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More Memory

posted Apr 9, 2017, 5:22 PM by ms b0b
Ordered 8x 8GB PC3-12800 ECC registered and installed them in the virtualization server. Sounds simple, but it was not without drama.

First ordered the memory from one vendor around mid-March. The tracking info never got updated. Notified the vendor after the delivery window and promptly received refund. Too bad the courier dropped the ball, but the vendor made me whole.

Ordered the memory from a different vendor on April 4, received them on April 7. Nice.

Why 8GB modules? DDR3 ECC registered memory comes in 4 densities: 2GB, 4GB, 8GB and 16GB. PowerEdge R510s have 8 memory slots (4 per processor.)

2GB modules can't achieve meaningful total memory size so not even under consideration.

4GB modules are dirt cheap. About $5 per module if you look around. This density is fine for systems with lots of memory slots like R710, but a R510 can only have maximum of 32GB.

8GB modules cost about $20 per module, but I was able to find them at $15. R510 can achieve 64GB total memory which is more than I need for now. Consider 8GB unbuffered non-ECC DDR3 or DDR4 RAM for desktops are at about $50 to $60 per module, this is still a bargain.

16GB modules are too expensive. 

Now the lineup looks like:

Virtualization server
2x Xeon E5620 Quad Core 2.4GHz
8x 8GB DDR3 ECC Registered (64GB total)
ESXi 6.5

FreeNAS
1x Xeon E5630 Quad Core 2.53GHz
4x 2GB DDR3 ECC Registered (8GB total)
6x 2TB SATA HDD
1x 128GB SATA SSD for L2ARC
1x 64GB SATA SSD for ZIL

Spare R510
1x Xeon E5630 Quad Core 2.53GHz
4x 4GB DDR3 (16GB total)

Spare parts
4x 4GB DDR3 ECC Registered
2x 2TB NL-SAS HDD

To put the spare memory parts into service, I would need to get additional processor for the spare R510. Maybe I will do that next...

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