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Some ECC-enabled boards and processors are able to support unbuffered (unregistered) ECC, but will also work with non-ECC memory; system firmware enables ECC functionality if ECC memory is installed. ECC may lower memory performance by around 2–3 percent on some systems, depending on the application and implementation, due to the additional ...
When conventional memory is compared with registered memory, conventional memory is usually referred to as unbuffered memory or unregistered memory. When registered memory is manufactured as a dual in-line memory module (DIMM), it is called an RDIMM. Similarly, an unregistered DIMM is called a UDIMM or simply "DIMM".
Higher end version of 915. Supports another PAT-like mode and ECC memory, and exclusively uses DDR-II RAM. Sub-versions: 925XE - Supports a 1066 MT/s bus. 945P (Lakeport) Update on 915P, with support for Serial ATA II, RAID mode 5, an improved memory controller with support for DDR-II at 667 MHz and additional PCI Express lanes.
Two channels of unbuffered ECC and non-ECC DDR DIMMs (registered ECC is not supported) at 133 MHz, 166 MHz or 200 MHz (DDR-266/333/400) 66 MHz CSA interface for Gigabit LAN. MCH is connected to ICH via 66 MHz 8-bit (266 MT/s) Hub Interface v1.5. A 6300ESB ICH provides up to four 32-bit and/or 64-bit PCI-X at 33 or 66 MHz.
A memory rank is a set of DRAM chips connected to the same chip select, which are therefore accessed simultaneously. In practice all DRAM chips share all of the other command and control signals, and only the chip select pins for each rank are separate (the data pins are shared across ranks).
DDR4 SDRAM was released to the public market in Q2 2014, focusing on ECC memory, [6] while the non-ECC DDR4 modules became available in Q3 2014, accompanying the launch of Haswell-E processors that require DDR4 memory. [7]