Jeff Geerling
Developer, author and YouTuber covering Raspberry Pi, homelab hardware and Ansible automation. Author of Ansible for DevOps.
Jeff Geerling did not write this page. ppll compiled it from their own words, each linked to the source. Is this you? · Report a mistake
Latest GitHub
What they believe
-
Restricting a device owner's ability to swap or upgrade internal components is a loss for hardware ownership.
But in the end, it's just another sad loss in hardware ownership, that you can't swap out or upgrade the RAM chips.
jeffgeerling.comSaid 21 Sept 2026This on korrents
-
Any remote-control device on your network should be treated as an open door and locked down accordingly
Any form of remote control needs to be treated like an open door into your network—make sure you put a good lock on it.
jeffgeerling.comSaid 5 Jun 2026This on korrents
The bold line is korrents’ wording; the quote is theirs. These 2: what they wrote before what they said aloud, one per source, newest first.
Feed
As its own page →Hiding
19 October
14 October
- x.com
- x.com
- GitHubjeffgeerling-com — Drupal Codebase for JeffGeerling.com
+ 3 more
13 October
11 October
10 October
9 October
7 October
6 October
5 October
4 October
3 October
2 October
1 October
30 September
29 September
25 September
23 September
22 September
21 September
From one piece Raspberry Pi locks down Pi 5 RAM upgrades in firmware 2 beliefs · jeffgeerling.com
-
Their words
Memory timings, especially for modern LPDDR chips, are tricky to get right, and having a bad solder joint, or a cheap RAM chip that only barely passed validation, means you get weird failure modes.
-
korrents.com
Restricting a device owner's ability to swap or upgrade internal components is a loss for hardware ownership.Their words
But in the end, it's just another sad loss in hardware ownership, that you can't swap out or upgrade the RAM chips.
18 September
Nothing matches.
Beliefs
Korrents What they believe 3 beliefs — each backed by an exact quote.
Each is a — compiled by korrents.com, not by them: the one-line wordings are korrents', the quotes are theirs.
Recent
Restricting a device owner's ability to swap or upgrade internal components is a loss for hardware ownership.
But in the end, it's just another sad loss in hardware ownership, that you can't swap out or upgrade the RAM chips.
Raspberry Pi locks down Pi 5 RAM upgrades in firmware Said 21 Sept 2026
Getting memory timings right for modern LPDDR RAM chips is technically difficult, and a marginal chip or a bad solder joint can cause unpredictable failure modes.
Memory timings, especially for modern LPDDR chips, are tricky to get right, and having a bad solder joint, or a cheap RAM chip that only barely passed validation, means you get weird failure modes.
Raspberry Pi locks down Pi 5 RAM upgrades in firmware Said 21 Sept 2026
Any remote-control device on your network should be treated as an open door and locked down accordingly
Any form of remote control needs to be treated like an open door into your network—make sure you put a good lock on it.
I tested every IP KVM in my Homelab Said 5 Jun 2026
What is a korrent?
A korrent is a belief a person has stated in their own words: one sentence stating the claim, backed by a quote and a source, kept at korrents.com.
Under a name here, the quoted block is what they actually said. The korrent beneath it is the claim those words support, in korrents' wording — tap it to see the record, its source, and who else holds it.
Nobody here wrote their own korrents. They are compiled from public statements, and a person can change their mind, which is recorded too.
Recommends rcmnd
rcmnd What they recommend 9 things — each backed by an exact quote.
Compiled by rcmnd.app, not by them: the quotes are theirs, and each links to the post it was copied from.
Recent
Liked DezKVM-Go
If this were $200 I'd complain, but not for $25. For that, it's a neat little box that maybe more people could contribute to, to make it the most handy way to jack in from a crash cart.
jeffgeerling.com 5 Jun 2026
sponsored
Mixed on BliKVM
Starting over over $200 for a cheaper Allwinner version, they're outclassed by newer KVMs.
jeffgeerling.com 5 Jun 2026
sponsored
Liked Sipeed NanoKVM Pro
Show 6 more
Liked Sipeed NanoKVM Cube
But I still like the Cube, if for no other reason than it showed manufacturers you could build tiny IP KVMs under $100.
jeffgeerling.com 5 Jun 2026
sponsored
Uses JetKVM
The KVM I use the most around the Studio is the JetKVM. It's tiny, bus-powered, and simple. And most of the time, that's all I need.
