so I have a laptop with 4 gb ram embedded, and I have added 8 gb (dual channel) ram, so I have a laptop with 4 GB RAM embedded, and I have added 8 GB () RAM, in CPU-Z it says FSB: DRAM asynch, will that reduce the performance of my laptop??
and the 8 gb ram is dual chanel
You should check with the laptop maker support for upgrade paths on what add-in memory is compatible.
In asus website its say my laptop is compatible up to 12 gb
First all your RAM will run at the fastest speed of the slowest Ram installed. So if the 4GB RAM is slower than the 8GB Ram you installed all will run at the 4GB speed.
I believe that 4GB of the 8GB of RAM will run in Dual Channel with the laptop's embedded 4GB of RAM if they are compatible. That would leave 4 GB of RAM running in Single Channel.
As mentioned by another User you need to check to make sure the RAM you add is 100% compatible with the laptop's embedded 4GB RAM.
the ram I bought was a kingston fury impact 8 gb 2400mhz, and on the website it has a plug n play feature, and it has a plug n play feature, it should be suitable for my laptop
No you need to check your Laptop's Support site to find out which RAM is compatible with your laptop or google your laptop Model for RAM memory upgrade.
You will probably find links to RAM Manufacturers that shows compatible RAM for your specific laptop.
It not uncommon for the FSB:DRAM to be asynchronous, ie. not a 1:1 ratio with the CPU memory controller or uncore.
However the screenshot you posted shows the memory running at only 400MHz. When you captured that the laptop may have been in a low-power idle state? Try running a program load on the CPU and see if the number increases. If the memory is running at DDR4-2400 it should show 1200MHz DRAM Frequency.