The data of the test system …
| Motherboard | ASRock B850 Steel Legend Wifi |
| CPU | AMD Ryzen 7 7800X3D 8 Kerne, 16 Threads 1 Core Complex Die (CCD) |
| RAM | Crucial Pro Overclocking 2x32GB DDR5-6400 |
| M.2 SSD | Crucial P5 Plus 1TB PCIe Gen 4 |
| PSU | Seasonic Prime TX 1300 ATX3.0 |
The ASRock B850 Steel Legend AM5 motherboard offers 4 RAM slots, 2 of which are equipped with the two 32GB DDR5 memory modules. As a result, the RAM works in fast dual-channel mode and the two single-rank modules do not place a particularly high load on the memory controller integrated in the AMD Ryzen 7 7800X3D processor. Here you can see the single-sided PCB of the new 32GB memory module from Crucial.
Ryzen 7000 and 9000 processors have the same integrated memory controller and the 6- and 8-core variants only have a single Infinity Fabric, which forms the connection between the IO die and memory controller and the CPU cores. CPU variants with 12 and 16 cores have 2 CCDs and have one Infinity Fabric per CCD and can therefore achieve higher transfer rates between the RAM and the CPU cores. We will reveal later whether we will achieve the maximum transfer rate of the single IF of our Ryzen 7800X3D in the following overclocking tests 😉
If the RAM is optimized and overclocked, you should be sure that the processor is stable. You should reduce the overclocking of the processor (including high Curve Optimizer values) in order to rule out an unstable CPU during the tests. We recommend Prime95 Large FFT, Y-Cruncher and HCI Memtest as stress tests for memory optimization. TM5, Karhu and similar programs can also be used. CPU tests such as Cinebench or Prime95 Small FFT, on the other hand, are not suitable for testing the RAM for stability.
XPM and EXPO Profile Benchmark Test Results …