High SP = good IMC ?!
If it is already not possible to infer DDR4 IMC quality from DDR5 and P and E cores are also independent of each other, can we at least infer the overall quality of the IMC from the overall quality of the cores? In order to be able to compare the tested clock potential with the SP value of the cores, I calculated makeshift “SP values” for DDR5 and DDR4 myself. The lowest measured clock rate is given a value of 50, the highest 100 and results in between a linear interpolated value.
Of course, this pseudo-SP for DDR4 and DDR5 is not really meaningful, firstly because the algorithm for the core-SP is likely to be much more complex and secondly because we are dealing with a relatively small number of cases here. But at least the values can be placed next to each other and it can be seen if there are interactions or if there is a CPU that can do everything well.
Here you have to click once and zoom in or trust my text. In addition to the “SP” values of DDR5 and DDR4, the SP value of the P cores of each CPU is now also listed here. The CPUs are again grouped by type and batch as at the beginning. And what can be read? In any case, no correlations between the “SP” values within a chip. The CPU with the best P-cores has below-average DDR4 and DDR5 values. The CPU with the best DDR5 IMC at least has slightly above-average rates in DDR4 and the P-cores. The CPUs with the best DDR4 values even always have at least average values for the P cores and DDR5, but of course this is not really reliable for 2 of 30 CPUs.
So what do we learn from this? Not nothing, but predictability also is not present. All tested components of a CPU are apparently independent of each other in terms of quality. P-cores, E-cores, DDR4-IMC, DDR5-IMC do not allow drawing any conclusions from their quality on each other. In addition, there is also the cache, which we haven’t even mentioned today, but which also has a clock/voltage lottery and possibly also the system agent, which is also responsible for the RAM, but also for the PCI-Express (5.0) communication.
So enthusiasts and overclockers in search of the golden CPU will have to reconsider how exactly they define “golden”. Alternatively, the search for a true Alder Lake all-rounder is likely to be far more exhausting and time-consuming than previously assumed in many forums. Finding a CPU that can do everything very well is like winning the lottery and the leakage is the bonus number – “Silicon lottery” is a very fitting description after all.
However, our search for a golden DDR5 IMC has taken a much more positive course. The CPU with 7650 Mbps at its peak in dual-channel has already almost cracked the 7900 Mbps at ambient temperature with a single module and is thus currently 15th in the world in terms of RAM clock. However, I’m still testing whether this can also be applied to daily overclocks and thus our RAM tests.
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