Re: [coreboot] [off topic] Opteron CPU missing chips on the bottom
Hi Taiidan,
I purchased a used g34 opteron off of fleabay (sold as working with no mention of this) and I noticed that it is missing some of the bits on the bottom and that most of them are crooked, I haven't tried it in my system yet and I am wondering should return it? or if there isn't any much risk of it damaging my (expensive kgpe-d16) motherboard and I should see if it works? I got it for half the usual price....guess I should have asked for photos.
I noticed many CPU's sold on ebay have this issue (in those cases they mentioned it) but I can't understand how it happens, for instance I noticed a 6386 for sale where they mentioned that it was missing a few and because of that it doesn't work in a dual socket configuration.
I have a few Opterons which have this issue and it seems to pretty common. I assume that some "expert" put the CPU on a table before mounting it, and they move it one the table - can't imaging how people manage to chop off the chips otherwise. While some of these damaged CPUs seem to work just fine, I had several which do not recognize more than 1-2 pcs of memory and, thus, would not recommend buying one of these. Cheers, Daniel
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Since you've mentioned the remaining lands are also misaligned, I'd throw that CPU away. You currently risk burning out the multiphase regulator and/or attached peripherals (RAM, PCIe), depending on if the lands are now misaligned enough to put voltages where they don't belong. Those lands are very robust; the only way I can think of to chip off one or two would be putting the CPU land-side up and dropping something on it. For more extensive damage, it's possible the CPU was repeatedly overheated at some point in the past as well. On 01/31/2018 12:57 PM, Daniel Kulesz via coreboot wrote:
Hi Taiidan,
I purchased a used g34 opteron off of fleabay (sold as working with no mention of this) and I noticed that it is missing some of the bits on the bottom and that most of them are crooked, I haven't tried it in my system yet and I am wondering should return it? or if there isn't any much risk of it damaging my (expensive kgpe-d16) motherboard and I should see if it works? I got it for half the usual price....guess I should have asked for photos.
I noticed many CPU's sold on ebay have this issue (in those cases they mentioned it) but I can't understand how it happens, for instance I noticed a 6386 for sale where they mentioned that it was missing a few and because of that it doesn't work in a dual socket configuration.
I have a few Opterons which have this issue and it seems to pretty common. I assume that some "expert" put the CPU on a table before mounting it, and they move it one the table - can't imaging how people manage to chop off the chips otherwise. While some of these damaged CPUs seem to work just fine, I had several which do not recognize more than 1-2 pcs of memory and, thus, would not recommend buying one of these.
Cheers, Daniel
- -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 (direct line) +1 (512) 690-0200 (switchboard) https://www.raptorengineering.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJachYhAAoJEK+E3vEXDOFbJ1cH/0LBc4ZCkmeTuwW2HdXvI68r wb13u13IIrWr9KLSt0dRr6y2KC2M7eLwgOXeDgQAUgix+q5NaFh1Ff3usvSQAbOo sH8t4vKQ6y+48uD8phhgunO6Oht4pK1g2iCFmePuStoi8jy/TGco8OibRWUpN+gZ zeloVWRTr1Sbfw5N+cPvLa7qX86IdaOmVB460LtfWEd+IcBzKWYU7f9OpEU2uT/2 vA/Q7pJ4ZyZaz5Qz1n5cAgs8kymqRwY1Wel8z2QrKRQwPW2FecnFQjiDPKYDev6O VZe38GcxGKDcBSHyeADRVwg4Hb1L0WO6yMXNknPgbyzcGifKG+1RJaOWrzKOpJs= =Lu3P -----END PGP SIGNATURE-----
On 01/31/2018 02:16 PM, Timothy Pearson wrote:
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Since you've mentioned the remaining lands are also misaligned, I'd throw that CPU away. You currently risk burning out the multiphase regulator and/or attached peripherals (RAM, PCIe), depending on if the lands are now misaligned enough to put voltages where they don't belong.
Those lands are very robust; the only way I can think of to chip off one or two would be putting the CPU land-side up and dropping something on it. For more extensive damage, it's possible the CPU was repeatedly overheated at some point in the past as well. The expert has spoken! Thanks for the advice all.
