2x AMD 16 Core Vs 2x Intel 6 Core for use with VMware ESXi VCenter

As Above..
I am looking at a DL385 Dual 16 Core AMD Cpu Machine like this..


I have been told that 6 core intel cpu have better PassMark rating than a 16 core making them better cpu's?

I dont entirely understand as the Cache, No of Cores and Clock Speed is greater on the AMD?

HP also have free additional CPU on there new G8 range so was wonder wether i would be better going with intel? However i am still currently swayed to the huge amount of cores on offer with the AMD?

Could anyone shed any light on this?

is PassMark totally relevant?

Are there any other better Servers i should be looking at within the price range and also and have direct report comparting these or similar processors also with use of VMware with these products.

Once again.. many, many thanks in advance.

So many questions i have asked regarding our new server purchase but we are getting close and nearly there just making few final decisions.

Kind Regards,
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
think of the future, will you be adding any more servers in a cluster in the future?

and what deals will be on then, if you start with Intel, you must continue with Intel, because mixed CPU Vendors do not work well.

Personally, we've always used AMD Processors for VMware Virtualisation. We find, at the top end, higher utilization can be achieved in using AMD! (90-98%)!
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What will make the difference, is CPU is never the bottleneck, whether 16 Cores or 6 Cores, we design servers and infrastrcuture around 5-6 VMs per Core, and the memory and storage is often the bottlneck.

With new ESXi licensing in place, what are you licensed for?

How much memory per server?
Nagendra Pratap SinghCommented:
I think you are confusing Vcenter with Vsphere.

Vcenter is the management program. 2 GB with medium CPU usage is OK for Vcenter. In fact even if it goes down, esx/esxi keep doing their work.
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Choosing your CPU vendor is really important when you are going to use vSphere. If you select AMD or Intel the next other systems that will be member of the cluster (if that is your plan) will need to be from the same vendor. Another thing is that the CPU needs to support virtualization technology.
Regarding number of Cores, more cores means more processing power. But as was said before you also will need a decent amount of memory (RAM) on the server. The rule of thumb that i use when i design a vSphere environmental for CPU/vCPU relationship is from 4 to 6 Virtual Machines per cpu core. But all this is flexible depending the workload that will run the vms, for example: it's not the same amount of resources need by a Windows XP machine that the need by one running  Windows 2008 + Exchange. My two cents.


MPJHornerAuthor Commented:
Thanks for the suggestions.

I was more asking how a similarly priced intel 6 core CPU and a 16 Core AMD CPU compare with use of vSphere?

The PassMark test states the 6 core intel (even though less cores) is more powerful?

Though in relatity would i be better off just with more cores?
CallandorConnect With a Mentor Commented:
When comparing Intel with AMD, Intel has the higher performance cpus, while AMD has the edge in the value arena.  If all things are equal, more cores and higher clock speed equate to more performance, but in this case, all things are not equal.  Intel cpus get more work done per cpu cycle, due to their architecture design, so the Passmark rating is valid.  Even within Intel, you have to be aware of different cpu families, because the highest clock does mean the highest performance.  Designers recognized that there is a speed limit to which you can push cpus, after which signals become indistinct and the component fails - somewhere around 5GHz.  As a result, they introduced new designs to spread the work around (parallel processing) and use instructions and pipelines that are more efficient.
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