Longsys shows what DDR5 is capable of
Thanks to an Alder Lake S processor, using the 12th Intel core generation, Longsys was able to present the first results of their RAM. Both DDR5 modules under development are of the DDR5-6400 type. The 16 GB variant comes in a single-rank design and the 32 GB in a dual-rank design. Furthermore, both have an eight-layer PCB, a CAS latency (CL) of 40 and 1.1 V of DRAM voltage. With DDR5, transfer rates of up to DDR5-8400 and up to 128 GB of memory per module should be possible.
In the AIDA64 Cache & Memory benchmark, the Chinese manufacturer pits a 32 GB DDR5 RAM against a 32 GB DDR4 RAM. The CL of the DDR5 bar is 40, that of the DDR4 bar 22. As a result, the latency in the test is also higher with DDR5 RAM than with DDR4. However, this is normal – the latency was also significantly higher at the beginning of the switch from DDR3 to DDR4.
|Longsys DDR5 32GB||Longsys DDR4 32GB||Difference (in per cent)|
|AIDA 64 Read||35844 MB/s||25770 MB/s||+39|
|AIDA 64 Write||32613 MB/s||23944 MB/s||+36|
|AIDA 64 Copy||28833 MB/s||25849 MB/s||+12|
|AIDA 64 Latency||112,1 ns||56,8 ns||+97|
The test ran on a developer board from Alder Lake-S. The eight-core processor operated with a fixed clock of 805.8 MHz during the test. The increase in performance is considerable at up to 39 per cent. However, latency is also significantly worse with DDR5: DDR4 memory reacts almost 100 per cent faster.
DDR5 should become accessible to a broad audience with Intel's Alder Lake S processors. They'll be out around late 2021 or early 2022. AMD hasn't yet announced anything about DDR5.