AMD Pro 4650G workhorse: Meet PharLap

It is always hard to come up with a system with cutting edge components without the accompanying problems and showstoppers. So this page can help you (and me), I hope you like it. This is in particular true for Linux users where unsupported hardware can be a nasty disappointment.

This page is pre published in order to process your input. So feel free to leave a much appreciated comment, below or here.


Before explaining why these specific components were chosen, here is a listing. One stop shopping was performed at (for Belgium and Dutch readers):

Courtesy Andrew, The MURDER of Phar Lap. (wikimedia-link)


You may ask yourself why to choose those components, so here is an explanation:

  • About the CPU:
    • The base is Xubuntu. I often work with virtual machines (VirtualBox) for development, like Windwows 10. Having enough cores and performance is a must. AMD 4650G offers that.
    • I also do use BricsCAD and most CAD applications rely heavily on single thread performance. AMD 4650G offers that too.
A close look reveals why someone coined the term “multithreading” – It really is a jumble of yarn!
  • First of all, we recently started to use Asrock A300 systems with AMD Ryzen 5 3400G inside. They perform far beyond expectations. So, following the Ryzen abcdG APU path is obvious.
A300: Very small, very powerful
  • Price performance ratio is an argument. It is about trying to find a balance without going too fancy, getting it over dimensioned and without shooting your legs because it doesn’t fulfil the needs. It also means trying to stick to Asrock’s QVL’s.
  • The bulky bastard hard disk is needed for running rsnapshot, I use this machine to have an extra – extra back-up of our servers and in case of remote, off grid, operations I can get to our data. WD Gold series turned out to be fast and reliable over the past years.
  • Why Asrock? Many years ago I was fed up with not getting proper support (Asus, hope it is better these days) so we changed to and standardized on Asrock. When you really run into serious trouble, they take their responsibility – although it can take some time and you may have to push a bit. So far, I am very happy with them.
  • The motherboard Asrock B550M-ITX does mention AMD 4650G and Kingston HX432C16PB3 in the QVL and has an attractive price. All in all a balanced, tested and reliable mix.
  • Cherry Stream – favourite – was not available, so Cherry Strait is an adventure. And about the mouse: After using the model for so many years my hand can’t handle any other shape anymore. Very personal and yes, all is wired too.

Caveats, do’s and dont’s

These listed points are discussed in detail later on.

  • DDR4 memory modules are not properly recognized by the motherboard. While on the QVL, 2400 MHz was detected instead of 3200 MHz.
  • The standard AMD Wraith CPU cooler interferes slightly with the memory modules. Finally I removed some of the plastic. The Noctua NH-L9a-AM4 is a better, but more expensive, choice.
  • (X)ubuntu 20.10 returned kernel panics after presenting GRUB with a normal boot menu without offering options “try” or “install”.
  • Xubuntu 20.04 left the system in a semi frozen state after an inactivity period.
  • Xubuntu 20.04 fresh install left me with a not active sound card.
  • Missing USB cable for the motherboard.



General verdict: Above expectations in general. Proper price performance ratio. Highly recommended for general purposes, virtual machines. CAD performance is poor so far. Not sure what the cause of this is, working on that.

Fans: I found the AMD Stealth sound becoming annoying in time, it sounds like a humming transformer. The difference between the AMD Wraith Stealth and the Noctua NH-L9a-AM4 is day and night. Noctua NH-L9a-AM4 is much more silent without the irritating hum. The only drawback is its price tag and, in a far from your ears solution, Wraith Stealth does a proper job for a nice price.

Xubuntu: I did not manage to install Xubuntu 20.10. However, 20.04 does a great job, after solving the unresponsive keyboard and mouse issues. It is (as)rock solid. It is not a system without glitches but they all turned out to be solvable. It is a fast workhorse. In fact, I changed its name (/etc/hostname) to PharLap, so that you know!

Keyboards: Cherry makes fine instruments. My wife took possession over the Cherry Strait and loves it. Personally, Cherry Stream stays favourite. The reason for that is the standard lay out. Cherry Strait has a non standard area for insert|delete|home|end|page up|page down and despite trying, I couldn’t get used to it quickly.

