--- title: This one BIOS setting makes your PC boot twice as fast,... description: Slow boot times on DDR5 PCs are usually caused by memory training, a calibration routine the motherboard runs during POST to find stable RAM voltages, timings,... canonical: https://daily.dev/posts/this-one-bios-setting-makes-your-pc-boot-twice-as-fast-and-motherboards-still-ship-with-it-turned-o-ww0qnbunx twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: This one BIOS setting makes your PC boot twice as fast, and motherboards still ship with it turned off | daily.dev og:description: Slow boot times on DDR5 PCs are usually caused by memory training, a calibration routine the motherboard runs during POST to find stable RAM voltages, timings,... og:url: https://daily.dev/posts/this-one-bios-setting-makes-your-pc-boot-twice-as-fast-and-motherboards-still-ship-with-it-turned-o-ww0qnbunx og:image: https://api.daily.dev/og/posts/Ww0QnbuNx.png og:image:alt: This one BIOS setting makes your PC boot twice as fast, and motherboards still ship with it turned off og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # This one BIOS setting makes your PC boot twice as fast, and motherboards still ship with it turned off **[XDA Developers](https://daily.dev/sources/xda-developers)** · 4 min read · 0 upvotes · 0 comments ## Summary Slow boot times on DDR5 PCs are usually caused by memory training, a calibration routine the motherboard runs during POST to find stable RAM voltages, timings, and signal strengths. Enabling the BIOS setting Memory Context Restore (MCR) lets the system reuse previously stable parameters instead of re-training from scratch, roughly halving boot time in the author's tests. On Ryzen 7000 (AM5) boards, MCR should be paired with Power Down Enable to avoid black screens, failed restarts, or BSoDs; MCR should be disabled before changing DIMMs, timings, or EXPO profiles, and a CMOS reset forces fresh training if instability occurs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why does my DDR5 PC take so long to boot compared to my old DDR4 system? DDR5 systems generally boot slower because of memory training, a BIOS calibration routine run during POST that tests voltages, sub-timings, signal strengths, and data alignments to find a stable configuration between the CPU memory controller and RAM. DDR5 is harder to run reliably than DDR4 because it operates at much higher transfer rates with a more complex memory architecture, and most users also run EXPO overclocking profiles, which adds to the training time. _daily.dev surfaces practical hardware fixes like this for people chasing faster boot times._ ### What does the Memory Context Restore (MCR) BIOS setting actually do? Memory Context Restore lets the motherboard reuse the stable memory parameters found during a previous boot instead of running the full memory training routine again, which can roughly halve cold-boot time on DDR5 systems. It has no effect on memory bandwidth, latency, or overall performance; its only measurable impact is on boot time from a cold start. _Developers tuning their own dev rigs track hardware tweaks like MCR through daily.dev._ ### Is it safe to enable Memory Context Restore on a Ryzen 7000 AM5 motherboard? It can cause black screens, failed restarts, or BSoDs on some AM5 boards unless the Power Down Enable setting is also turned on alongside it, based on reports from overclocking forum users. MCR should also be disabled before changing DIMMs, timings, or EXPO settings, since it assumes the last known memory configuration is still valid; a CMOS reset forces fresh training if instability occurs. _Anyone tuning AM5 systems can keep tabs on hardware gotchas like this via daily.dev._ ## Similar posts on daily.dev - [Your AM5 boot time is slower than it should be, and it's probably not your CPU](https://daily.dev/posts/your-am5-boot-time-is-slower-than-it-should-be-and-it-s-probably-not-your-cpu-ivp5nmwql) · XDA Developers · 0 upvotes · 0 comments - [I disabled the AM5 BIOS setting everyone uses, and my random crashes finally stopped](https://daily.dev/posts/i-disabled-the-am5-bios-setting-everyone-uses-and-my-random-crashes-finally-stopped-7ovc6xsvr) · XDA