For clarification on what motherboards these will work on, AFAIK that’s set by what motherboard Intel needs to use the CPU on since people likely won’t want them when they’re useless with any consumer motherboard.
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Recently, 闲鱼 has had a lot of prototype Intel CPUs 
that _DON’T_ work on most motherboards appear on the market. I’m not going to link the listings for all 4 images, but here’s one of the listings which have a lot in stock. #IntelInternal
https://market.m.taobao.com/app/idleFish-F2e/widle-taobao-rax/page-detail?wh_weex=true&wx_navbar_transparent=true&id=657084933642&ut_sk=1.YJoLAD//WNUDAGMFfeGRFV5N_12431167_1636634259409.Copy.detail.657084933642.2200771515257&forceFlush=1 …pic.twitter.com/c4bZsnfgW0
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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There is many ES/QS CPU on ebay. I’ve got a Gold 6142 last year for 200usd, you just a moded bios
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Ahhh, thanks for letting me know
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