Question What's this strange black stuff on gpu backside?

[zaozabot]

I've bought used gpu, owner said this strange goo was applied in hardware service where he bought his pc. Gpu seems to work ok

 

[COLGeek]

Evidence of a significantly over-heated processor on the GPU itself. Does that thing even work? What does the back of the fan/cooler/heatsink look like?

 

[zaozabot]

Evidence of a significantly over-heated processor on the GPU itself. Does that thing even work?

It doesn't seem to have come from within gpu. i managed to clean some of that stuff off with brute force, everything underneeth is fine. As i said, card works fine, had no issues in it even with stress testing, and temps didn't get higher than 80 degrees C

 

[COLGeek]

It doesn't seem to have come from within gpu. i managed to clean some of that stuff off with brute force, everything underneeth is fine. As i said, card works fine, had no issues in it even with stress testing, and temps didn't get higher than 80 degrees C

What does the back of the fan/cooler/heatsink look like?

Is this the same GPU as in your other thread?

 

[zaozabot]

What does the back of the fan/cooler/heatsink look like?

Is this the same GPU as in your other thread?

back of the heatsink looks ok, just some thermal grease leftovers stuck in brushed aluminum. here's a pic.

and this is how chip area looks like

 

[COLGeek]

That GPU certainly got VERY hot at some point. The heatsink seems to be of very low quality.

 

[zaozabot]

That GPU certainly got VERY hot at some point. The heatsink seems to be of very low quality.

well i still don't get where all the melted stuff came from if everything underneath it is intact

 

[Darkbreeze]

"Intact" doesn't necessarily mean "undamaged". It's not like the PCB, resistors, capacitors or diodes are just going to melt. They will fail internally, or discolor, or simply die of fatigue, and there may or may not be any external signs other than potentially discoloring, which by the way is clearly what you see on the top of the GPU itself. That card has been SEVERELY overheated and while it may "work" as you say, there can be very little doubt that that card is seriously done haddit.

 

[USAFRet]

"It will work forevar and evar!"
"It will fail tomorrow"
"I'm surprised it works now"

Which answer would you like to hear?

 

[COLGeek]

well i still don't get where all the melted stuff came from if everything underneath it is intact

Nor do I (get it). Something was applied to the backside of the processor and it was subjected to a very high temperature. I would not rely upon this GPU for anything.

 

[popatim]

Old School Wrinkle paint maybe to help dissipate the heat?

 

[Darkbreeze]

My guess would be that it was some kind of conformal or other coating to help protect the PCB against moisture or other contaminants.