LCD Monitor (UltraSharp Wide Aspect Flat Panel Display)
    Logitech G-15 Gaming Keyboard
    Logitech Cordless Optical TrackMan
    Case Fans (SilenX 120mm intake, Adda 120mm exhaust blower, SilenX 92mm exhaust and SilenX 80mm Fan)

    and monitored the power draw from wall outlet.

    Measurements and Analysis of Power Draw consumed from this Opteron PC using Kill-a-Watt meter.
    Based on a brief quick test, and several follow-ups, I preclude that my AMD Opteron rig when over-clocked at 2420MHz from 2200MHz consumes:
    ≤ 200 Watts at Idle
    ≤ 250 Watts during Boot Up
    ≤ 350 Watts at maximum load when benchmarking using 3DMark06 (at 75% efficiency, my PC is requiring ≈ 265 watts of true power from my power supply)
    Note: This is only the PC measured at outlet from the Power Supply; my LCD Monitor was not measured per these results.

    I have since upgraded the PSU to a Antec 550watt TruePowerII and a A8R32-MVP motherboard, still no power problems.
    The Antec 430 watt PSU is going on 4 years old and still works fine.
  10. well i guess the only way to know is to test it out, i should be doing that tonight if my friend feels like actually selling me the rest of my stuff...
  11. Quote:

    You can load it up & see how it goes.


    Thanks for posting this. it looks like i need at leasta 700w psu
  12. Quote:
    100% PSU Utilization... is my next question, i dun get what that means, should i have it lower? i have the cpu utilization at 100% too... its like 416 watts with the PSU Utilization at 100%... and my psu is only 400 watts...

    This would be everything in your system using max power at the same time, which would be CD & hard drives, CPU, graphics ect. hitting in all at once, very rare if ever, and only when doing a bunch of things at the same time.

    I wouldn't worry about it to much, your system should be fine with the 400w TT PSU for what you have.
  13. yea ive begun to think that i was worrying for nothing, 2 fans and 2 cold cathodes is only an extra 10-20 watts at most... ill post back when i get it all tho if it crashes :P
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