DDR4 has been around for more than six years now so it will be interesting to see what the new memory standard brings to the table. VideoCardz noticed Chinese memory maker Longsys published test results of an Alder Lake-S system with DDR5-4800 memory. The firm tested a single-rank and a dual-rank (both x8) module. The former with 16GB memory capacity, the latter with 32GB capacity. Both models ran at 4800MHz with CL40-40-40-77 timings.
The memory was tested in combination with an eight-core 12th Gen Core engineering sample running at a mere 800MHz. In terms of performance, DDR5 seems to pack quite an uplift in memory tests. Latency of the initial chips is a lot higher though:
According to Longsys tests, the DDR5-4800 MHz memory scored 53% higher than DDR4 memory (likely 4800 MHz kit as well) in the Chinese PC testing tool called Ludashi (memory test). In AIDA64 the read speed has increased by 28% and write speeds are 27% higher. Higher bandwidth comes at a cost of higher latency, which has almost doubled from 56.8ns on DDR4 memory to 112.1 ns ton DDR5.It's believed Alder Lake will support both DDR4 and DDR5, which will give consumers more options until DDR5 is widespread enough.