jeffgeerling.com 5 Jun 2026
sponsored
Recommends PiKVM
My Dad and I tested all the PiKVM models, and I like everything but the price. I 100% recommend them, especially since you're directly supporting the folks who wrote the software.
jeffgeerling.com 5 Jun 2026
sponsored
Recommends Framework Laptop 13
For now, I think Framework's 13" lineup is more compelling if you favor repairability/upgradeability and top-tier Linux support.
jeffgeerling.com 29 May 2026
Liked MacBook Neo
I had already put both laptops through my benchmark gauntlet, which revealed one theme: the Mac is faster (in most cases), more efficient, quieter, built better, has a much nicer display, and costs much less.
jeffgeerling.com 29 May 2026
Mixed on Framework Laptop 12
the Framework 12 isn't a bad laptop
jeffgeerling.com 29 May 2026
Where they publish
Site jeffgeerling.com Blog covering Raspberry Pi, homelab hardware reviews, networking and Ansible.
Recent
- Formlabs dropped the Raspberry Pi on the way to a $699 SLA printer 14 Oct 2026 Formlabs sent me a Form Studio 1 resin 3D printer to test after years of back-and-forth about their Form 4 printer. Like the Form 4, it's an SLA (stereolithography) printer, but unlike the Form 4 (which starts at $2,600…
- Radxa's Q8B has 2x the performance and expansion of the Pi 5 9 Oct 2026 There was a time I'd look at a board like the Radxa Dragon Q8B (at left, above) and be like, "there's no way I'd spend $209 on an SBC with 8 gigs of RAM". But we're in 2026, and seeing the 8 gig Raspberry Pi 5 going for…
- I'm starting HomelabFest (in St. Louis, Sep 2027) 25 Sept 2026 I've been working on my homelab for years, and I enjoy sharing what I learn through this blog and my YouTube channel. Over the past few years, I realized the homelab community (which isn't really a defined thing—that's…
Show 17 more
- Raspberry Pi locks down Pi 5 RAM upgrades in firmware 21 Sept 2026 Raspberry Pi added a feature in their firmware that restricts users from swapping RAM chips, sometimes even RAM chips of the same capacity from other Raspberry Pi boards. Apparently there were people buying cheap 1 or 2…
- NTP, an atomic clock, and having a great time at the world's largest VCF 18 Sept 2026 I'm back from VCF Midwest 21, arguably the largest vintage computer festival on the planet. After being blown away last year, I decided to get a table of my own this year, to demonstrate NTP Time on a bunch of old Macs,…
- OpenNMC is an open replacement for expensive APC management cards 8 Sept 2026 UPSes are typically the most boring part of your homelab, but they're important. One of their main jobs is to give servers time to shut down safely if the power goes out. Another job is to condition your power so your s…
- Rebuilding a 1995 GPS Time Server so I don't get Telstra'd 4 Sept 2026 In June I purchased this TrueTime XL-AK time server, so I could learn more of the history of GPS-based time. I received it on June 22, and just 16 days later a similar GPS time server took down Australia's cell service…
- Before NTP there were Time and Daytime 30 Aug 2026 In building an NTP time demo on old Macs for VCF Midwest, I came across RFC 867 and RFC 868, for the 'Daytime' and 'Time' Protocols, respectively. My first exposure to any form of network time was when I upgraded from a…
- Building a mini Homelab that fits in my carry-on 28 Aug 2026 I'm traveling to Chicago for VCF Midwest next month. I'll be demoing NTP time history on vintage Macs, with my own GPS-derived NTP service hosted on an Xserve G5, synced via NTP or a strange AppleTalk timing extension f…
- Debugging Ubiquiti's 5G Backup on AT&T 25 Aug 2026 For a mobile 'mini homelab' project I'm working on, I wanted to use 5G Internet as a primary 'on-to-go' connection, but still have the ability to plug in another Internet connection when I put the mobile rack I'm buildi…
- Getting the Steam Deck LCD working on a Raspberry Pi 20 Aug 2026 The BOE TV070WXM-TV0 LCD used in the original Steam Deck can be had for around $30. It's a serviceable 7" touchscreen with 400 nits of brightness and a resolution of 1280x800 (for a sharp 216 ppi). The specs are a lot n…
- Hands-on with Raspberry Pi's CM5 Programming Jig 19 Aug 2026 In the before-times, when Raspberry Pi CM5s were (relatively) affordable, I built a number of Pi clusters (example), and one of the most annoying parts of the build was flashing Raspberry Pi OS to all the Pis. One, two,…
