дак может прирост не от 4 планок а от двуранговой памяти?)
This is important to note because in the tests we’ve seen all memory used has been single-ranked modules. So when using two single ranked modules for dual-channel operation, the memory is configured as a single rank. However, when using four single rank modules for dual-channel operation, the memory is now configured as a dual-rank.
вот цитата из текстового варианта этого теста