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[HyperServer]

به نقل از : FSB QPI - CPUs - CPU-Components

A Front Side Bus is a large parallel subsystem that transfers data  between computer components inside a computer or between computers.  Every component on a motherboard is connected to, and therefore shares, a  single Front Side Bus (there are systems with parallel FSBs but that's  another issue entirely). 

QPi, or Quick Path Interconnect, is a Point to Point Interconnect.  It connects the CPU (or several CPUs) to a I/O HUB (In and Out Hellenic  United Backbone). The I/O HUB is where the devices on the motherboard  connect too. A single Point connecting various devices to one or more  Point to Point interconnects. QPi works in a serial-differential manner  (as opposed to the parallel manner in which FSB works).  

QPi therefore offers the ability to transfer larger amounts of data  on a smaller electrical footprint than a Front Side Bus. The signal  integrity is also less prone to degrading in a Point to Point  Interconnect than it is with a Front Side Bus when scaling the operating  frequency in an upwards fashion. 

QPi offers: 
1. Lower Latencies 
2. More Bandwidth 
3. More Scalability 
4. Lower Footprint 
5. Cheaper Implementation

به نقل از : http://www.tomshardware.com/forum/275089-28-difference

I'm not sure in what context your refering to DMI, but if you mean  Desktop Management Interface then it is completely unrelated to FSB or  QPI. 

FSB and QPI are channels which a CPU uses to talk to other components in your system (RAM, GPU, IOs).  

FSB is found on old intel chips (core2 and older) and is a shared  bus that connects the CPU to the northbridge and through which all data  must pass. 

QPI is found on the new core i* CPUs and offers a direct connection  between the CPU and other components. Specifically it provides a  separate channel from communication between the CPU and RAM. 

The problem with FSB was that it created a bottleneck for all the  data going to/from the CPU. With QPI offering a dedicated path to memory  it significantly increases memory bandwidth.

اینم یه لینک دیگه :

http://forum.lowyat.net/topic/1352391/all#