RDIMM and DIMM in the same server

Hallo all
I am about to buy Ram for "HP ProLiant DL360e Gen8 Entry - Server - Rack-Montage - 1U - zweiweg - 1 x Xeon E5-2403 / 1.8 GHz - RAM 4 GB - SATA - Hot-Swap 8.9 cm ( 3.5" ) -

However the dealer is telling me that He need to remove the RDIMM to be replaced by DIMM
According to HP documentation, there is space for 12 DIMM-space for RAM extension.

Hence my question is, given that there is a space for DIMM, if I buy an extra DIMM ram and extend the Memory capacity, will there be a problem with the existing RDIMM?
or It is okay to have both RAM in the Machine.?

Thanks for your Advice
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Gary CaseRetiredCommented:
It supports EITHER  unbuffered DIMMs or buffered RDIMMs or LRDIMMs => but NOT both at the same time.

It's better to use buffered modules, but less expensive to use unbuffered DIMMs ... so you need to choose which approach you want to take.
andyalderSaggar maker's bottom knockerCommented:
It clearly states in the quickspecs that you cannot mix types - http://h18000.www1.hp.com/products/quickspecs/productbulletin.html#spectype=north_america&type=html&docid=14327

It also lists all the standard models as having RDIMMs in them, so why not just get the dealer to supply more RDIMMs?
ZURINETAuthor Commented:
Hi all
Thanks for the input..
Which ram is then the best to choose from?
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andyalderSaggar maker's bottom knockerCommented:
Your CPU will only run the RAM at 1066MHz so anything faster will be clocked down to that speed, It comes with HP 4GB (1x4GB) Single Rank x4 PC3L-10600R (DDR3-1333) Registered CAS-9 Low Voltage Memory Kit 647893-B21 so I'd stick to that for the next 2 RDIMMs, then similar speed but larger for the second bank if you need more.

Note that you can only use 6 DIMMs if you do not fit the second processor, how much RAM do you want in total?
ZURINETAuthor Commented:
I need to have a max of 36 Ram
ZURINETAuthor Commented:
36 GB
ZURINETAuthor Commented:
I have already ordered a second processor:

This is what i need to order for the moment

- Intel Xeon E5-2403 - 1.8 GHz - 4 Kerne - 4 Threads - 10 MB
2 x - HP Midline - Festplatte - 1 TB - Hot-Swa p - 6.4 cm SFF (2.5
- HP ProLiant DL360e Gen8 Entry - Server - Rack-Montage - 1U

I am looking for the best cost saving ram to fit into this machine..
I.e 30 % 36 GB Ram
at 8GB per socket
andyalderSaggar maker's bottom knockerCommented:
I'd be tempted to get Kingston or Crucial clone RAM since it's much cheaper, the server will clock it down to 1066MHz since it's not HP certified but that's as fast as it will run it at anyway. http://www.kingston.com/en/memory/search?DeviceType=8&Mfr=HEW&Line=ProLiant&Model=78666
ZURINETAuthor Commented:
Hi Andy
If I decided to Use Kingston..
Do I need to remove the Ram the Server came with..
Or I can combine the 32GB + the 4GB Factory fitted Ram?

ZURINETAuthor Commented:
The price is interesting .. My buget is around $400,
Is there any alternative, with lower budget ?
andyalderSaggar maker's bottom knockerCommented:
16GB RDIMMs are cheaper than 2*8GB which is cheaper than 4*4GB, so on a budget I would buy

2 off KTH-PL316/16G       HP/Compaq16GB 1600MHz Reg ECC Module             £135.00 each
1 off KTH-PL313LVS/4G    4GB RDIMM to match current one                           £50

Then to populate remove the current 4GB DIMM and put a 16GB in its place and put the 4GB in the next white socket, and do the same on the other CPU. Total 40GB RAM. It's not recommended to have different RAM quantities on the CPUs, VMware would give an error complaining NUMA nodes don't match for example.

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andyalderSaggar maker's bottom knockerCommented:
Other option which your reseller was probably suggesting... remove the 4GB RDIMM and use UDIMMs vis:

4 * KTH-PL313E/8G       HP/Compaq 8GB 1333MHz ECC Module       £76.30 each
2 * KTH-PL313ES/2G HP/Compaq 2GB 1333MHz ECC Single Rank Module £25.00 each

I think that's more expensive though and certainly UDIMMs are slower than RDIMMs in most cases.
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