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Graphics 22/23 GPU Thread - RTX4000 AND RX7000 Series

Discussion in 'Hardware' started by The_Crapman, 19 Sep 2022.

  1. fix-the-spade

    fix-the-spade Multimodder

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    The insanity of a GPU connector that cannot be bent. If this had been in any way planned you'd think the connector would be 90 degrees down by default, since seemingly every GPU ever put the connector on the side near the end of the card.
     
  2. RedFlames

    RedFlames ...is not a Belgian football team

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    Assuming the 4090 fits in the case in the first place...


    I wonder if they'll use the same coolers on the 7900/7950 or if AMD and AIBs will use 'actually fits in your case*' as a selling point.

    maybe that's why it was at the jaunty angle it was on the 30-series
     
  3. Byron C

    Byron C Ripping a line of speed off a sh**-encrusted bog

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    This... seems like an incredibly dumb design, having that little margin for error is just asking for trouble.

    Take, for example lipo battery connectors for RC. XT60 connectors are pretty common and they're rated for 60 amps, there are also XT90 connectors rated for 90 amps. Typical pack voltages are anything from ~7v to ~22v (1S to 6S). 12v @ 90A is well in excess of what any GPU is going to draw - a single pair of fat cables and one XT90 connector could more than handle the load of a modern GPU and you wouldn't even have to worry about bend radius. Hell, you could even double them up if you wanted to be extra safe.

    Baffling, absolutely baffling, that such a dumb connector design would become part of the PCIe standards. Aren't they also only rated for a really low number of insertions?
     
  4. RedFlames

    RedFlames ...is not a Belgian football team

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  5. The_Crapman

    The_Crapman World's worst stuntman. Lover of bit-tech

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    It's not the connector that's the problem, it's the 4x8pin to 12vhpwr adapter. An adapter that is provided by Nvidia to all the board partners:
    https://www.igorslab.de/en/adapter-...hot-12vhpwr-adapter-with-built-in-breakpoint/
    [​IMG]

    [​IMG]

    The three 12V cables for each 8pin connect to a single 14awg cable, these are soldered onto a 0.2mm copper plate behind the 12pin connector. The 2 wires at the end only connect to 1 crimp, the middle to are connected to 2 crimps. BUT, just in case something happens to either of the outer cables, like they break off from bending or get so hot as to melt the solder and come off, the crimps inside the connector are also connected to each other through little wings inside the connector. This is not present in the proper cables that come on ATX 3.0 / pcie5 specc'd power supplies and their cables (at least for now) remain unaffected by these issues.

    TLDR; The insides of the adapter is an absolute shitshow and Nvidia and their supplier are wholly to blame. If you by a 40series, also buy a new PSU with the proper 12VHPWR cables.
     
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  6. MLyons

    MLyons 70% Dev, 30% Doge. DevDoge Lover of bit-tech Administrator Super Moderator Moderator

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    THIS IS MY OPINION AS MYSELF AND NOT ON BEHALF OF CORSAIR
    I'm sure it's fine. The internet told me last week that jensen is in fact a PSU god and corsair don't know how to make a PSU or cable. Funny how that works.
     
    The_Crapman likes this.
  7. Anfield

    Anfield Multimodder

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    Kinda makes me think the shortage of 4090s is due to AIBs having hit the big red stop button on advice of their lawyers until Nvidia gives them an adapter that doesn't want to murder your loved ones in a house fire...
     
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  8. IanW

    IanW Grumpy Old Git

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    Nvidia's 4090 store page is currently "Access Denied" - Possible FE drop in a few mins?

    EDIT - Still "Access Denied" - Now think it's being DDOS'd by scalper bots.
     
    Last edited: 27 Oct 2022
  9. IanW

    IanW Grumpy Old Git

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  10. David

    David μoʍ ɼouმ qᴉq λon ƨbԍuq ϝʁλᴉuმ ϝo ʁԍɑq ϝμᴉƨ

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    Can't imagine anyone queuing up to buy a 40 series right now, given the fun and games with melting power adapters and stories of less than ideal RMA experiences.
     
  11. IanW

    IanW Grumpy Old Git

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    True. Then there's AMD's RDNA3 launch next Thursday, with slightly less flamey power connectors.
     
  12. Yaka

    Yaka Multimodder

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    nvidia really dropped the ball on this one.

    has anyone split open a cablemods cable yet?
     
  13. The_Crapman

    The_Crapman World's worst stuntman. Lover of bit-tech

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  14. David

    David μoʍ ɼouმ qᴉq λon ƨbԍuq ϝʁλᴉuმ ϝo ʁԍɑq ϝμᴉƨ

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    The likes of Corsair and Cablemods use single piece female pins in their adapters, but you can see the two piece pins in the end of the nvidia adapter - any excessive bending (esp. laterally) is going to force those two piece pins apart a little, loosening the contact and reducing the physical connection. That seems like an obvious way to increase the resistance (impedance perhaps is a better word?) and create heat build up.
     
    Last edited: 30 Oct 2022
  15. The_Crapman

    The_Crapman World's worst stuntman. Lover of bit-tech

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    Pretty sure having all the pins connected across each other in the way they are is outside the PCI spec, and molex's spec too. Don't know why they thought it would be ok. Especially after reports of melting and burning.
     
  16. David

    David μoʍ ɼouმ qᴉq λon ƨbԍuq ϝʁλᴉuმ ϝo ʁԍɑq ϝμᴉƨ

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    See, that's another thing that has always bothered me, even on the old PCIE connectors - you have two rows of pins: one row is 12v and the other is ground. Why didn't they just develop a heavier duty two pin spade connector type deal decades ago?
     
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  17. The_Crapman

    The_Crapman World's worst stuntman. Lover of bit-tech

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    Oh it could definitely be done with just 2 pins. The funny thing is that the spec from molex for minifit jnr terminals allows for up to 150w (13A) on a single terminal, or 108W (9A) each if using 2 or 3. But, you'd have to ensure the correct spec of wire is used and then beefed up PCB traces around the power terminal, maybe additional power circuitry at the power plug. Using more pins and less current on each one is just more cost efficient and allows for users who cheap out on their PSU.
     
  18. Arboreal

    Arboreal Keeper of the Electric Currants

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    I still don't understand why 8 pin PCIe has 3x 13v and 5x ground, not 4 of each...
     
  19. RedFlames

    RedFlames ...is not a Belgian football team

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  20. sandys

    sandys Multimodder

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    Can't really comment on the adapter but in our designs we'll use lots of grounds for quiet shielding etc, so perhaps it's a shield line.

    Always want good grounds.
     
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