AM5 CPU pin experts help | The Archive | Page 1

limpid finch Sep 28, 2025, 4:30 PM

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Qq for you AM5 CPU pin experts. I am pretty sure this pin is missing/problematic and I was wondering if anyone knew which PCIE lane it relates to. I think its PCIE_RXN [27] but I don't know what isn't going to work.

unkempt ingot Sep 28, 2025, 4:32 PM

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If you are lucky, it's a VSS pin. If you are unlucky, it'll be either Memory Channel A or B. If the pin is not contacting other pins, you can try and find out.

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I can't identify the specific pin, since the image resolution is a bit too low for me. Could you take one photo that is straight on, up close to the affected area? I just need to see two borders so I can count it properly.

limpid finch Sep 28, 2025, 4:33 PM

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unkempt ingot Sep 28, 2025, 4:33 PM

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Can't get any closer?

limpid finch Sep 28, 2025, 4:34 PM

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how do you tell which part of the diagram is the lower left side?

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one sec i gotta take another one then

unkempt ingot Sep 28, 2025, 4:34 PM

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I read it wrong lol. I reference this image for the orientation, then read the pin map.

limpid finch Sep 28, 2025, 4:35 PM

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limpid finch Sep 28, 2025, 4:35 PM

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unkempt ingot I read it wrong lol. I reference this image for the orientation, then read the p...

wait but the longer part of the diagram in the CPU is on the right no?

unkempt ingot Sep 28, 2025, 4:36 PM

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The CPU is the B&W diagram, the motherboard pinout is the coloured.

limpid finch Sep 28, 2025, 4:37 PM

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yeah

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is that picture better?

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I think this is PCIE_RXN [27]

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but I don't know which PCIe lane that is assigned to.

unkempt ingot Sep 28, 2025, 4:41 PM

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Those pictures were worse not gonna lie lol

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But it looks like you have a second messed up pin

limpid finch Sep 28, 2025, 4:41 PM

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yeah ther'es another bent pin but I can bend that one back

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I ain't sure I can bend the one that I shows ya back

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that's the one I am most worried about

unkempt ingot Sep 28, 2025, 4:42 PM

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The one in question is a VSS pin.

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You do realize you can just plug in the CPU & find out, right? You don't HAVE to fix it?

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The only caution you need to take is to make sure the bent pins aren't shorting with another pin.

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From there, plug in the CPU like normal, and test the system to see if it functions normally.

limpid finch Sep 28, 2025, 4:44 PM

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I think you are a little off

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cuz the shorter side is on the other side

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oh wait.. no that's why you made the dots no?

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whoops hold on

unkempt ingot Sep 28, 2025, 4:45 PM

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Nope. Note the triangle.

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The B&W diagram is the bottom of the CPU.

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~~And so is the coloured one, as it turns out~~

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Oh no, that one is backwards, due to the notches at the top and bottom. Got it backwards

limpid finch Sep 28, 2025, 4:47 PM

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unkempt ingot Sep 28, 2025, 4:47 PM

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VDD_MISC pin

limpid finch Sep 28, 2025, 4:47 PM

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oo maybe i am lucky then

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what does the VSS pins do? i thought they were for voltages or something?

unkempt ingot Sep 28, 2025, 4:49 PM

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VSS = Voltage Source Supply. A lot of them are redundancies. VSS is typically a ground pin, while the VSS_MISC is quite important. I do not think you can risk any of them going bad—can be PCIe, DMI, other circuits, so on...

limpid finch Sep 28, 2025, 4:49 PM

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thanks for showing me that the triangel really helps

unkempt ingot Sep 28, 2025, 4:50 PM

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They're both ground pins, but I think the MISC is just basically an isolate ground from the rest. Hopefully, you can sacrifice that one.

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Also, I will re-iterate once more—DO NOT try to fix any of the pins, until you have actually tested a CPU in it.

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Only make sure a pin is not shorting with another.

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You risk more damage fixing a pin.

limpid finch Sep 28, 2025, 5:02 PM

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are you sure it's not the one above that one?

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unkempt ingot Sep 28, 2025, 5:06 PM

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Maybe. I can hardly count from the low res

limpid finch Sep 28, 2025, 5:07 PM

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i wish i could send higher res.. but ther'es a size limit on discord

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so you know what that PCIE_RXN 27 pin does?

unkempt ingot Sep 28, 2025, 5:08 PM

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You can take one and count yourself now at least! :D

unkempt ingot Sep 28, 2025, 5:08 PM

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limpid finch so you know what that PCIE_RXN 27 pin does?

Yeah, it's a PCIe pin

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That's really all I know. I won't know which PCIe slot it would go to.

limpid finch Sep 28, 2025, 5:08 PM

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yeah but my terrible question is.. which one is it LOL cuz I can't tell

unkempt ingot Sep 28, 2025, 5:08 PM

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This is where you have to TEST THE SYSTEM AND FIND OUT

limpid finch Sep 28, 2025, 5:09 PM

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yeah but gpus are very expensive

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and so yeah it'd be nice to just throw it in.. but I don't wanna risk something expensive if I can figure it out beforehand.

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or it could be a storage drive...

unkempt ingot Sep 28, 2025, 5:09 PM

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You don't have any GPU at all?

unkempt ingot Sep 28, 2025, 5:09 PM

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limpid finch and so yeah it'd be nice to just throw it in.. but I don't wanna risk something ...

You can't fry anything from a missing/bent pin.

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Again, you only have to make sure it's not TOUCHING another pin.

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I would just go ahead and put the system together as a test bench, and find out if it works.

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If it does, slam it into a case and worry no more

limpid finch Sep 28, 2025, 5:11 PM

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ok thanks

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tis gonna be funnnnn

#AM5 CPU pin experts help