HP Probook 4540s upgrading RAM

Hi,
I would like to upgrade my memory (4GBs are not enough in theese days) for probook 4540s
Now, I have 1 module with theese specifications:
CPU-Z:
DIMM #                1
    SMBus address        0x52
    Memory type        DDR3
    Module format        SO-DIMM
    Manufacturer (ID)    Hyundai Electronics (AD000000000000000000)
    Size            4096 MBytes
    Max bandwidth        PC3-12800 (800 MHz)
    Part number        HMT351S6CFR8C-PB  
    Serial number         (Personal information removed)
    Manufacturing date    Week 38/Year 12
    Number of banks        8
    Nominal Voltage        1.50 Volts
Question is:
Can I add newer model to the second slot?
I want to buy:
HP SO-DIMM 4GB DDR3 1600 MHz Unbuffered
Certificated for PC3-12800 (B4U39AA)
It seems, the new model of ram module should be compatible with my notebook, but will be compatible with my old module, while working on 2x higher frequency?
Or I have to buy 2 new modules and  replace the old too?
Or I missed something and it is not compatible in any way?
Also, I have red at other forums, that upgrading memory up to supported 16GB takes some performance issues. Is it still ture, or is this already fixed?
Thanks for answer

Hi ,
The model supports the following specification of memory.
Standard
DDR3 PC3-10600 SDRAM (1333 MHz)
Two SODIMM slots supporting dual-channel memory.
2GB and 4GB SODIMMs
Maximum
Upgradeable to 8192MB with optional 4096MB SODIMMs in slots 1 and 2.
Dual-channel
Maximized dual-channel performance requires SODIMMs of the same size and speed in both memory slots.
Please find the link
http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c03349709&sp4ts.oid=5229455&lang=en&c...
http://www8.hp.com/h20195/v2/getpdf.aspx/c04126959​.pdf?ver=4
I'm an HP Employee.
The opinions expressed here are my personal opinions, not of HP.
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