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1 vs 2 processors in HP DL380P for Virtualization

Hello folks,

I'm trying to figure out which CPU configuration would give me the best performance and an HP server. All else being equal, would two 4 core 2.5 GHz processor be better than one 8 core 2.5 GHz processor in terms of overall performance? I am running six virtual machines using ESXI on this physical server host including two database servers doing lightweight database crunching. Thanks.
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JohnnyD74
Asked:
JohnnyD74
2 Solutions
 
RickEpnetCommented:
Everything else being equal I would opt for 2 physical CPU's

For Example I would have 2
HP DL380p Gen8 Intel® Xeon® E5-2637v2 (3.5GHz/4-core/15MB/130W) Processor Kit      715228-B21

Over a Single
HP DL380p Gen8 Intel® Xeon® E5-2667v2 (3.3GHz/8-core/25MB/130W) Processor Kit      715226-B21

Both these run at the same memory speed and have close to the same MHz.

You talked about 2.5 GHz CPU. In that range on the Gen 8 server there is a big difference in the 4 Core and the 8 Core 2.6 GHz. One run the memory at 1333MHz and the other run the memory at 1866Mhz. So there everything is not equal.

There is the matter of upgrade you have to think of too. It is much easier to upgrade a single CPU machine than a multi and cheaper too.

There are may factors you have to look at but I think over all I would rather have 2 4 Core over 1 8 core everything being equal.
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Paul SolovyovskyCommented:
2 CPUs period

The memory on the HP DL servers is balanced accordingly to CPU so you will only be limited in the number of memory you can place in the server.  If you reach a certain limit you would not only need to buy memory but the CPU kit as well which will cost you more in the long run as it may no longer be available readily

NOTE:
If only one processor is installed, only 12 DIMM slots are available.  Memory is usually the chokepoint and is cheap, get the 2 CPUs now and you don't have to worry later
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JohnnyD74Author Commented:
Thank so much Rick! The buget allows for the E5-2609v2 2.5GHz processor which as you said, runs the memory bus at 1333 MHz. If I were to upgrade to a processor with a 1600 MHz memory bus, like the 2.6 GHZ E5-2630v2, do you think it would make a big performance diffence for our SQL database app?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Purchase the server with the higher clock speeds.

We've just purchased servers with 10 Core E5-2697v2 3.0GHz, rather than the 12 Core, which is clocked lower!
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RickEpnetCommented:
A big difference NO. Would there be a difference yes.  
Your biggest boost for SQL would most likely come from how fast your disks are and what raid configuration you use.
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compdigit44Commented:
I have read article online stating that you should not allocate more vCPU to a VM than you have CPU Cores in the Host. Otherwise the VM would need to span the memory bank of another CPU... I believe it has to do with NUMA..

Just some food for thought
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RickEpnetCommented:
Always start with 1 CPU and if you need more add more but you can slow down VMs by adding too many vCPUs. If you can keep the amount of vCPUs on ALL your  VMs lower than your QTY logical processors you will be better off.
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