Half Life 2 is far from the most demanding game out there.. Its well coded and made, so thus it doesnt require alot of RAM on the regular settings. People have made hi-res packs like Fakefactory I think has one out that runs models and some textures and objects at 2048x2048.. Download that if you want to use up all your RAM
. (Friends system with a unlocked + OC'ed 6800 Pentium 4 2.8 and 1.5 gb of RAM lagged in areas).
If you want to force HL2 into using all your 400mb RAM, then go to the Game Properties (in Steam game section) and Right click, Properties, then Set Launch Options. Type in "-heapsize 400000" in it without the quotes and apply. Now it should be using all of your RAM.
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