What do I have to look out for when I buy new RAM for my laptop?

I have 2x 1GB inside my old laptop. Can I simply install 2x 2GB jz, or do I have to pay attention to something?

The data sheets of your laptop should indicate how much RAM it can be upgraded to. There you can also find out which properties the modules must have.

Basically there are different factors that influence what exactly RAM you can use. If you tell me which model it is, I will be happy to write you the specifications.

Fujitsu Siemens AMILO PRO V3405

For now. 2GB Ram are of course critical today, back then that was still sufficient. However, I would wait to buy the ram during Corona times, because both the prices on the used market and the new prices at Amazon have skyrocketed, since everyone with home schooling and home office thinks they need a new Ram, etc. It's your choice, but I'd wait a bit for the easing to come and then look for Ram

Here as an example for your RAM request

https://www.compuram.de/arbeitsspeicher/fujitsu-siemens/notebook/amilo-pro/serie/v3405/

Please note that your notebook only has 32bit OS and 4GB are not fully supported (example T2050 CPU)

So,

your RAM must be DDR2 SRAM. It is also pointless if the clock frequency is above 533 MHz because your CPU no longer supports it and it should not be more than 4GB because that is the maximum addressable memory size. The DIM size is also important because the same RAM can't be installed in laptops as in normal computers. This is called SODIMM on laptops.

So just look for "dualchannel ddr2 4gb 533MHz SODIMM".

I've already picked out a suitable product for you if it helps you to find other products:

https://www.amazon.de/...B004LT8LPC

I would also recommend you to buy a "new laptop" because I think that a RAM upgrade will hardly be of any use in this case. Laptops can also be bought second-hand.

So if you have 4GB of RAM instead of 2GB, won't the laptop get faster?

Well the RAM has to fit your notebook.

If you now have 2x 1GB then I suspect that it is neither DDR3 nor DDR4 memory, which means your notebook must be quite old.

So you should first determine what type of memory you need and whether it is even available as a 2GB module (because with DDR1 memory there may be no 2GB modules at all).

Then you should find out whether you can change both modules at all, with some notebooks there's only one RAM bank to change, and the other memory is firmly soldered.

Also ask yourself whether an upgrade is worthwhile, because the rest of your hardware stays the same and doesn't get any faster.

Sometimes a new purchase with more up-to-date hardware could be the better alternative. There are also many dealers who trade in used hardware (reconditioned devices from leasing returns). Especially if the new device has an SSD, it speeds up the booting and loading of programs immensely.

https://www.gebrauchtcomputer24.de/notebooks/lenovo-thinkpad-x240-ssd-4642.html

You do not have 4GB of RAM, even if you buy it, because your system does not have 64bit support and therefore can't address a full 4GB.

With 32 bit you can address a maximum of 2 ^ 32 = 4294967296 or 4 GB (through 1024) memory addresses. Where does it not support 4GB? And yes, I think it doesn't make a big difference because the RAM is not the bottleneck (weakest link).

Its notebook architecture only allows 3.75 GiB RAM.

Anyway, don't make the cabbage fat anyway.