I Have 6gb Of Ram And I Still Lag?

On games such as Minecraft and Skyrim, I get lag spikes quite often. Especially on Skyrim. I don’t get it because my brother has 3gb of RAM and never lags on Minecraft but I do with 6.
Here are my specs:
Processor: Intel(R) Core(TM) i3-2310M CPU @ 2.10GHz
Installed memory (RAM): 6.00 GB
System type: 64-bit Operating System
Any help with this lag would be greatly appreciated:)

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