USB connectors

In the manual is states:

There is one header on this motherboard. This USB 3.2 Gen1 header can support two ports.

Now, I need a cable… On reddit someone says:

You can thank the USB-IF standards body for that. They’ve made a complete mess of the naming
* USB 3.0 == USB 3.1 gen 1 == USB 3.2 gen 1
* USB 3.1 == USB 3.1 gen 2 == USB 3.2 gen 2
The connectors are Type A or Type C and can be used with any USB speed / version.
* Type A connectors are the traditional connectors that you know and love.
* Type C connectors are the new reversible connectors
Just because there is a Type C plug on a computer doesn’t mean it’s got a USB 3.2 gen 2 port.
The preferred consumer names from the USB-IF are actually SuperSpeed USB and SuperSpeed USB 10 Gbps. But nobody is following their direction.

Good to know, let’s find a cable from motherboard to front panel. Well, it turned out to be not too hard, just search for “USB 3.0 cable motherboard” on Chinese sites to get great offers. This came in:

USB 3.1 gen 1 connector cable…

And they are available in other configurations like brackets.

Installing Linux

Installing Xubuntu 20.10

This turned out to be NOT working, but for reference it is documented…

Where is “Startup Disk Creator” when you need one? Gone to oblivion? No, see next heading. So another approach after downloading Xubuntu… 20.10!

Put a USB stick in and ctrl-alt-t in order to find it…

sudo fdisk -l
Disk /dev/sdx: 7,25 GiB, 7776239616 bytes, 15187968 sectors
Disk model: DataTraveler G3 

Next, if you don’d have ddrescue, do apt install gddrescue on Ubuntu. Started in the directory where the iso lives and creating it on stick /dev/sdx – see output fdisk for your stick.

sudo ddrescue xubuntu-20.10-desktop-amd64.iso /dev/sdx --force -D

After finishing, you’re ready for the next step.

Well, not quite! Xubuntu 20.10 was a bad experience. Several attempts left the system with a kernel panic. Bummer! Sayonara Xubuntu 20.10!

Question: Is this smart? I.e. using ddrescue? synaptec searching for usb-creator is an option… More on that, if you have an opinion, please leave a comment. See

Installing Xubuntu 20.04

In the mean time, I found “Startup Disk Creator”. Turns out to be an alias, so if you can’t find it: apt install usb-creator-gtk first. A boot stick with an ISO of Xubuntu was a piece of cake, boot with the stick, press F11 after the keyboard LED flashes, more cake.


Not being used to UEFI, that still is a bit strange. What I did and in this order:

  • GPT partition table
    • ESP (EFI System Partition): 0.2% ~ 2 000 MB. Is less a penny wise and a pound foolish?
    • EXT4 for /: 800 000 MB
    • SWAP: 32 000 MB
    • Not partitioned for emergency OS and so on: ~ 150 000 MB

No sound!

No sound, there is always something… pacmd list-cards offers an overview of all “cards” and both HDMI and onboard card resulted in: active profile: <off>. Bad news. Probably not necessary, but I plugged in some headphones, did sudo apt-get remove --purge pulseaudio and then sudo apt-get install pulseaudio, rebooted and I had the onboard audio working. Strange!

Solving mouse and keyboard semi frozen state

Mouse and keyboard work while you are busy. Then you grep a cup of coffee and find out the mouse pointer moves, but no click events from either mouse or keyboard arive. However you can do Ctrl-Alt-F1 and do your thing. Turning back with Ctrl-Alt-F7 and the problem is back. Pretty frustrating!

Finally, I removed the screensaver, when I leave my work space I turn off my monitor (and the lights).

Solutions are described on Askubuntu (if you need a screensaver go there) and the Xubuntu maillinglist. These are the steps I took:

sudo apt remove xfce4-screensaver

Next, disable start on login of xfce4-screensaver: In Xubuntu it is:
Whisker > Settings > Session and Startup > [] Screensaver (launch screensaver and locker program)

Then, Whisker > Settings > Power Manager > Tab Display > Display power management > ON (Yes, not OFF!) > move sliders to “Never”.


xfce4-screensaver-command --exit

All kind of other installing stuff

I’ve written step by step instructions here, you may want to start at page 1:

AMD fan interferes with HyperX modules

Although not much, the fan housing hit the RAM module. In order to maintain proper contact of RAM in the slot, I removed some plastic from the fan housing. On top of that, I did not want it to start resonating.

