Comparison test of Alder Lake with DDR5 and DDR4

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Intel 12th generation Core processor Alder Lake supports both DDR5 and DDR4 memory. This kind of operation is very common during the transition of two generations of memory because the new memory basically faces the problem of shortage of supply and high price in the initial stage of the market. However, the mainstream market still has to rely on an old memory. Of course, the performance may not be so good if the old memory is used.

Now the Userbenchmark database already has Alder Lake running scores with DDR5 memory and DDR4 memory. Both of these results use 16-core, 24-thread processors. But the frequency is not the same. One may be Core i9-12900 and the other is Core i9-12900K. Of course, it may also be an unnamed ES processor used by a simple manufacturer for testing.The DDR5 platform uses two Micron DDR5-4800 8GB. The model is C8C1084S1UC48BAW. No specific information can be found, but most of Micron’s original memory is in line with JEDEC specifications, and their CL maybe 40. The DDR4 platform uses two HP OEM customized Kingston HyperX Fury DDR4-3200 8GB memory, and no information can be found. For the time being, it is assumed that it also complies with the JEDEC specification, CL22

The test results were unexpected. The read and write bandwidth of DDR5 memory with higher frequency is even lower than that of DDR4. The test results of DDR4-3200 memory latency are surprisingly high. The average latency of this set of memory in the Userbenchmark database is 75.2ns. The memory latency of this Alder Lake test sample is very high. It is estimated that we will have to wait for more samples to judge the specific situation.

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