1. Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Graphics card bending

Discussion in 'Graphics Cards' started by spixel, Jan 17, 2012.

  1. eidairaman1

    eidairaman1

    Joined:
    Jul 2, 2007
    Messages:
    12,212 (4.68/day)
    Thanks Received:
    1,405
    all cards dip due to weight, but it seems your card is not squared up (perpendicular/ 90 degree angle) with the pci slot in the back of the case, meaning your motherboard is sitting too low on the standoffs. Ive even had to loosen the pci bracket on cards to square them up and even loosen the connector screws so the card would sit right in the pci slot (fully seated in motherboard)
  2. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    Ok cheers, but now there is the question to why the pcb is of such low quality to allow bending? I want to know for future reference is this a problem with ATI, sapphire, or do all current cards use this pcb.
  3. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    For the last time it is not the motherboard or case. My 8800 and 7900 are straight as can be without any adjustments and just holding the cards in my hand and trying to bend them slightly it is impossible to do so with all the cards except the 6870. It is made of weaker PCB which is under strain from the weight.

    But thanks for trying to help, I can see why you might think this is the problem. The card is not slanted from misalignment though, it is bending.
  4. niko084

    niko084

    Joined:
    Dec 5, 2006
    Messages:
    7,636 (2.71/day)
    Thanks Received:
    729
    PCB isn't a stiff material so a lot comes into play, we are not comparing apples to apples here.

    The heatsinks are not the same, back plates if they have them, overall weight and position of voltage regulators, capacitors, ram chips the gpu etc, this all effects the stress against the card and in what place, as we all know from seesaws when the weight is near the other end it pulls with a greater amount of force. It's not particular to any manufacturer.

    Put a OEM intel heatsink with those nice little push pins through a 775 board some time... Then flip it over and see how bad it bulges the board behind the cpu.
    eidairaman1 says thanks.
  5. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    The PCB is different on the cards though, I can see it with my own eyes, it is around half as thick as the pcb used on the 7900 and 8800.
  6. eidairaman1

    eidairaman1

    Joined:
    Jul 2, 2007
    Messages:
    12,212 (4.68/day)
    Thanks Received:
    1,405



    Honestly if you dont like how the card is made just take it back, or make a support bracket
  7. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    I don't mind it that much to return it (yet :D), I didn't make this thread to complain. I am wondering why the pcb is of lower quality, and if it will have any affect on the card over time.
  8. niko084

    niko084

    Joined:
    Dec 5, 2006
    Messages:
    7,636 (2.71/day)
    Thanks Received:
    729
    And it very well maybe, however that would be more related to the requirements of the card. I haven't had my hands on a 7900 in quite some time, however I can tell you the 8800GTX I have sitting in a box is about 2x heavier than my 6870, who knows how many layers are required for the card to be assembled.

    I think you are searching for an answer that simply doesn't exist here. I doubt any of these companies use the same PCB on all their cards, odds are they wont supply you with a test piece for a study on the stiffness of the PCB. We can't compare card to card to card, I can tell you my 6870 has a tiny bit of bend in it.

    What I can assure you of is how common this is and how much of a problem this isn't.
    If it was a big issue you would see it being reported all over with complaints and failures and fixes which you don't see.

    Do yourself a favor and support it if it worries you and just forget about it, frag on! :toast:
    spixel and eidairaman1 say thanks.
  9. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    Thanks, has anyone ever noticed their nvidia card bending though? Do you have a reference or non reference card? Both my 7900 and 8800 are reference. I just want to figure this out somewhat, even if it is harmless.
  10. niko084

    niko084

    Joined:
    Dec 5, 2006
    Messages:
    7,636 (2.71/day)
    Thanks Received:
    729
    My 8800 is reference and it bends a little bit, I just put a GTS450 *reference* in my roommates system that one bends a fair bit, I have a GTX480 *reference* sitting next to me, that's bent, a system a few feet away with a 4850 *reference* that ones bent a bit.

    You know though...

    I have an HD5450 and a 8400GS also in systems around me right now, those don't bend.
    *also don't weigh anything*

    My 6870 is a non reference and it bends a little.
    eidairaman1 says thanks.
  11. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    Thats odd, completely goes against everything I was thinking haha. Do you see a difference in pcb thickness with your 8800 and 6870?
  12. KingPing

    KingPing

    Joined:
    Aug 17, 2009
    Messages:
    820 (0.45/day)
    Thanks Received:
    270
    Location:
    Argentina (South America)

    I don´t know about the PCB stuff if it is too thin or not, my 8800GTS (G80) from MSI, HD4870 (ref model) fom Visiontek, GTX570 Twin Frozr III from MSI, all those don´t bend because the cooler is supported by a shroud (i think that´s the name). On the other hand my Sapphire Toxic HD5850, Sapphire HD5830 Xtreme, XFX 9800GT, EVGA GTS250, are all more or less bend, because the cooler is attached directly to the PCB without any support. In my opinion today coolers are too heavy and the cards are too long, and without any support the cars start to bend.
    eidairaman1 and spixel say thanks.
  13. sno.lcn

    sno.lcn

    Joined:
    Dec 29, 2006
    Messages:
    670 (0.24/day)
    Thanks Received:
    152
    Location:
    Atlanta, GA, USA
    If the card is leaning a little (like in the picture), I wouldn't worry about it. If it's actually bending from bad HSF mounting, it can cause the video card to stop working, but usually only in severe cases. I've had tons of MSI motherboards not work if the CPU cooling was mounted too tightly. At the same time, I've bent the shit out of countless graphics cards mounting LN2 pots with no negative effects whatsoever.
  14. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    My 7900gtx has no support but it doesn't bend. My sapphire 6870 has no support either, the shroud is not attached to the card and it does bend. Thanks for the info.
  15. niko084

    niko084

    Joined:
    Dec 5, 2006
    Messages:
    7,636 (2.71/day)
    Thanks Received:
    729
    If you are talking about a plastic cover that is attached to the PCB on both ends of the card, yes you are exactly correct it makes that shroud a reinforcement.

