Laptop RAM compatibility

[subhasis.tcs08]

Hello,

I have a lenovo laptop which has come with a 4gb RAM. I want to attach another 8gb RAM (making the whole system a 12gb RAM). I am checking my RAM configuration by an application CPU-Z. It is showing,

Type - DDR3
DRAM Freq - 798.1MHz.

Can I add 1600MHz RAM to my existing 800MHz RAM, or would it cause mismatch? Can I add Kingston 8gb PC3L 1600MHz Laptop RAM (https/www.amazon.in/Kingston-PC3L-1600MHz-Laptop-KVR16LS118/dp/B00CQ35HBQ/ref=sr_1_1?ie=UTF8&qid=1518679616&sr=8-1&keywords=laptop+ddr3+8gb+ram&refinements=p_89%3ATranscend%7CKingston) to my laptop?

 

[rgd1101]

use this to see what is compatible to your laptop
https/www.kingston.com/us/memory/desktop-notebook?ktc_campaign=US_Kingston_DRAM_Shop
http/www.crucial.com/usa/en/advisor?cm_re=top-nav-_-flyout-memory-_-us-memory-advisor