- I'm excited for Intel after testing the XPS 13 7 Aug 2026 Shortly after Apple launched the budget MacBook Neo, Dell announced their response, a new low-end XPS 13. Matching the Neo's current pricing, it starts at $699, or $599 with an educational discount. That discount is cur…
- Proxmox officially supports Arm, with some caveats 5 Aug 2026 Proxmox today announced their Proxmox Virtual Environment is now available for 64-bit ARM. I tested it on my Ampere Altra Dev Platform—the same machine on which I've booted Windows on Arm the first time, messed with mul…
- Getting 25 Gbps Thunderbolt Ethernet on my Mac Studio 31 Jul 2026 I've been using the built-in 10 Gigabit Ethernet on my Mac Studio for a few years. It works fine: I can edit 4K video straight off my NAS over the network, and run backups at around 1 GB/sec. But... I want more. I upgra…
- Adding a backup Internet WAN on my OPNsense Router 23 Jul 2026 AKA "Spectrum has gone down two weeks in a row and I'm sick of it". I've been borrowing a portable 5G gateway from my Dad for a few weeks, for testing... and two weeks in a row, I've used it as a backup Internet option,…
- Open Sauce and GPS time were my summer AI Antiseptics 22 Jul 2026 In the midst of our AI slop revolution, traveling to the West coast for Open Sauce this past weekend was the perfect antiseptic for rising costs, summer heat, and online divisiveness. It's ironic, then, that I used Clau…
- QuadRF can spot drones and see WiFi through my wall 10 Jul 2026 The QuadRF (pictured above) a phased-array radio built around a Raspberry Pi 5 and an FPGA board with picosecond-level timing. It does advanced signal processing and beamforming. It can see WiFi through walls and track…
- The Special Value Pi 4 was extremely short-lived 8 Jul 2026 The 'Special Value' Pi 4 pictured above is probably the rarest Raspberry Pi I own—even rarer than my blue special edition Pi. A Raspberry Pi reseller briefly listed a special 'value edition' Pi 4. But the product page 4…
- Quickly apply LUTs (color grading) with ffmpeg 26 Jun 2026 This is a quick post, mostly for my own reference. I've avoided LUTs and 'Log' video footage for years1, mostly because of the extra tiny bit of workflow involved. Like RAW photos, 'Log' footage retains the video sensor…
Link verified 4 Sept 2026. Recent items update automatically from the channel.
x.com @geerlingguy Short posts about hardware and homelab work.
Recent
- Get well soon! And be careful installing Haiku on all the medical devices while you're there—some of them might be important. 14 Oct 2026
- It was great talking to @D_Towski at @stlpublicradio about our wild hot dog RF experiments with AM radio for St. Louis On the Air! 14 Oct 2026 stlpr.org
- Formlabs sent me a Form Studio 1 resin printer to test. It's $699 (compared to Form 4, it's almost 4x cheaper!), and it prints well. But I also talked to their engineers a bit about value engineering, and why they dropped the Raspberry Pi in this model: 14 Oct 2026
Show 17 more
- This week @AlecSteeleSteel popped up on page 2 of 'your audience also watches', so I'm guessing most Pi/maker/devs are probably also fascinated by his power hammer restoration, lol. It's the current version of Sampson Boat Co's Tally Ho rebuild, and I can't get enough. 11 Oct 2026
- The Radxa Dragon 8QB is more than 2x faster than the Pi 5, has tons more I/O, and only costs a little more... but good luck finding one :( Today's video goes into the details: 9 Oct 2026
- NTS-200 NTP Time server from early 2000s was handed to me at VCF Midwest. It works! Just... off by 19 years ;) I put a DC block on the antenna input though, don't want it to fry my GPS splitter! I may be able to get it to 2026, we'll see. 7 Oct 2026
- Probably chatting with my Bosch dishwasher 6 Oct 2026
- Only $300 off the $5,000 fundraising goal for the @UOAA, thanks to the $2k matching gift from my livestream sponsor @TwingateHQ yesterday! Huge thanks to them and to all of YOU who donated to help this worthy group helping ostomates everywhere! 5 Oct 2026
- Why does the favicon for Google Sheets seem to change on a weekly basis lately? Who on Google's brand team is swapping these things out all the time! 5 Oct 2026
