RAM needs depend heavily on the modpack size:
Lite Packs: 4–6 GB
Medium Packs (e.g., Better MC): 6–8 GB
Heavy Packs (e.g., ATM, All The Mods, SevTech): 10–12 GB+
If you experience "Out of Memory" crashes, you likely need an upgrade.
If you need help with this, please submit a ticket.