What is Intel QPI speed?
What is Intel QPI speed?
10.4 GT/s
UPI is a low-latency coherent interconnect for scalable multiprocessor systems with a shared address space. It uses a directory-based home snoop coherency protocol with a transfer speed of up to 10.4 GT/s. Supporting processors typically have two or three UPI links.
What is Intel QPI technology?
The Intel QuickPath Interconnect (QPI) is a point-to-point processor interconnect developed by Intel which replaced the front-side bus (FSB) in Xeon, Itanium, and certain desktop platforms starting in 2008. It increased the scalability and available bandwidth.
What is QPI frequency?
Short for QuickPath Interconnect, the QPI frequency or QPI Clock is a technology designed to be a replacement for the FSB on a computer motherboard. It was developed by Intel to compete with HyperTransport. Adjusting this setting in the hopes of making the computer faster makes no noticeable difference.
Is the QPI bus used today if so on which systems?
2 Answers. Yes, QPI is used to access all remote memory on multi-socket systems, and much of its design and performance is intended to support such access in a reasonable fashion (i.e., with latency and bandwidth not too much worse than local access).
Is QPI a bidirectional bus?
The QPI has a bandwidth of 12.8GB/s in each direction simultaneously for a combined bi-directional bandwidth of 25.6GB/s. Each PCI-E Gen 2 lane operates at 5Gbit/sec for a net bandwidth of 500MB/s per lane, per direction.
What is UPI bandwidth?
The UPI runs at a speed of 10.4 gigatransfers per second (GT/s). Each link contains separate lanes for the two directions. The total full-duplex bandwidth (2 links x 2 directions) is 41.6 gigabytes per second (GB/s).
What is the speed of the fastest DMI bus vs fastest QPI bus?
QPI- 25.6GB/s of bidirectional bandwidth at 6.4Gt/s or 12.8GB/s one way. DMI-2GB/s of bidirectional bandwidth or 1GB/s one way.
How is memory bandwidth calculated?
The theoretical maximum memory bandwidth for Intel Core X-Series Processors can be calculated by multiplying the memory frequency (one half since double data rate x 2), multiplied by the number of the bytes of width, and multiplied by the number of the channels supported for the processor.
What is FSB and QPI?
FSB stands for Front Side Bus. It is an old subsystem transfer. Intel® QPI stands for Quick Path Interconnect. This means that the processor has another bus subsystem transfer technology, such as Intel® Ultra Path Interconnect (Intel® UPI).
Is QPI a bidirectional bus True or false?
The QPI has a bandwidth of 12.8GB/s in each direction simultaneously for a combined bi-directional bandwidth of 25.6GB/s.
Is RAM and bandwidth the same?
Memory bandwidth is how much information can be sent from the memory to the processor in a given time. This is often measured in MB per second. RAM clock speed the rate that the RAM clock run in, measured often in Mhz. This is related to, but not the same as to memory bandwidth.
What is the data rate of Intel QPI?
Thus, Intel describes a 20-lane QPI link pair (send and receive) with a 3.2 GHz clock as having a data rate of 25.6 GB/s. A clock rate of 2.4 GHz yields a data rate of 19.2 GB/s.
What is Intel QuickPath Interconnect (QPI)?
The Intel QuickPath Interconnect (QPI) is a point-to-point processor interconnect developed by Intel which replaced the front-side bus (FSB) in Xeon, Itanium, and certain desktop platforms starting in 2008. It increased the scalability and bandwidth available.
What is the frequency range of QPI?
Frequency specifications QPI operates at a clock rate of 2.4 GHz, 2.93 GHz, 3.2 GHz, 3.6 GHz, 4.0 GHz or 4.8 GHz (3.6 GHz and 4.0 GHz frequencies were introduced with the Sandy Bridge-E/EP platform and 4.8 GHz with the Haswell-E/EP platform).
What is the data rate of a QPI link pair?
Thus, Intel describes a 20-lane QPI link pair (send and receive) with a 3.2 GHz clock as having a data rate of 25.6 GB/s. A clock rate of 2.4 GHz yields a data rate of 19.2 GB/s. More generally, by this definition a two-link 20-lane QPI transfers eight bytes per clock cycle, four in each direction.
https://www.youtube.com/watch?v=BUR8Sh3W5c4
