Can I upgrade my old laptop RAM like this?

[jin_hw]

The old laptop is T400, with motherboard type: Interl GM45, CPU:Intel P8700

Now I have 2*2GB(1066MHZ) RAM inserted in slots, but I am consider to upgrade to 2*4GB RAM, since the Maximum Memory per slot : 4GB

However, I also consider to purchase a new laptop, and I will upgrade my laptop to 2*8GB (1600MHZ) DDR3L.

So can I buy 2*8GB (1600MHZ) DDR3L RAM kit, and insert a 8GB 1600 DDR3L into a maximum 4GB supported RAM slot?

 

[ThatVietGuy]

No, I'm pretty sure your older laptop only supports DDR2 memory, meaning you can't install newer DDR3 memory.

 

[geofelt]

Go to a ram vendor web site like Kingston and access their ram upgrade app.
Enter your make and model, and you will get a list of supported ram upgrades.
The specs for T400 says Up to 8GB of PC2-8500 1066MHz DDR3

When buying laptops, I look for one with minimal ram and hard drive.
I then plan on upgrading ram myself and replacing the hard drive with a ssd. Higher factory specs are usually much more expensive.

 

[jin_hw]

No, I'm pretty sure your older laptop only supports DDR2 memory, meaning you can't install newer DDR3 memory.

Current I am using DDR3 but with 1066Mhz RAM