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Thread: PSU Quality & Efficiency

  1. #1
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    Default

    This thread will be dedicated solely for PSU Build quality and efficiency test. i incourage every1 to post their

    PSU internal picture. Dosent matter if you own a generic Psu.Contribute as much as you can.

    Just open the cover and take some snapshot with a Good camera.


    Recently i have conducted a efficiency test on Delux 500 watt PSU DLP 50A price 3700Taka. no warranty

    This PSU DOES not come with the case. It's a aftermarket PSU.

    1st i measured AC watt draw from wall socket.

    198 x 1.6 = 316.8 watt drawing from Wall socket. (picture has 1.5 but it was 1.6 most of the time)

    When LCD excluded it becomes 316.8-34=282.8 watt.

    282.8(AC) watt is consumed by following:

    CPU-3.6 prescott OC 105 watt (prime torture test)

    GPU-HD 4850 100 watt (ATI tool) GPU load 95%

    HDD File copy 12.8 watt (acording to specification)

    Ram DDR1 4 stick - this is where i missed to put enuff load lets assume around 20 watt.( 4 stick DDR1 @ 480mhz 2.7V)

    Motherboard= assuming 5 watt.

    So the over all power consumption (in DC Volt) is 105+100+12.8+20+5 watt =242.8


    Efficiency Formula = (DC watt/AC watt) x 100= % efficiency

    (242.8/282.8) x 100 =85.856 % For margin of error and assumption +- 4.3 %

    im quite impressed with the result....

    Gaming power consumption is coming after this weekend( with PSU internal pix) hopefully.

    Stay tuned guyz..
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    Last edited by minitt; August 18th, 2009 at 01:33.

  2. #2
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    Default Re: PSU Quality & Efficiency

    thanku!! when i checked market. it was 4200!! now price reduced. nice.

  3. #3
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    Default Re: PSU Quality & Efficiency

    Superb thread bro...I always wanted threads like this...this thread is going to help millions with their PSU problems
    thanx again minnit bro...it was high time BG needed a thread like this

    everyone post pictures & contribute to the thread & keep the activity of this thread flowing
    I'll post mine when I get home

    btw minnit bhaiya...that looks like an awesome PSU by the conducted tests

  4. #4
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    Default Re: PSU Quality & Efficiency

    Quote Originally Posted by minitt View Post



    198 x 1.6 = 316.8 watt drawing from Wall socket. (picture has 1.5 but it was 1.6 most of the time)
    this is not THE way to calculate AC power. . even if u r using a single phase AC supply. and due to large capacitance of power supply and comparatively lower inductance power factor is not unity.

    U have calculated VA(volt-ampere ) here actually. something like VA and Watts are different in UPS for this reason.

    Quote Originally Posted by minitt View Post

    Efficiency Formula = (DC watt/AC watt) x 100= % efficiency
    better write efficiency formula = Used Power/ Consumed Power
    because technically power is not an ac or dc term. its has only real term and imaginary term.



    But i really appreciate your approach and curiosity.
    Some qoutes that have helped me passing the 'moments' of my life:

    1. Accept your limitations, then go beyond them.
    2. Dont think old man. Sail on this course and take it when it comes
    3. I am who i am, not what i am.
    4. Life is too short to be pissed of all the time.
    5. Theists and atheists think alike while they face the real BAD of life
    6. You can never really know a man unless you walk in his shoes.
    7. Forgive thee, who bring upon hatred on you.

  5. #5
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    Default Re: PSU Quality & Efficiency

    Quote Originally Posted by WoH[AMON]~Lord SMS View Post
    this is not THE way to calculate AC power. . even if u r using a single phase AC supply. and due to large capacitance of power supply and comparatively lower inductance power factor is not unity.

    U have calculated VA(volt-ampere ) here actually. something like VA and Watts are different in UPS for this reason.
    ok where did u find UPS???

    and using clamp meter to measure AMP( thus watt) IS NOT A wrong method. No offense but look around a bit if u wish.

    and if u still insist please by all mean give us a better explanation and method in this regard so that i can apply it. After all we r here to learn.

