New cost-effective DDR5 memory 'HUDIMMs' show around 50% reduction in throughput with single subchannel — Two HUDIMMs are as fast as a single stick of regular DDR5 RAM

The article discusses the introduction of cost-effective DDR5 memory called "HUDIMMs," which utilize a single 32-bit subchannel instead of the traditional 64-bit wide bus. Testing conducted by HKEPC and Asus revealed that HUDIMMs experience a nearly 50% reduction in bandwidth, significantly impacting performance. By simulating HUDIMM on standard DDR5 RAM, the study demonstrated a notable decrease in read, write, and copy speeds compared to regular DDR5 RAM. While HUDIMMs offer cheaper alternatives with fewer ICs per stick, the trade-off is a substantial performance hit, especially in dual-channel setups. Additionally, the article mentions the potential performance benefits of combining HUDIMM with regular DDR5 in asymmetric dual channel support configurations.