You can find your PC's RAM information directly from Windows task manager (Windows 10 only) or using programs like Speccy.

We can determine the RAM type (DDR2, DDR3...) without any additional software, directly from Windows command line with this command:

wmic MemoryChip get BankLabel, Capacity, MemoryType, TypeDetail, Speed, Manufacturer

This will show something like this:

BankLabel Capacity Manufacturer MemoryType Speed TypeDetail
BANK 3 8589934592 Kingston 24 1866 128

We should pay attention to the MemoryType, this one show our RAM type:

• 20: DDR
• 21: DDR2
• 24: DDR3

Other useful information from this command:

• BankLabel: Motherboard bank where the RAM module is installed.
• Capacity: RAM capacity in bytes.
• Manufacturer: Memory manufacturer.
• Speed: RAM speed in MHz.

For more information: MSDN

If we couldn't determine our RAM type neither from command line nor Speccy, and it's a laptop, is highly likely that the RAM is soldered to the motherboard and you won't be able to upgrade it.