A brand-new Antminer S21 Pro costs between $5,000-8,000 in 2025. A used S19 XP, however, can be had for $800-1,500. The difference is enormous \u2014 but is it worth it? The used ASIC market is one of the most exciting and riskiest segments of crypto mining, where the well-informed buyer can save a fortune, while the naive buyer pays dearly for their ignorance.<\/p>\n
A v\u00e1lasz egyszer\u0171: 30-60%-os megtakar\u00edt\u00e1s<\/strong> az \u00faj \u00e1rhoz k\u00e9pest. Medve piacon ez az ar\u00e1ny m\u00e9g dr\u00e1maibb lehet \u2014 a 2022-es kriptotelben az S19 Pro g\u00e9pek \u00e1ra 90%-ot esett a cs\u00facshoz k\u00e9pest. Aki ekkor v\u00e1s\u00e1rolt, a k\u00f6vetkez\u0151 bull run-ban t\u00f6bbsz\u00f6r\u00f6s megt\u00e9r\u00fcl\u00e9st \u00e9rt el.<\/p>\n Ez a klasszikus anchoring<\/strong> (horgonyz\u00e1s) jelens\u00e9g m\u0171k\u00f6d\u00e9s k\u00f6zben: az \u00faj \u00e1r lesz a referenciapont, \u00e9s ehhez k\u00e9pest a haszn\u00e1lt \u00e1r \u201ehihetetlen akci\u00f3nak” t\u0171nik \u2014 m\u00e9g akkor is, ha a g\u00e9p val\u00f3s \u00e9rt\u00e9ke a hat\u00e9konys\u00e1ga \u00e9s nem az eredeti lista\u00e1ra alapj\u00e1n m\u00e9rend\u0151.<\/p>\n A haszn\u00e1lt piac tov\u00e1bbi el\u0151nye az azonnali el\u00e9rhet\u0151s\u00e9g<\/strong>. \u00daj g\u00e9pekn\u00e9l h\u00f3napokat kell v\u00e1rni a sz\u00e1ll\u00edt\u00e1sra, m\u00edg egy haszn\u00e1lt ASIC-ot ak\u00e1r napokon bel\u00fcl \u00fczembe helyezhetsz. A b\u00e1ny\u00e1szatban az id\u0151 sz\u00f3 szerint p\u00e9nz: minden nap, amit nem b\u00e1ny\u00e1szol, elveszett bev\u00e9tel.<\/p>\n The most common problems with used ASICs:<\/p>\n Haszn\u00e1lt g\u00e9pre jellemz\u0151en nincs gy\u00e1rt\u00f3i garancia<\/strong>. Ez azt jelenti, hogy minden jav\u00edt\u00e1s a te zsebedb\u0151l megy. Egy hashboard csere 200-500 doll\u00e1r, egy t\u00e1pegys\u00e9g 150-300 doll\u00e1r \u2014 ezek az \u00f6sszegek gyorsan felem\u00e9szhetik a v\u00e1s\u00e1rl\u00e1skor megtakar\u00edtott p\u00e9nzt.<\/p>\n A vesztes\u00e9gker\u00fcl\u00e9s<\/strong> (loss aversion) itt k\u00fcl\u00f6n\u00f6sen er\u0151s: a haszn\u00e1lt g\u00e9p olcs\u00f3bb beszerz\u00e9si \u00e1ra miatt hajlamosak vagyunk al\u00e1becs\u00fclni a rejtett k\u00f6lts\u00e9geket, mert a \u201em\u00e1r megsp\u00f3rolt” p\u00e9nzt ment\u00e1lisan m\u00e1s sz\u00e1ml\u00e1ra k\u00f6nyvelj\u00fck.<\/p>\n Ask for test results: are all three hashboards working, and does the actual hashrate match the specifications? An S19 XP should deliver 140 TH\/s \u2014 if it shows 120 TH\/s, something's off. <\/p>\n During normal operation, chip temperature ranges between 65-85\u00b0C. If it's above 90\u00b0C, it suggests worn-out thermal paste or damaged chips. Request a pool dashboard screenshot showing temperature data. <\/p>\n Ask where and how long the machine has been running. An ASIC that ran in a dusty, 40\u00b0C container is in much worse condition than one operating in an air-conditioned room. Unfortunately, operating hours can't always be precisely verified. <\/p>\n Check that the original factory firmware is running. If not, flash it back to the original before purchasing \u2014 or at least beforehand. <\/p>\n | Platform | El\u0151ny\u00f6k | H\u00e1tr\u00e1nyok | |———-|———|———–| | Kaboomracks<\/strong> | Specializ\u00e1lt, tesztelt g\u00e9pek, garancia | Magasabb \u00e1r | | eBay<\/strong> | Nagy v\u00e1laszt\u00e9k, vev\u0151v\u00e9delem | Kock\u00e1zatos elad\u00f3k, neh\u00e9z ellen\u0151rz\u00e9s | | Compass Mining Resale<\/strong> | Megb\u00edzhat\u00f3 platform, hosting lehet\u0151s\u00e9g | Korl\u00e1tozott k\u00e9szlet | | Telegram csoportok<\/strong> | Legolcs\u00f3bb \u00e1rak | Nincs vev\u0151v\u00e9delem, \u00e1tver\u00e9s kock\u00e1zat | | Bitmain fel\u00faj\u00edtott<\/strong> | Gy\u00e1ri garancia, tesztelt | Dr\u00e1g\u00e1bb, mint a mag\u00e1npiaci haszn\u00e1lt |<\/p>\n A t\u00e1rsas bizony\u00edt\u00e9k<\/strong> (social proof) csapd\u00e1ja itt k\u00fcl\u00f6n\u00f6sen vesz\u00e9lyes: egy Telegram csoportban mindenki dics\u00e9ri az elad\u00f3t, de ezek lehetnek bot fi\u00f3kok vagy az elad\u00f3 ismer\u0151sei. Mindig k\u00e9rj f\u00fcggetlen referenci\u00e1t \u00e9s escrow-t (let\u00e9ti szolg\u00e1ltat\u00e1st).