We use CloudLinux on our servers and set resource limits with each hosting account/plan. The following are our current limits:
Starter
CPU = 2 Cores (200%)
RAM (Physical Memory) = 4 GB
NVMe Storage = 250 GB
I/O (MB/sec) = No Cap
IOPs = No Cap
Inodes = Unlimited
Entry Processes (EP) = 200
Total Processes = 400
Bandwidth = Unmetered
Advanced
CPU = 4 Cores (400%)
RAM (Physical Memory) = 8 GB
NVMe Storage = 500 GB
I/O (MB/sec) = No Cap
IOPs = No Cap
Inodes = Unlimited
Entry Processes (EP) = 400
Total Processes = 800
Bandwidth = Unmetered
Pro
CPU = 6 Cores (600%)
RAM (Physical Memory) = 16 GB
NVMe Storage = 1000 GB
I/O (MB/sec) = No Cap
IOPs = No Cap
Inodes = Unlimited
Entry Processes (EP) = 600
Total Processes = 1200
Bandwidth = Unmetered