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Analysis
DDR5-8000 against DDR5-6000 — is faster memory worth it
A higher number on the box does not always mean a faster machine. We explain where the returns stop, and why on Ryzen the boundary is unusually sharp.
1 min readPublished May 18, 2026Dawid Olko
DDR5 sells today in a range from 4800 to over 9000 MT/s, and the price difference between the ends of that range can be threefold. The question is where the real gain stops.
Nanoseconds matter, not megatransfers
CAS latency is given in clock cycles, not in time. A DDR5-6000 CL30 kit and a DDR5-8000 CL40 kit have identical first-word latency: 10 nanoseconds. The faster kit offers more bandwidth but no less latency — and most games respond to the latter.
The hard boundary on Ryzen
On Ryzen processors the memory controller runs synchronously with the memory up to a certain frequency, and above it drops into a divided mode. Past that threshold performance can fall despite the higher numbers on the module. For Ryzen 7000 and 9000 the threshold usually sits between 6000 and 6400 MT/s.
On Intel the situation differs: the controller handles higher frequencies and faster memory does give a real, if still small, gain there. We are talking about a few per cent in CPU-limited games and effectively nothing at 4K.