<\/p>\n A d\u00f6nt\u0151 mutat\u00f3 a J\/TH<\/strong> (Joule per Terahash) \u2014 vagyis az energiahat\u00e9konys\u00e1g. Egy S17 (kb. 50 J\/TH) ma m\u00e1r gazdas\u00e1gtalan a legt\u00f6bb \u00e1ram\u00e1ron, hiszen az S21 gener\u00e1ci\u00f3 17-18 J\/TH-val m\u0171k\u00f6dik. Haszn\u00e1lt g\u00e9p v\u00e1s\u00e1rl\u00e1s\u00e1nak csak akkor van \u00e9rtelme, ha:<\/p>\n The S19 series is a borderline case in 2026: at 21-30 J\/TH, with electricity rates below 0.05 USD\/kWh it's still viable, but above 0.10 USD\/kWh it's already unprofitable. <\/p>\n \u00c9rdekes fejlem\u00e9ny, hogy a haszn\u00e1lt ASIC piac egy \u00faj ipar\u00e1gat is sz\u00fclt: a hashboard jav\u00edt\u00e1st<\/strong>. Speci\u00e1lis szaktud\u00e1ssal \u00e9s n\u00e9h\u00e1ny ezer doll\u00e1ros beruh\u00e1z\u00e1ssal (mikroszk\u00f3p, forraszt\u00f3\u00e1llom\u00e1s, chip teszter) egy v\u00e1llalkoz\u00f3 szellem\u0171 b\u00e1ny\u00e1sz olcs\u00f3n felv\u00e1s\u00e1rolhat hib\u00e1s g\u00e9peket, megjav\u00edthatja \u00e9s tov\u00e1bbadhatja \u0151ket \u2014 vagy saj\u00e1t flott\u00e1j\u00e1t b\u0151v\u00edtheti minim\u00e1lis k\u00f6lts\u00e9ggel.<\/p>\n A haszn\u00e1lt ASIC piac nem a gy\u00e1v\u00e1knak val\u00f3, de nem is a vakmer\u0151knek. A kulcs a due diligence<\/strong>: tesztelj, ellen\u0151rizz, sz\u00e1molj. Aki a \u201et\u00fal j\u00f3, hogy igaz legyen” aj\u00e1nlatokra ugrik, az a meger\u0151s\u00edt\u00e9si torz\u00edt\u00e1s<\/strong> \u00e1ldozata \u2014 azt a bizony\u00edt\u00e9kot keresi, ami az olcs\u00f3 v\u00e9telt igazolja, mik\u00f6zben figyelmen k\u00edv\u00fcl hagyja a vesz\u00e9lyjeleket. De aki t\u00fcrelmesen, inform\u00e1ltan v\u00e1s\u00e1rol, az a medve piacon vetett magot a bull run arat\u00e1s\u00e1hoz.<\/p>\n Egy vadonat\u00faj Antminer S21 Pro \u00e1ra 2025-ben 5 000-8 000 doll\u00e1r k\u00f6z\u00f6tt mozog. Egy haszn\u00e1lt S19 XP-t viszont m\u00e1r 800-1 500 doll\u00e1r\u00e9rt is megkaphatsz. A k\u00fcl\u00f6nbs\u00e9g \u00f3ri\u00e1si \u2014 de vajon meg\u00e9ri? A haszn\u00e1lt ASIC piac a kriptob\u00e1ny\u00e1szat egyik legizgalmasabb \u00e9s legkock\u00e1zatosabb szegmense, ahol a j\u00f3l inform\u00e1lt v\u00e1s\u00e1rl\u00f3 vagyont takar\u00edthat meg, a naiv vev\u0151 pedig dr\u00e1g\u00e1n […]<\/p>\n","protected":false},"author":1,"featured_media":1027,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[22,123,21,4,54,114,119,130,128,58],"class_list":["post-898","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-banyaszat","tag-antminer","tag-asic","tag-banyaszat","tag-bitcoin","tag-bitmain","tag-blockchain","tag-hashrate","tag-kornyezet","tag-pool","tag-scram"],"_links":{"self":[{"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/posts\/898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/comments?post=898"}],"version-history":[{"count":1,"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/posts\/898\/revisions"}],"predecessor-version":[{"id":1028,"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/posts\/898\/revisions\/1028"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/media\/1027"}],"wp:attachment":[{"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/media?parent=898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/categories?post=898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kriptoblog.hu\/en\/wp-json\/wp\/v2\/tags?post=898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}The Real Face of Risks<\/h2>\n
Hardware Risks<\/h3>\n
\n
Warranty and Legal Protection<\/h3>\n
What to Watch Before Buying?<\/h2>\n
1. Hashboard Testing<\/h3>\n
2. Chip Temperature<\/h3>\n
3. Operating Hours and Environment<\/h3>\n
4. Firmware Authenticity<\/h3>\n
Where to Buy?<\/h2>\n
When Is It NOT Worth Buying Used?<\/h2>\n
\n
Hashboard Repair: Not Just a Risk, but a Business Opportunity<\/h2>\n
Summary \u2014 The Art of Smart Buying<\/h2>\n
\nSources<\/h3>\n