after I searched a lot of info on the internet and also I ventured to look directly at my laptop, by opening the laptop body very carefully. I found that Lenovo Ideapad 100 14ibd has 1 RAM onboard and 1 RAM slot that is still empty.
I see that the RAM G slot has DDR3 1.5v 4.0G. I conclude that this is a sign that this ram slot uses DDR3 type with max 1.5-volt electric voltage. that means I can install DDR3 or DDR3L (1.35v).
and I believe that the maximum RAM that can be used is only up to 4GB.
So the first trial I bought ram with was DDR3L 12800-1600mhz 2GB.
And after I installed it worked.
Ram which was originally 2GB onboard, has now changed to 4GB.
My laptop feels very fast and light.
The following are the specifications of the Lenovo Ideapad 100-14IBD laptop:
Processor: Intel Core i3-5005U CPU 2.00GHz
RAM: DDR3 2 GB Pc3L 12800
Hard disk: 500 GB HDD
Camera: 1,3-megapixel webcam
Battery: 4 Cell Li-ion, 2200 mAh
VGA : Intel HD Graphics 5500 + NVIDIA GeForce 920MX (2 GB), Dedicated 128, Shared 2004 MB, Up to 2132 MB
screen: 14,0 HD LED LCD
Operation System (OS): Windows 10 Home Single Language 64-Bit
Fitur: Webcam, Cardreader, 2 Port USB, HDMI, Realtek RTL8723BE Wireless LAN 802.11n PCI-E NIC, Realtek PCIe GBE Family Controller, DVD Super Multi DL Drive, Bluetooth