Z800: 4 GB module unbuffered

Can you take Z800 as 4 GB unbuffered module

http://www.Amazon.com/upgrade-workstation-PC3-10600E-unbuffered-parts-quick/DP/B00EV2SOH4

? What really limit 24GO of RAM ECC unbuffered?

Thank you

Short answer: that 4 GB unbuffered module is only supported with 1 DIMM per channel, i.e. 3 DIMMs per CPU (in the black connectors).  This means that each CPU has 3 x 4 GB = 12 GB, or 24 GB for 6 2 processors with 3 DIMMs per CPU.

Long why answer: each processor has 6 DIMM slots, but there are 3 channels of memory.  A black and white connector are matched on each channel.  Many signals are connected on both of these connectors.  Now, memory signal integrity decreases when several charges which is connected between them.  The module ECC you linked use coins 2 GB (from what I can see), so there are 16 memory chips, arranged in 2 rows (9 to the edge) and 9 on the back.  This means that this DIMM 2 loads (e.g., lines) on the channel memory.  If an identical DIMM is put into the same channel, there are now 4 charges on many signals, what is too much for the integrity of the signal is good.  That is why only 1 unbuffered DIMM per channel is permitted.

The way around this is to put a 'buffer' or 'save' on the DIMM.  Memory lines (called ranks) are behind this registry, the memory controller sees the 1 load the registry has the channel memory.  So, put in 2 DIMM in the two memory slots on one channel will only 2 electric charges (the same as your 1 DIMM Unbuffered), although there are 4 ranks of total memory.  Some DIMMs high capacity have 4 rows of each, but they use registers, so it has only 1 charge on the channel memory.  It's why registered memory is necessary for high memory capacity.  It is a restriction of integrity of electrical signal.

Is the DIMM you showed also warns against mixing DIMM Unbuffered and registered in the same system.  Yes, the system does not start with the joint memory.

Tags: HP Desktops

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