    This is where the problem comes in, you are pulling straight down from the center of the card with a fair bit of weight.

    Another easy way to understand this is to look up automotive chassis stiffening *cross braces, traction bars, even roll cages* they all work by providing more generally stiff material to the chassis to aide in avoiding distortion do to outside stress *weight, gravity, g-forces etc etc...*
    Last edited: Jan 17, 2012
  16. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    My sapphire 6870 has the plastic cover, but it is not attached to the pcb at either end of the card so as you said, all the weight is on the centre of the card.

    What is confusing me though is my 7900 is not attached either and the cooler is quite heavy but it doesn't bend. 8800 ultra cooler is attached to the card in many places.
  17. KingPing

    KingPing

    Joined:
    Aug 17, 2009
    Messages:
    820 (0.45/day)
    Thanks Received:
    270
    Location:
    Argentina (South America)
    I think the same, those coolers are all attached with only 4 screws to the center of the card, no s*** they all bend. I think all cards should use a Shroud or brace like the one on the picture

    [​IMG]
    eidairaman1 says thanks.
  18. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    [​IMG]

    [​IMG]

    Both of those cards have support, 6870 doesn't. I think the bending is a mixture of no support and the thinner PCB, mostly the PCB though as the lack of support has no affect on my 7900
  19. kenkickr

    kenkickr

    Joined:
    Dec 5, 2007
    Messages:
    4,814 (1.96/day)
    Thanks Received:
    1,442
    About the only thing I know to help your issue is pick up a CardKeeper.
    Crunching for Team TPU
  20. KingPing

    KingPing

    Joined:
    Aug 17, 2009
    Messages:
    820 (0.45/day)
    Thanks Received:
    270
    Location:
    Argentina (South America)

    Now i am confused, i remembered that i have an old FX5500, it´s light and small and it is bend.
    eidairaman1 says thanks.
  21. spixel New Member

    Joined:
    Jul 16, 2007
    Messages:
    299 (0.12/day)
    Thanks Received:
    10
    Maybe there is different causes to the bending, perhaps the fx5500 is bent regardless of weight while other cards that should be straight are bent from weight of cooler and thin pcb with no support.
  22. KingPing

    KingPing

    Joined:
    Aug 17, 2009
    Messages:
    820 (0.45/day)
    Thanks Received:
    270
    Location:
    Argentina (South America)
    Or maybe my dam brother is bending my cards again!!!:laugh:

    Seriously, i have no idea, Maybe heat, weight, thin PCB are bending the cards.
  23. kellottajaFIN

    kellottajaFIN New Member

    Joined:
    Feb 28, 2007
    Messages:
    24 (0.01/day)
    Thanks Received:
    0
    Location:
    Jyväskylä, Finland
    My old HD4850 (with Accelero S1 rev2) was bent quite a lot, but it's still alive. Of course some support is recommended, but at least my gfx cards have survived without any support. :D
  24. niffcreature New Member

    Joined:
    Jul 12, 2011
    Messages:
    5 (0.00/day)
    Thanks Received:
    0
    I get pretty PO'd when my LCDs bend, but hey - haven't we all seen those new samsung LCDs that bend like paper?

    For whatever reason, technology seems to be catering towards making things more flexible. I'm guessing the new thinner PCB is made from much stronger materials.

    What a coincidence - my 15lb cat just stepped on a Radeon 1950 and bent it. :eek:

    @niko84 greetings from st paul! Great 60 minutes of sun we just had for the entire month, eh? :wtf:
  25. Norton

    Norton WCG-TPU Team Captain

    Joined:
    Dec 21, 2011
    Messages:
    8,458 (8.68/day)
    Thanks Received:
    18,927
    Part of your answer lies in basic geometry and physics. These are two different examples of 6870's


    Reference:
    12.jpg


    Non-Reference
    11.jpg

    The Reference board's cooler and shroud form a box and this shape is resistant to bending. In addition, this box is attached to the PCB at mulitple points including 2 additional screws from the shroud to the backplate.... which makes it even more resistant to bending.;)

    The Non-Reference board is only a flat PCB attached to the back plate by only a few screws and the cards outputs. Any weight on this type of placed at a distance from the backplate will increase the stress the PCB at the attachment points and could bend them. :wtf:

    If you take the card out and look at it closely you will likely see that the angle between the backplate and PCB is no longer 90 degrees.

    As others have said, adjusting the Mobo slightly will improve the bend on the card by bring the angle (backplate/PCB) back towards 90 degrees.

    Real world example- what is more resistant to bending a flat steel plate or a box girder?
    Crunching for Team TPU 10 Million points folded for TPU

Currently Active Users Viewing This Thread: 1 (0 members and 1 guest)

Share This Page