Here is some info on the Zen processors. It may not answer all your questions but hopefully it will get you started...
See the section on mobile processors.
As far as your laptop is concerned, you will need to choose from the options that HP provides.
HP designs and builds their systems using proprietary motherboards and system BIOS. So there is not a lot of flexibility when it comes to upgrades and replacement parts.
Sorry arcticwind, this did not help, tried myself and here is my practical result:
Ryzen 5 2500U does indeed support 2x16GB DDR4 2400 CL16 on HP Envy x360 15 machine.
Upgraded 2x4GB Samsung 2400MHz CL17 to 2x16GB Balistix Sport (Crucial) 2400MHz CL16 and it works perfectly! Active 2400MHz frequency, dual channel and CL16 verified with CPU-Z and AIDA64 benchmark.
Did not try 2666 RAM as did not have one and got super deal at Saturn.de (58% off) for Balistix 2400 CL16 RAM.
PS. need to update Wikipedia page for Ryzen CPU RAM support.
Super happy with AMD and HP. Cheers!
That's great, I'm glad it worked for you.
Sense the RAM plays such a big part in the operation of the new Ryzen processors, it would be interesting to me if you could post the before and after benchmark numbers for comparison.
I'm interested in doing the same upgrade.
Do you know if the RAM you got was single or dual rank - the ram it comes with is single.
I'm running linux - I ran dmidecode, and it says the maximum supported ram is 16GB - (also that the numbers from dmidecode can be wrong).
Would it be possible to run a linux livecd, and see what dmidecode outputs ? I'm interested if it says the same, or if you've got a different version of the bios maybe ?
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HI, RAM is dual rank, AFAIK single rank 16GB DDR4 SODIMM modules do not exist.
Your RAM is single rank (as also was mine) as it is as little as 4GB per stick.
My RAM part number is BLS16G4S240FSD (Crucial Ballistix Sport LT).
I do not want to bother with DMI info as DMI is often not accurate.
I bought the exact same sticks of RAM and it is working in Ubuntu.
I made a quick post on /r/amd as more people should probably give it a go, it was a bit scary as it was over 300 quid to get the RAM. TBH if I knew 64 would work I would have considered it, I think it should work in theory.
I am interested in this as well.
AMD Ryzen™ Mobile Processors with Radeon™ Vega Graphics | AMD says that the top frequency is 2400MHz. But has anyone tested faster RAM, like say 2933MHz, supported by desktop Ryzen? The APU would certainly benefit from more bandwidth for gaming!