I am really wondering what are the pros vs cons of this 2 well known SoC makers.
Amlogic by the price of the boards seems like the clear winner in terms of price. Can someone tell me an aprox price of the RK3399 and the 922?
In your opinion what do you think is the biggest problem when it comes to Linux support.
Rockchip has 10-bit H264 support, lacking on all Amlogic devices.
RK3399 also has more display output ports and Linux support is generally better with already working open-source GPU drivers.
Rockchip Android Pie also supports HD Audio passthrough missing in most Amlogic devices.
Amlogic is generally cheaper and the latest S922x chipset is faster than RK3399.
But next year there will be a new RK3599 processor that will run a 4K UI compared to all devices that still run a 1080p UI, with only 4K video playback actually running in 4K.
The biggest problem for Linux is mainline kernel support for devices and the AP6398S wifi chip that has no mainline drivers, used by both Amlogic and Rockchip and other vendors.
If you use Linux - Rockchip RK3399 is better, if you only use Android then Amlogic S922x will be cheaper and faster. But Android software support is basically the same for both chipsets.
there you will also see that a311d supports Dolby vision, HDR10 +,except rare h264 10bit 30fps
Thanks so much mo for this detailed explanation.
So If I want mainline Linux I have to forget having WIFI? That is no bueno 
Do you know price difference? is it huge or just a tiny amount?
Thank Vladimir.
I have seen those benchmark before. But what I am trying to understand is where do they stand when it comes to developing something in Linux. I make applications in Wayland and I remember reading that they still don’t have a driver for that.
Khadas Edge-V Pro RK3399 and Khadas VIM 3 uses AP6398S which only work on 4.4 Linux kernel images for now.
Hopefully in future the wifi chip can be better support and then mainline Linux images can work with wifi. With mainline Linux you will have open-source working GPU acceleration for Linux based on the Panfrost/Bitfrost Mali drivers that are compatible with Rockchip(and I think Amlogic) but still wip.
But if you need wifi and can’t wait a few months until it’s available, it would be possible to buy a cheap Realtek wifi dongle and plug it into a USB port(of either Edge-V Pro or Vim3) but I’m not sure if extra steps are needed but most Realtek chips work well with mainline Linux.
The Khadas Edge-V RK3399 basic model uses AP6356 wifi for which there is currently mainline wifi support. You will most likely also need the IO board to use micro-sd cards to flash Linux images easily.
You will have to check on Khadas’s shop and all all the components you need to check the difference in price between Edge-V Basic/Pro and Vim3 and decide on the feautres you need for your situation.
I know about Linux very small and I will allow myself a comment. 
If you need Linux - choose RK (if possible, wait for the release of new models RK). If to compare kernels from manufacturers RK and AML - strongly would not advise to use that stuff which gives AML (with rough hacks after which the security system in a kernel is destroyed).
Thanks again mo!
I think I am a bit stupid 
I bought both VIM3 and Edge V but I took for granted that it has SD card reader.
Edge-V does have a microSD card reader.
The Edge does not have a card reader. An ext board adds microSD slot to the Edge. The Captain board also adds card slot.
Hi @pablomuniz
RDFTKV is right
The Khadas Edge-V model does have a micro-sd card reader.
Khadas told me previously you also needed the IO extension board for the V model to use micro-sd but they might have been mistaken.
It’s confusing since if you use the casing and put in the HDMI cable you might miss to notice it.
Here is a picture, it’s located at the top middle on the bottom side of the board.
This form factor is shared with the VIM, VIM2 and VIM3. It is where the -V in Edge-V comes from.
It can be difficult to access the slot when the HDMI cable is connected. A few of us picked up some of these microSD card extenders to use on the original VIM. Comes in handy if you do a lot of card swapping.
Never mind I had a looong week.
Just ordered Edge V 
Will check if it runs better than VIM1, VIM2 and VIM3. I’m very positive about Rockchip since Geekbox (pre-Khadas device) - it used to run video very smooth. Though I used it mainly with Android 6, therefore very curious to build Ubuntu for Rockchip.
Well i have both the Edge-V and the newer A311D board and i think the 311D looks better
I was wanting to get another one but was stumped on which to get one of the 905 boards or the 912
The 905X is a 2.0G quad core with mali 450, the 905D is 1.9G with a quad core and the Mali G3 shouldnt the 1.5G octa core (912) out perform both 905s?
@BowerR64
S905X/S905D/S912 are all actually 1.5Ghz not 2Ghz, Amlogic cheated the bootloader values reported.
It is very unfair of Amlogic to this to us, On paper they seem so powerful and cheap for the price but in reality they just Ripped us off. 
I think he meant 905x3, 4 cores of 1.9
No I checked some of the Forums, the Chip is being throttled back to 1.5 GHz instead of the advertised 1.9GHz you have to modify some things to Achieve that Frequency. HardKernel has however been able to Achieve Overclock and some other things on that Chip
I have a few of the cheaper Android boxes a couple 905X2 and a couple 905X3, then i have an H6 Allwinner, and aS912 i actually think the S912 has a better image then the others.
Ive seen the benchmarks and everything but imo the 905 units look grainier but they are faster, the S912 looks cleaner the lines look smoother to my eye then the 2 905 versions but the 912 is slightly slower
But they arnt the Khadas units so its hard to say if they will be the same as the cheaper chinese android boxes i have
maybe depends on quality control? for example, Khadas vim3 has honest 2.2 Ghz, unlike other manufacturers
In this regard, there was a lot of controversy where instead of 2.2, it was 1.7, and all manufacturers unanimously blamed Amlogic, one wonders, where were their eyes? 