The solution is easy, see the picture:

Sanding one side of the fan housing…

In addition, cleaning the aluminium with isopropanol and adding new thermal paste is necessary.

BIOS assigns inferior speed to Kingston RAM

The HyperX Kinston modules are 3600 MHz and the BIOS recognized them as 2400 MHz – or so it seems. I’ve changed that manually in the BIOS: B550M-ITX/ac P1.00.

So it turns out to be 2400 MHz RAM, verified for overclocking to 3600 MHz by Kingston. See comments, I can live with that, no issues after several months of stability. However, really confusing and annoying!!

WD Gold drive

With so many drives out there, it is hard to choose. As explained, this drive is used for running rsnapshot. The previous drive did its job for a relative short time but simply became to small. So it was time to go from 8 TB to 16 TB. We have quite a few WD Gold drives in the field and so far, no problems at all. This is the product sheet.

However, I was asking myself if it might be reasonable to just do the daily back-up and than power down in between. Well, people running servers will always advice against this – never stop a running disk drive. To a certain extent I agree, experience shows drives running for a decade and refusing duty after one stop and start. But modern drives? So I asked WD support.

You shouldn’t be worried, especially on such low usage case scenario. Of course, we cannot know for sure as there might be many factors that influence the life spam of a drive, read and write cycles, correct power supply, environment etc.. but if everything is under normal conditions, WD Gold drives are designed for a lot of usage.

So it seems save to say a once a day on and off cycle wouldn’t harm.

But then again, why take the trouble? Rule of thumb: Every 1 Watt costs 2€ per year. So 5 years 5 W is 50€. Hardly an argument considering the price of the disk is a tenfold.

Some additional notes: The drive is fast indeed, from NVM to SDA I clocked speeds exceeding 200 MB/s by far. On top of that, it is not a noisy drive.


A working solution… but homeless!

More later!

8 thoughts on “AMD Pro 4650G workhorse: Meet PharLap”

  1. Hi. Thanks for the post!

    Did you have any issues with the integrated graphics of the 4650G? I’m considering it for Linux, but I’m not sure it’s properly supported and I haven’t seen many comments online about it.


    • I am happy with the graphics, except for BricsCAD. 2D works great but 3D and not in wireframe mode it is a bit slow, sticky. All mainstream things work fine and I did an out of the box Xubuntu 20.04 install. No issues so far. What Linux taste do you have in mind? It would be nice to post about it for other visitors.

      • Thanks for the reply!

        I’m going to try and install Manjaro Gnome on a MSI B550M PRO-VDH WIFI motherboard with a 4650G and no discrete graphics card (because right now it’s impossible to find a Radeon at a decent price, or at all). Let’s see how that goes when I receive the hardware.

        Happy new year!

  2. Same CPU here, ASRock a520m pro4, Ubuntu unity 21.04. sound CHECK! mouse/kb check. Kernel 5.8 no issues whatsoever. Your memory IS 2400, and Kingston verified it to be working ovwrclocked to 3600. Enable XMP memory profile in bios, to enable that k

    • Thanks! That explains a lot. I don’t think I changed XMP, I can’t look at it right now while writing this 🙂 System is running day and night without any crash.

      Update… See picture above, XMP does not support 3600 MHz RAM but setting it manually is an option. And good to know that updated Linux distro’s work as well!

  3. Hi!
    I am planning new build with Ryzen 5 4650G and ASRock B550M-ITX/ac motherboard and can not find information about dual monitor setup.
    For OS I will be using Ubuntu or Pop!_OS.
    Have you tested your build with two monitors (one connected with DP and second with HDMI)?
    What is maximum resolution for two monitors? 3840×2160 for both (1920×1080 each) or 3840×2160 each?

    Thank you for any information!

      • DP monitor is not detected when plugged in. Booting only from DP works, but in low resolution. Perhaps there is some other issue here. xrandr -q shows only HDMI while DP is plugged in. Strange. Sorry, worth trying, but without a clear answer.


Leave a comment