Page 2 of 5 FirstFirst 1234 ... LastLast
Results 11 to 20 of 48

Thread: EVGA W1 500W... Oops!

  1. #11
    Join Date
    Oct 2017
    Location
    Grand Junction, CO
    Posts
    3,103
    Thanks Thanks Given 
    227
    Thanks Thanks Received 
    133
    Thanked in
    122 Posts

    Default

    Quote Originally Posted by Jon Gerow View Post
    I can tell you, from experience, that it's not.

    Then what are the specs saying other than heat is more easily lost down the leads than through the case? the leads are metal, the case is plastic.

    Seems to me one must be very careful before announcing "A Major Design Flaw?".
    Attached Images Attached Images
    Last edited by ashiekh; 11-24-2020 at 08:25 PM.

  2. #12
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    17,530
    Thanks Thanks Given 
    582
    Thanks Thanks Received 
    725
    Thanked in
    533 Posts

    Default

    I don't know. Why does an OnSemi TL431 have a wider variance of output voltage depending on operating temperature, compared to the equivalent LiteOn part in the same circuit, despite the part operating well within specified operating temperatures? On paper, the behavior should be the same between the two. But they're not.

    If we could design EVERYTHING based on what a part is supposed to do "on paper" everyone's job would be a lot easier. :-D

  3. #13
    Join Date
    Oct 2017
    Location
    Grand Junction, CO
    Posts
    3,103
    Thanks Thanks Given 
    227
    Thanks Thanks Received 
    133
    Thanked in
    122 Posts

    Default

    I agree, but dumping heat to the circuit board is quite acceptable. If there were room in the design, I'd bend the bridge diode over and bolt it to the board if only to make it more physically robust.

    P.S. hot diodes are more efficient than cold ones ;-) although efficiency is probably not the aim for this power supply.
    Last edited by ashiekh; 11-24-2020 at 09:29 PM.

  4. #14
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    17,530
    Thanks Thanks Given 
    582
    Thanks Thanks Received 
    725
    Thanked in
    533 Posts

    Default

    Quote Originally Posted by ashiekh View Post
    If there were room in the design
    Here's the crux. EVGA has no engineers that know the difference.
    Last edited by Jon Gerow; 11-25-2020 at 03:14 PM.

  5. #15
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    17,530
    Thanks Thanks Given 
    582
    Thanks Thanks Received 
    725
    Thanked in
    533 Posts

    Default

    Quote Originally Posted by ashiekh View Post
    If there were room in the design
    Here's the crux. EVGA has no engineers that know the difference.

  6. #16
    Join Date
    Oct 2017
    Location
    Grand Junction, CO
    Posts
    3,103
    Thanks Thanks Given 
    227
    Thanks Thanks Received 
    133
    Thanked in
    122 Posts

    Default

    So this isn't just a standard platform that EVGA put their name on?
    Attached Images Attached Images
    Last edited by ashiekh; 11-25-2020 at 11:43 AM.

  7. #17
    Join Date
    May 2010
    Location
    Missouri; USA
    Posts
    5,201
    Thanks Thanks Given 
    429
    Thanks Thanks Received 
    51
    Thanked in
    41 Posts

    Default

    It's probably a semi-standard design, but component selection might be the lowest possible on the AVL to meet the price point EVGA wants. Essentially EVGA may have cheaped out on components without knowing the detriment to the design.

  8. #18
    Join Date
    Feb 2020
    Location
    Uzbekistan
    Posts
    411
    Thanks Thanks Given 
    81
    Thanks Thanks Received 
    91
    Thanked in
    83 Posts

    Default

    Quote Originally Posted by Tator Tot View Post
    It's probably a semi-standard design, but component selection might be the lowest possible on the AVL to meet the price point EVGA wants. Essentially EVGA may have cheaped out on components without knowing the detriment to the design.
    Or they've cheaped out knowing that people will still buy their shit just because it has 'EVGA' on it and everyone and their grandma are running around yelling that EVGA's support is out of this world. Even with good support they'll have margins because even through they're selling 200-300W PSU as 500W, you wouldn't find this PSU in a system that really draws 500W on a persistent basis, well ... it's possible but you should be a complete idiot to put this in a such system so hopefully there aren't many such cases.

  9. #19
    Join Date
    May 2010
    Location
    Missouri; USA
    Posts
    5,201
    Thanks Thanks Given 
    429
    Thanks Thanks Received 
    51
    Thanked in
    41 Posts

    Default

    Quote Originally Posted by Juular View Post
    Or they've cheaped out knowing that people will still buy their shit just because it has 'EVGA' on it and everyone and their grandma are running around yelling that EVGA's support is out of this world. Even with good support they'll have margins because even through they're selling 200-300W PSU as 500W, you wouldn't find this PSU in a system that really draws 500W on a persistent basis, well ... it's possible but you should be a complete idiot to put this in a such system so hopefully there aren't many such cases.
    Given the lack of engineers and a bit of background knowledge in how these things go, the conversation most likely went like this:

    EVGA - "We need a 500w unit that can be sold for $xx USD"
    OEM - "We have this, here are our documents on the product, here's where you can trim cost."
    EVGA - "Trim all the costs so we actually make some margin on this."
    OEM - "Okay."

    In the scenario there might be an Engineer at the OEM who really understands what they're selling and it's flaws but he's also most likely not a part of the sales team communicating with EVGA and EVGA doesn't have any Engineers for this product to do in house testing either. They're also not gonna catch any potential problems with a unit like this unless they start seeing massive amounts of returns (either from customers or retailers.)

    It's generally wise to always assume ignorance before malice.

  10. #20
    Join Date
    Jan 2010
    Location
    Greece
    Posts
    1,547
    Thanks Thanks Given 
    194
    Thanks Thanks Received 
    26
    Thanked in
    14 Posts

    Default

    In diodes as the temperature rises the voltage drops on them decrease so less energy gets wasted. That said, you need to be extra sure before you install a diode like this, even in a low to mid-capacity platform. In some other PSUs that the manufacturer wanted to achieve this, they installed two diodes to half the Amperage, bolted together (without a heatsink in between).

    In general, you need to ask for a full thermal analysis in every stage of manufacturing, but such an analysis lasts long (it can run for 40h straight) and you have to trust the manufacturer's results, too. And you pay extra of course unless you ask kindly Moreover, you have to have people able to interpret the results! Because getting a thermal analysis without any knowledge on tolerances etc. is meaningless.

    Since I doubt many of the results provided by factories, I will invest in a high-end Keysight DAQ to conduct them on my own in some selected samples.

  11. The Following 3 Users Say Thank You to crmaris For This Useful Post:

    Juular (11-25-2020), Philipus II (11-25-2020), Polaris20 (4 Weeks Ago)

Posting Permissions

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