A general word of caution about socket 3647 Xeons out of California, especially the silicon valley area... I bought two 8259CL recently:
1) From ebay seller
central_valley_computer_parts_inc, who misrepresented the CPU as a "clean pull", picture of CPU in ad also not same that was sent, obviously. CPU came badly dinged 45 deg on one corner. Currently waiting for refund from ebay. ebay said 2-3 days and its now 4 weeks.
2) From
echo -n "X" | sha256sum = 500353e9eeae2fa68c49801e30a3b9a48390f8f51194a3a50521dc2d15e9be2a (will elaborate once I have the money back), who sent a dinged and bent-back into shape CPU, even though I explicitly stated that they should not go through with the deal if the CPU they are sending had been damaged previously. Currently en-route back to USA, for a refund. Of course I got charged 120 import tax since this was a USA to EU transaction, which I now have to try and recoup. 50 more EUR are gone forever, for sending it back and Fedex handling fee.
Can you tell I am miffed? Wait for it...
While CPU #1 would not even fit into its plastic carrier any longer, CPU #2 seemed fine at first. So I put into the board 6x32 GB of RAM and Passmark Memtest reported no errors. Then I ran stress-ng
Bash:
nice stress-ng --vm $(nproc) --vm-bytes 86% --vm-keep --vm-populate --vm-madvise willneed --verify -v -t 4h --tz --perf
while simultaneously watching ras-mc-ctl and its rasdaemon for errors:
Bash:
#!/bin/sh
systemctl stop rasdaemon
rm -f /var/lib/rasdaemon/ras-mc_event.db
systemctl start rasdaemon
exec watch -n 5 \
"ras-mc-ctl --summary | \
grep -v '^$'; echo \"\"; ras-mc-ctl --error-count; echo \"\"; free -h ; echo \"\"; \
journalctl -b -n 500 | \
grep -Ev \"( (systemd|systemd-logind|smbd|dbus-daemon|systemd-networkd|polkitd|sshd)\\[[0-9]+\\]: )|kernel: (cdc_ether|usb) \" | \
tail -n20"
CPU #2 suddenly produced hundreds of generic memory controller errors. Not specific to a certain DIMM, so their errors stayed all zero. But something else was obviously up. On a second run, system froze solid after ~3 hrs. I was done here.
On a similar note: If you buy ECC RAM, I can recommend everyone run Passmark Memtest (the Pro version, if you have it) to scan for easy to spot errors. This was the only Memtest that would reliably report DIMM errors from the CPU's memory controller. I tested also Microsoft Windows memory diagnostics, which reported nothing (ECC corrected the errors). Freeware Memtest86+ also reported nothing. Under Linux it was hard to not trigger the OOM killer when using stress-ng, so 86% was found by me through trial and error. 1/32th of RAM as zram swap, or true swap file on the order of a few GB will help. But it took not long like only some minutes for rasdaemon and ras-mc-ctl to report weird stuff going on in the CPU/RAM complex. There shouldn't be any errors, not within the 4 hours I ran the test for. These were all Samsung M393A4K40BB2-CTD6Y DDR4 RDIMM 2666 MHz. So two out of 18 broken, maybe also mishandled by the recycling industry.
Edit, today is July 8th 2022... in case anyone is interested...
In case 1, after weeks of waiting and really pushing for a solution from ebay agents in their chat from my side, ebay refunded me. Nothing would have happened without me aggressively querying about the case and if there is a need for further documentation. There was, but ebay neglected to tell me. Funny how they do send you 10 emails when you buy a pen for 10 cents. The case just sat there, without progress. One agent promised a refund, nothing happened.
In case 2, the X was UNIXSurplus. They did not refund shipping (~130 to+from me) and I had to file 20 pages of paperwork to try and reclaim 150 of import tax. So their choice of doing business, which you can see below, cost me 280 bucks right now. Only 130 if German customs refunds me, which is more like a 50:50 affair. Also, item returned to them on June 27th and 9 days later and only after inquiring, a refund was initiated.
Case 3 (bad RAM) was a German seller, resolved by swapping for good parts.
There also was a "case 4", consisting of Netapp interposers, from California again, ebay again (will I ever learn), in the ad was the right picture, but sent wrong item. 50 items, no less. Refunded by seller after sending what was sent and what was advertised.
Lessons... no return policy from seller, red flag. 10k or 20k of sales of products all over the place and you are not exactly buying a pack of sponges for 1.50 but an off-roadmap 3647 CPU, red flag. Seller refuses to send picture of original item to be sent, red flag. Seller refuses to be called, red flag.
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