I will add a section to the wiki about insisting on a bottom photo for used G34 CPU's.
Hi, Taiidan@gmx.com:
On 01/31/2018 02:16 PM, Timothy Pearson wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
Since you've mentioned the remaining lands are also misaligned, I'd throw that CPU away. You currently risk burning out the multiphase regulator and/or attached peripherals (RAM, PCIe), depending on if the lands are now misaligned enough to put voltages where they don't belong.
Those lands are very robust; the only way I can think of to chip off one or two would be putting the CPU land-side up and dropping something on it. For more extensive damage, it's possible the CPU was repeatedly overheated at some point in the past as well. The expert has spoken! Thanks for the advice all.
I will add a section to the wiki about insisting on a bottom photo for used G34 CPU's.
Should be noted a number of the 62xx series CPUs appear to have two capacitors missing, and I've never seen one without these missing - e.g. https://www.ebay.co.uk/itm/AMD-Opteron-OS6344WKTCGHK-12-Core-Server-CPU-2-6G... Not sure what to think in this case, given the rest of the capacitors appear entirely intact.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 02/20/2018 11:50 AM, Duncan wrote:
Hi,
Taiidan@gmx.com:
On 01/31/2018 02:16 PM, Timothy Pearson wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
Since you've mentioned the remaining lands are also misaligned, I'd throw that CPU away. You currently risk burning out the multiphase regulator and/or attached peripherals (RAM, PCIe), depending on if the lands are now misaligned enough to put voltages where they don't belong.
Those lands are very robust; the only way I can think of to chip off one or two would be putting the CPU land-side up and dropping something on it. For more extensive damage, it's possible the CPU was repeatedly overheated at some point in the past as well. The expert has spoken! Thanks for the advice all.
I will add a section to the wiki about insisting on a bottom photo for used G34 CPU's.
Should be noted a number of the 62xx series CPUs appear to have two capacitors missing, and I've never seen one without these missing - e.g. https://www.ebay.co.uk/itm/AMD-Opteron-OS6344WKTCGHK-12-Core-Server-CPU-2-6G...
Not sure what to think in this case, given the rest of the capacitors appear entirely intact.
You are correct in that the capacitors on the bottom of the package may be partially populated from the factory. Looking for missing capacitors alone is insufficient to determine if damage has been done; high resolution photographs of the bottom of the chip are required to see if pins are chipped off, corroded, if a populated capacitor has broken off (look for any damage to the pads), etc. - -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 (direct line) +1 (512) 690-0200 (switchboard) https://www.raptorengineering.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJajHYQAAoJEK+E3vEXDOFbx7IH/ixbfqwCa7n59lDSHn8ArHBG +v/MptvWaRoRrAgf6j+xVVyJRrZUli0lkXgTtc4gvD0u8VwFRX6AlLDePdVc1LiT Eg5wX3YlGTwb6f1BsP3b6oszA8DEznIVAEko/0f0lTvH2reLa64iL7ibaVjGrBan qSd1yscW47zX3eVGvBrE3AjEuuE+AjbalZ0JD8wf1OgKFH8B1/4w+uPr1DKOK5da lb51zxaRC3udoHXJIDEfA0ww+zgbq4lTgH9f6tx14fvXZO5218PUKvOpjkyhmZkj JQE0sTc+TeSaEvHCUVKQUg5vNErRlChthjYvwcQDRQ1FfVmffACuJz1/wjvotgw= =Z38t -----END PGP SIGNATURE-----
On 02/20/2018 12:50 PM, Duncan wrote:
Should be noted a number of the 62xx series CPUs appear to have two capacitors missing, and I've never seen one without these missing - e.g. https://www.ebay.co.uk/itm/AMD-Opteron-OS6344WKTCGHK-12-Core-Server-CPU-2-6G...
Not sure what to think in this case, given the rest of the capacitors appear entirely intact.
How to tell: Non-populated pads will have the telltale bright shiny copper contacts, whereas the damaged/missing ones will be tarnished and partially obscured (by little plastic bits of the chip that got ripped off) etc. Like tim said, you should ask for high res photos.
participants (4)
-
Daniel Kulesz -
Duncan -
Taiidan＠gmx.com -
Timothy Pearson