( Tried installing in all slots also tried schemes that writen in service manual ) DDR specs GoodRam GYG1600D364L9s/7gds full working Ram specs ( now installed )2gb 1Rx8 PC3-12800e-11-11-D1 M391B5773D. I have read that registered memory was a crutch to quicken the pace of technology (more capacity/channels) at the time for the cost of performance and power consumption. I'm trying to intall to my hp-z420 two ddr3 4gb pc3-12800 dimm of ROM. My work station circa 2011 takes ECC "E" (unbuffered at the time) and my server circa 2006 takes ECC "F" or fully buffered, which then for a time was labeled "R". You usually cannot mix them, but sometimes enterprise server boards can accept both with "R" usually allowing more installable memory capacity I think.įurther there was/is? a "U" which is unbuffered non-ECC. Product Description: 4GB DDR3-1600 ECC Unbuffered DIMM CL11 1Rx8 1.5V Intel Certified. They both are ECC, but they both are NOT registered. To extrapolate, the "E" memory does not have the additional registers and is unbuffered. Sometimes registered memory is called buffered memory. As pointed out in the comments, the "R" memory is registered which "means it has additional buffers".
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