Vaio Fit 15A - Upgrading RAM to 1866HMz or 2133MHz

Hi,

I have a Sony Vaio Fit 15A with i7-4500u CPU and 1 bar of 8GB 1600MHz DDR3L RAM.
Can I upgrade my RAM to 2x 8GB 1866HMz or 2133MHz?

Will Vaio support these frequencies or will the frequencies just be downclocked to 1600MHz?

Thanks!