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Intel Xeon workstation

Posted on 2013-06-20
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Last Modified: 2013-06-29
Dear all,

right now I am trying to buy a new workstation based on Xeon 2650 CPU, that Xeon has an architecture of supporting 2 x QPI link, do anyone know what use it is ?

I google that and it seems that this feature is talking about the data communication about CPU, RAM and RAID card/disk subsystem ?

please help to explain what use it is.
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Question by:marrowyung
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Expert Comment

by:_
ID: 39264205
{quick and dirty explanation}

Basically QPI is the new FSB.
So instead of having only one "road" through the motherboard between the cpu(s) and chip set (like the old Front Side Bus) to carry the "traffic",  you have 2 "roads" for it to travel on.
The chipsset(s) talk to the drives and other stuff you can plug into the computer (eg: usb).

Ram doesn't come into it, as that's a different "road".

Hopefully someone else can give a better description of it to you.
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by:marrowyung
ID: 39264810
"Basically QPI is the new FSB.
So instead of having only one "road" through the motherboard between the cpu(s) and chip set (like the old Front Side Bus) to carry the "traffic",  you have 2 "roads" for it to travel on.
The chipsset(s) talk to the drives and other stuff you can plug into the computer (eg: usb)."

yeah, I know QPI is 2 way, it is also bi-direction.

how about between CPU to CPU ?

it seems only buit inside the CPU but not about the motherboard, right?

so as long as the motherboard suppor this CPU, then QPI take effect ?
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Accepted Solution

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_ earned 500 total points
ID: 39264845
Not two-way (bi-directional). TWO roads. Both bi-directional.

Say 2 cpus with one QPI looks like this:

c \______________chipset
c/

Now 2 cpus with 2 QPI's:

c\/-----------------------|chipset  
c/\-----------------------|(that's suppose to be an X next to the cpu's)

so not only can the cpu's talk to each other, but share the link to the chipset, they can talk to each other and have their OWN link to the chipset. And if I understand it correctly, can use either link to do it.
The info I read described it as the whole thing is "networked together".
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Author Comment

by:marrowyung
ID: 39264908
so one CPU can't fully utilize 2 xQPI link ?
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Expert Comment

by:_
ID: 39264920
I haven't tried it or seen any mention of that specifically, so I can't say for sure, but I wouldn't think so.
Though it might get a slight improvement over a single QPI.
Depends on the workload.
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by:marrowyung
ID: 39276871
you are giving me the link of the same post.
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Author Closing Comment

by:marrowyung
ID: 39276872
why can't see the option to add to the KB ?
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by:_
ID: 39276945
Thank you much.    : )
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by:marrowyung
ID: 39276952
you are welcome as you helped me. keep watching my post and tell me something if you know the answer.

My new Workstation will be around 64GB of ECC RAM..
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Expert Comment

by:_
ID: 39276974
I can do that.   ; )
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by:marrowyung
ID: 39287745
I just ordered my new workstation based on E5-2650,...

64GB of RAM and it will run the adobe premium Pro CC and hopefully use 3D studio MAX.
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