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Which "Server" to build , Dual Xeons vs i7 3930K

post #1 of 15
Thread Starter 
Hello all,

I would like your opinion for my next purchase.

I run some Desktop machines that host some Virtual Machines that run 3D applications.

I7 2700K 3,5ghz@3,5ghz
32GB DDR3 1600mhz RAM
2xSSD 120GB Agility
GPU - HD 7870 2GB

This example, runs 22-25 VMs.

More details, this VMS consume around 24 Threads and 5-7% CPU consumption.

Now I wish to buy one more Machine, they will have not the same Price however I wish to know if the difference of price will have a good increase of performance or not.

1st Setup: I expect to run 32-35 Vms

i7 3930K
Intel Desktop Board DX79TO Intel X79
48GB Gskill DDR3 2400Mhz
2x SSD Samsung Pro 840 128GB Raid 0
GPU 2048MB Sapphire Radeon HD 7870 OC
PSU 850W Modular Silent

This first setup its hitting around 1400€

2nd Setup: I expect to run 55-60 VMS

2x XEON e5 2620 2GHz
Asus Z9PE-D8 WS Intel C602
64GB Gskill DDR3 2133Mhz
2x SSD Samsung Pro 840 256GB Raid 0
GPU 2048MB Sapphire Radeon HD 7870 OC
PSU 1000W Modular Silent

This second setup its hitting around 2400€


Maybe my expectations are wrong, I don't know what is the CPU speed vs Core relation. If I hit the double of VMs with the last setup it will be cheaper to buy it, if I don't then maybe I should go to the cheaper.

Having the extra CPU clock speed help to compensate less cores available?

Thanks for the help.

Regards
Edited by nhcoohrh - 2/27/13 at 2:16am
post #2 of 15
Well the thing is big servers don't overclock since it isn't very power efficient.

However, on a small scale you can actually benefit from buying an overclock-able cheaper alternative, the overclocked cores won't outperform (maybe they will ? I doubt it though) the 24 threads on the Xeons but it is a hell of a lot cheaper. I'd go for the 3930K.
Edited by MoGTy - 2/27/13 at 2:07am
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post #3 of 15
Thread Starter 
So you are saying the second setup will consume less Power, since it's not overclocked and it's more power efficient.

I already run 5 Machines 8 cores machines similar to the one I posted as first, the Electricity bill have some size already. However it's not a problem since more VM's will mean more "earnings" in the end.
post #4 of 15
Well no not exactly but in terms of performance / watt, the server chips will do better. They will consume more power. But are better in terms of power efficiency.

if you look at this graph



You'll see that in order to be as efficient as two E5 2620s (95W) you'll need to be able to outperform them with only one 3930K before the 190W overclocked mark to be MORE efficient in performance per watt.
Edited by MoGTy - 2/27/13 at 2:16am
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post #5 of 15
Thread Starter 
So this means will be more power efficient. Yes I also believe so. But like I said power it's not an issue here.

Performance it's my only concern.

If with this dual xeon I'm only able to run 40-45 VMs then doesn't worth the difference of money.

I was trying to find the amount of threads I could have available on i73930K and on Xeon E5 2620.

Since I know that each VM consumes 24 threads and 5-7% of the CPU.
post #6 of 15
Overclocked, to about 4+ghz the 3930k beats the xeons :-) and you save a lot of money
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post #7 of 15
Depends on your application, which is best for you. The i7 has more power per core, but you will have double the cores with 2 of the Xeons. Expandibility is another thing to keep in mind as the 3930K will support a max of 64GB of RAM, whereas the Xeons will support up to 750GB of RAM.

With the Xeon box, you will be able to run more VMs, especially if your application is multithreaded. Are you looking to run a certain number of VMs, or as many as possible?
post #8 of 15
Thread Starter 
My goal it's to have more VM's possible for the money.

Yes I understand that i7 its more powerfull and can be OC, But can beat 2x Xeon in number of VM's I will be able to run?

On the example machine I gave above, its running 20 VMS at the moment with the following resources used:



I can push it to 25 Vms, however like you see the CPU are already on 100% mark.

Yes I will downgrade from 3.5Ghz speed to 2.5Ghz speed top. However the VM's doesnt need more than 2Ghz. Don't know really how it works the Vmware Workstation when creating this vCPUs.

If with the second setup I hit 60 VMs I'm really happy.

Only not sure if the 2x 256 SSD Raid 0 will handle so much VMs. And instead could divide into 2x 2x SSD 128gb Raid 0 instead.
Edited by nhcoohrh - 2/27/13 at 4:38am
post #9 of 15
Since memory doesn't seem to be a problem with the VMs you currently run, I'd suggest the more powerful CPU. Whether it could beat 2 xeons in terms of CPU utilization ? Sure, if you get a decent overclock. Will you be unable to use more RAM once you hit 64GB ? Nope, so if you plan on using more RAM being able to expand. Get the Xeons. In terms of pure horse power (which is what you need on your current VMs) I'd suggest the more powerful CPU.

It's your pick really.
Edited by MoGTy - 2/27/13 at 5:04am
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post #10 of 15
No no no. Higher clock does not necessarily mean more VMs. More threads DOES mean more VMs. I will bet money that a pair of those Xeons will hold more VMs than that i7.

How many cores do you currently have assigned to each VM? How utilized is the CPU inside the VM?
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