    Quote Originally Posted by WoH[AMON]~Lord SMS View Post
    better write efficiency formula = Used Power/ Consumed Power
    because technically power is not an ac or dc term. its has only real term and imaginary term.
    bro giving synonyms is ok only if it was complex in the 1st place. The given efficiency formula ((DC watt/AC watt) x 100= % efficiency) has NO

    problem or wut so ever. rather its much easier to understand since its the PSU efficiency we r concerned bout.

    IF i put the formula like u suggested then ppl might be puzzled like which one is used and which one is consumed....lolz wuts the difference betwwen used and consumed!!!!!!

    So We dont need unnecessary Physics 101 here.

    And please try to contribute which will enrich this thread since u possess much higher expertise in this field. Respect to U

    thanx.
    Last edited by minitt; August 18th, 2009 at 21:18.

  6. #6
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    Default Re: PSU Quality & Efficiency

    ok, here is the explanation.

    measuring current is ok. but the problem is switching mode power supplies(which are most common these days) have power factor less than unity. and their is no global standard of specifying power factor of computer power supply.

    Due to harmonics generated bcoz of unused time slices of switching mode power supply, power factor less than unity is a must. unless some large capacitor banks are used. even some times inductor coil is used to.

    say power factor is 0.8.

    then AC power is = current(rms) * voltage(rms)*0.8

    u can not measure power factor by normal multimeter. this power factor is the thing that makes KVA(aparant power) and KW(real power) different.

    if u need i can give more explanation.

    and btw, this is not PHYSICS 101, this is ELECTRICAL ENGINEERING for 4 years and 1 year of practical experience of working with stuffs like this. and i did not look around, i studied these to be a 4th year EEE student.

    ciao

    ---------- Post added at 20:36 ---------- Previous post was at 20:31 ----------

    and UPS was just an analogy. we buy a 1000VA ups to get around 600-700 watt. just that
    Last edited by WoH[AMON]~Lord SMS; August 18th, 2009 at 20:42. Reason: misplaced division sign
    Some qoutes that have helped me passing the 'moments' of my life:

    1. Accept your limitations, then go beyond them.
    2. Dont think old man. Sail on this course and take it when it comes
    3. I am who i am, not what i am.
    4. Life is too short to be pissed of all the time.
    5. Theists and atheists think alike while they face the real BAD of life
    6. You can never really know a man unless you walk in his shoes.
    7. Forgive thee, who bring upon hatred on you.

  7. #7
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    Default Re: PSU Quality & Efficiency

    dats lot to consume..aham

    So do u have any practical usable method to test PSU other than the 1 posted????

  8. #8
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    Default Re: PSU Quality & Efficiency

    well, what u wanted to do is to get how much power the psu is consuming and how much it is delivering to the CPU?

    if that so, i am afraid u need a good oscilloscope or varmeter or wattmeter to do so.

    with any of these u can get the power factor.

    say, current reading out of wall socket is 2. and vlotage reading is 200. so aparant power is 400 VA.

    if u can get the power factor reading (say 0.8)

    then real power drawn by PSU is 400 * 0.8 = 320 watt.

    then again u have to know the exact amount of power drawn by each of the component (ALL WORKING TOGETHER). i do not know how to get that. for an approximation u can sum up the values as u did here. lets assume that the value is 220 watt.

    now the efficiency is (220/320)*100 %

    now where does that that 100 watt goes? it is wasted as heat or charging up devices inside PSU and also in power buses.

    but, i guess what u r really interested about is IF we buy a 500 watt PSU how much power can it give actually. im afraid their is no straight cut answer or method to get it. u need a lot of equipments to precisely measure this and also the reading may vary from PC to PC. for example if u use a 10 watt cooling fan, then u are using some extra power like 10/power factor as fans and stuffs lowers the power factor.

    this is the reason that PSU makers can not give any sure benchmark of their PSU's efficiency. all they say is something like '100%' wattage.
    Some qoutes that have helped me passing the 'moments' of my life:

    1. Accept your limitations, then go beyond them.
    2. Dont think old man. Sail on this course and take it when it comes
    3. I am who i am, not what i am.
    4. Life is too short to be pissed of all the time.
    5. Theists and atheists think alike while they face the real BAD of life
    6. You can never really know a man unless you walk in his shoes.
    7. Forgive thee, who bring upon hatred on you.

