8GB vs 16GB RAM for Roblox and Minecraft: 8GB is fine for vanilla, 16GB helps only with heavy mods

Roblox and vanilla Minecraft run fine on 8GB of DDR3 with an i5-2400. The lag is usually from the CPU or integrated graphics, not RAM. Minecraft chugs only with heavy mod packs like All the Mods or RLCraft, where 16GB might help. Check task manager: if RAM is pegged at 7.5GB+ and CPU isn’t maxed, grab another 8GB stick; if CPU is pinned at 100%, more RAM won’t help.