AIDA64 Memory Bandwidth Benchmark Results for Kllisre dual-S2011 Motherboard. By Ian Mapleson (mapesdhs@yahoo.com) Last Change: 18/Dec/2019, 1014hrs. All memory speeds are at 1866MHz. All bandwidth numbers are in MB/sec. CPU configuration: 2x XEON E5 2640 2.8GHz The Handbrake test consists of converting a 1.1GB h264 1080p video with 25Mbit quality to 1080p x264 MP4 at 3Mbit (file size reduction to 120MB). Conversion test results are in frames per second. AIDA64 Bandwidth Handbrake Channel Mode READ WRITE COPY (FPS) (via CPU-Z) ------------------------------------------------------------------------ 8x 8GB (ALL SLOTS): 57207 45068 51524 42.2 Dual 4x 8GB (ORANGE ONLY): 56036 42710 47444 40.0 Dual 2x 8GB (ORANGE ONLY): 27825 22549 24569 34.4 Single Conclusions ^^^^^^^^^^^ In theory each CPU has 4 memory channels available, but only 2 from each CPU are used, ie. 4 slots are interleaved to two channels per CPU, hence the moderate bandwidth reduction due to the loss of interleaving when only using all the orange slots (losing real channels would result in a much larger reduction, as is seen when only using half the orange slots which imposes single channel mode). Thus, even with all slots filled, the motherboard is only providing half the potentially available memory bandwidth because half the channels from the CPUs are not used. This impacts performance for those who only partially fill the memory slots, but also means only half the bandwidth is available anyway compared to a properly wired board such as the ASUS Z9PE-D16. Applications such as Adobe After Effects would be especially affected by such a reduction in bandwidth. This issue can and should be solved by wiring the slots to entirely separate channels, ie. do not use interleaving. Until then, the motherboard should not be described as having 8-channel memory, because it doesn't; each CPU only has 2 channels, not 4. The motherboard has 4 total memory channels, not 8.