  9. #9
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    Default Re: PSU Quality & Efficiency

    Quote Originally Posted by minitt View Post
    This thread will be dedicated solely for PSU Build quality and efficiency test. i incourage every1 to post their

    PSU internal picture. Dosent matter if you own a generic Psu.Contribute as much as you can.

    Just open the cover and take some snapshot with a Good camera.


    Recently i have conducted a efficiency test on Delux 500 watt PSU DLP 50A price 3700Taka. no warranty

    This PSU DOES not come with the case. It's a aftermarket PSU.

    1st i measured AC watt draw from wall socket.

    198 x 1.6 = 316.8 watt drawing from Wall socket. (picture has 1.5 but it was 1.6 most of the time)

    When LCD excluded it becomes 316.8-34=282.8 watt.

    282.8(AC) watt is consumed by following:

    CPU-3.6 prescott OC 105 watt (prime torture test)

    GPU-HD 4850 100 watt (ATI tool) GPU load 95%

    HDD File copy 12.8 watt (acording to specification)

    Ram DDR1 4 stick - this is where i missed to put enuff load lets assume around 20 watt.( 4 stick DDR1 @ 480mhz 2.7V)

    Motherboard= assuming 5 watt.

    So the over all power consumption (in DC Volt) is 105+100+12.8+20+5 watt =242.8


    Efficiency Formula = (DC watt/AC watt) x 100= % efficiency

    (242.8/282.8) x 100 =85.856 % For margin of error and assumption +- 4.3 %

    im quite impressed with the result....

    Gaming power consumption is coming after this weekend( with PSU internal pix) hopefully.

    Stay tuned guyz..
    nice thread minitt
    ur practical effort is helpful & appreciated

    "Game after game after game, I realized what is most important of my life - FOOTBALL.."
    I bleed red, Man Utd 4ever..
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    অনেক দূরের একলা পথে, ক্লান্ত আমি ফিরি তোমার কাছে, মুখোশ খুলে বসে রই জানলার ধারে..

  10. #10
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    Default Re: PSU Quality & Efficiency

    @WoH[AMON]~Lord SMS Guys like you should come up with thread like this.. u r more capable of handling

    these stuff.

    @Everyone
    ill try to keep this thread understandable to all levels of users. For which i request ppl to keep their information as simple as possible so that its consumable to all the users. I hope you guyz got my point.

    It is true that precise PSU test requires quite expensive equipments. Yet we gotta do with whatever we have.

    Measuring PSU efficiency with clamp on amp meter method is not precise but its far better than some wild guess. dats why i mentioned 4.3% as a margin of error.

    @WoH[AMON]~Lord SMS ...bro watch over this thread im expecting comments from u regarding psu build quality caz u have access to wide variety of quality components.

    cheers.

  11. #11
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    Default Re: PSU Quality & Efficiency

    u keep working... as i told u before after my exam im planning to design one. then we will have elaborate talk.
    Some qoutes that have helped me passing the 'moments' of my life:

    1. Accept your limitations, then go beyond them.
    2. Dont think old man. Sail on this course and take it when it comes
    3. I am who i am, not what i am.
    4. Life is too short to be pissed of all the time.
    5. Theists and atheists think alike while they face the real BAD of life
    6. You can never really know a man unless you walk in his shoes.
    7. Forgive thee, who bring upon hatred on you.

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