When sourcing RAM, you must prioritize DDR generation (DDR4 vs DDR5) compatibility. For modern enterprise and gaming builds, DDR5 with speeds of 4800MHz to 6000MHz+ is the current standard, while DDR4 3200MHz remains the high-volume choice for budget-conscious markets. Ensure you verify CAS Latency (CL); lower latency improves performance. Additionally, confirm the capacity per module (8GB, 16GB, or 32GB) and whether the chips are Original (Samsung, SK Hynix, Micron) or third-party rebranded, as this significantly impacts stability and RMA rates.