Developers · 0 upvotes · 0 comments - [Your BIOS is playing it safe with 3 settings that should've been enabled years ago](https://daily.dev/posts/your-bios-is-playing-it-safe-with-3-settings-that-should-ve-been-enabled-years-ago-v3quubdhy) · XDA Developers · 0 upvotes · 0 comments - [I change these 4 BIOS settings on every PC I build, and they make a real difference](https://daily.dev/posts/i-change-these-4-bios-settings-on-every-pc-i-build-and-they-make-a-real-difference-yzu27j3w3) · XDA Developers · 0 upvotes · 0 comments - [The first thing I check in every new PC's BIOS is a setting most people leave switched off by accident](https://daily.dev/posts/the-first-thing-i-check-in-every-new-pc-s-bios-is-a-setting-most-people-leave-switched-off-by-accide-b0kkgtcsr) · XDA Developers · 0 upvotes · 0 comments --- Tags: [#hardware](https://daily.dev/tags/hardware), [#amd](https://daily.dev/tags/amd) [View this post on daily.dev](https://daily.dev/posts/this-one-bios-setting-makes-your-pc-boot-twice-as-fast-and-motherboards-still-ship-with-it-turned-o-ww0qnbunx) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"This one BIOS setting makes your PC boot twice as fast, and motherboards still ship with it turned off","url":"https://daily.dev/posts/this-one-bios-setting-makes-your-pc-boot-twice-as-fast-and-motherboards-still-ship-with-it-turned-o-ww0qnbunx","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/this-one-bios-setting-makes-your-pc-boot-twice-as-fast-and-motherboards-still-ship-with-it-turned-o-ww0qnbunx"},"datePublished":"2026-08-13T11:04:23.465Z","dateModified":"2026-08-13T11:05:01.016Z","description":"Slow boot times on DDR5 PCs are usually caused by memory training, a calibration routine the motherboard runs during POST to find stable RAM voltages, timings,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6d4be2c50d2feeea2e8bad3dcf0b8582?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6d4be2c50d2feeea2e8bad3dcf0b8582?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"XDA Developers","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"XDA Developers","logo":"https://media.daily.dev/image/upload/s--kCg6yyAP--/f_auto,q_auto/v1774964407/logos/xda-developers?_a=BAMAMiWQ0","url":"https://daily.dev/sources/xda-developers"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/this-one-bios-setting-makes-your-pc-boot-twice-as-fast-and-motherboards-still-ship-with-it-turned-o-ww0qnbunx","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"hardware,amd","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"XDA Developers","item":"https://daily.dev/sources/xda-developers"},{"@type":"ListItem","position":3,"name":"This one BIOS setting makes your PC boot twice as fast, and motherboards still ship with it turned off"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/this-one-bios-setting-makes-your-pc-boot-twice-as-fast-and-motherboards-still-ship-with-it-turned-o-ww0qnbunx#faq","mainEntity":[{"@type":"Question","name":"Why does my DDR5 PC take so long to boot compared to my old DDR4 system?","acceptedAnswer":{"@type":"Answer","text":"DDR5 systems generally boot slower because of memory training, a BIOS calibration routine run during POST that tests voltages, sub-timings, signal strengths, and data alignments to find a stable configuration between the CPU memory controller and RAM. DDR5 is harder to run reliably than DDR4 because it operates at much higher transfer rates with a more complex memory architecture, and most users also run EXPO overclocking profiles, which adds to the training time. daily.dev surfaces practical hardware fixes like this for people chasing faster boot times."}},{"@type":"Question","name":"What does the Memory Context Restore (MCR) BIOS setting actually do?","acceptedAnswer":{"@type":"Answer","text":"Memory Context Restore lets the motherboard reuse the stable memory parameters found during a previous boot instead of running the full memory training routine again, which can roughly halve cold-boot time on DDR5 systems. It has no effect on memory bandwidth, latency, or overall performance; its only measurable impact is on boot time from a cold start. 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