- So happy to celebrate Ostomy Awareness Day with my beautiful wife (after this morning's @UOAA fundraiser livestream), the same week as our anniversary — 16 years in, still learning new things together daily! 4 Oct 2026
- 45 minutes until the annual livestream! Let's upgrade the SE/30 to the gills! 3 Oct 2026 youtube.com
- RAM's so expensive I don't know if I'll ever upgrade my PCs again. So join me tomorrow while I upgrade my 1989 *Mac* SE/30, for the annual UOAA Ostomy Day fundraiser livestream! 9a Central / 10a Eastern / 2p UTC: 2 Oct 2026 youtube.com
- AAAAH FIBER!!! After four years of pestering AT&T, it is finally here! (And I can finally join the NTP Pool... eventually, it'll be a video of course!) 1 Oct 2026
- I'm so glad I got to meet Nick at NAB this past year! I've been reading my Dad's hand-me-down copies of Radio World for probably 30+ years, I love that they still have writers who care about the industry and get to do cool things in the community! cc @GeerlingEng @radijoe 30 Sept 2026
- This will likely sell out fast. But if it does, I may be able to expand the room block. 29 Sept 2026
- Meta charges $39.99/month if you want to share more than two links a month now from a Page?! What a weird cash grab... 29 Sept 2026
- ShadyTel builds an entire phone company for one weekend, every year, at VCF Midwest. This year they added a GNSS frequency standard for their T1 network, and it was sitting under my NTP Time table! Video: 29 Sept 2026 youtube.com
- This'll be a long shot, but does anyone I here from STL know anyone at @BeldenInc? I would love to have them at @HomelabFest 29 Sept 2026
- Super Early Bird *and* Early Bird tickets already sold out this weekend. And only ~300 general admission tickets left... I'm seeing what I can do to raise the attendance at this point, but there's a chance we'll run out of tickets by next week. @HomelabFest 28 Sept 2026
- I'm starting a homelab festival (you're invited): 25 Sept 2026
Link verified 4 Sept 2026. Recent items update automatically from the channel.
YouTube Jeff Geerling on YouTube Hardware reviews and homelab projects; the video companion to the blog.
Recent
Link verified 4 Sept 2026. Recent items update automatically from the channel.
GitHub github.com/geerlingguy Ansible roles, Pi cluster and benchmarking repos.
Recent
- pi-overvolt — Pi Overvolt firmware hack - WARNING: USE AT YOUR OWN RISK! 19 Oct 2026
- youtube — YouTube channel repo. Stuff that doesn't fit elsewhere. 19 Oct 2026
- jeffgeerling-com — Drupal Codebase for JeffGeerling.com 14 Oct 2026
Show 16 more
- ansible-role-swap — Ansible Role - Swap 13 Oct 2026
- sbc-reviews — Jeff Geerling's SBC review data - Raspberry Pi, Radxa, Orange Pi, etc. 10 Oct 2026
- ansible-role-postgresql — Ansible Role - PostgreSQL 9 Oct 2026
- temperature-monitor — Raspberry Pi-based home temperature monitoring network. 7 Oct 2026
- raspberry-pi-pcie-devices — Raspberry Pi PCI Express device compatibility database 4 Oct 2026
- time-pi — Raspberry Pi stratum 1 PTP and NTP timeserver configuration. 2 Oct 2026
- mesh-nodes — Meshtastic configs, LoRa notes, experimental mesh stuff. 29 Sept 2026
- timemachines-flash — TimeMachines Clock Flasher utility that runs on Mac, Linux, or Windows 23 Sept 2026
- top500-benchmark — Automated Top500 benchmark for clusters or single nodes. 22 Sept 2026
- ansible-role-php-versions — Ansible Role - PHP Versions 22 Sept 2026
- vcfmw21-map — VCF Midwest 21 Interactive Exhibitor Map 9 Sept 2026
- BigClock-Classic — A Big Clock for Classic Mac OS. 9 Sept 2026
- ansible-role-security — Ansible Role - Security 8 Sept 2026
- ansible-role-puppet — Ansible Role - Puppet 8 Sept 2026
- ansible-role-php-xdebug — Ansible Role - PHP Xdebug 8 Sept 2026
- ansible-role-php — Ansible Role - PHP 8 Sept 2026
Link verified 4 Sept 2026. Recent items update automatically from the channel.
About the English under a post
Some people here publish in a language other than English. Where they do, this site shows a machine translation beneath the post, in this typeface — the site's own, not theirs.
The post itself is never changed, moved or hidden: what is set in the serif above is exactly what the person published, and it is what to quote them on. A translation can be wrong in ways that matter, especially about tone.
Only the post's own words are translated. A quoted post, a linked article and a belief on korrents.com are left in their original language.