Linked by Thom Holwerda on Thu 26th Aug 2010 23:24 UTC
IBM At the Hot Chips 2010 conference, IBM announced their upcoming z196 CPU, which is really, really fast. How fast? Fastest chip in the world fast. Intended for Z-series mainframe computers, the Z196 has a clock speed of 5.2GHz. Measuring just 512 square millimeters, the Z196 is fabricated on 45nm PD SOI technology, and on its surface contains almost one and a half billion transistors. My... Processor is bigger than yours.
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RE: Slooooow cpu.
by Nicholas Blachford on Mon 30th Aug 2010 12:13 UTC in reply to "Slooooow cpu."
Nicholas Blachford
Member since:
2005-07-06

As someone explained on the internet


Yes, because everything you read on the internet is true isn't it?

People have been saying desktops are faster then mainframes since the 80's. But big companies like banks still use mainframes, there's usually a good reason for that.

It's somewhat pointless comparing a desktop CPU to a mainframe CPU. The desktop only has a few cores and that's it. A mainframe has a whole set of different types of cores. It's a pretty much a distributed systems of dedicated processors, with the CPUs being only one of many types of core. If you want to compare performance you need to compare to ALL of the cores in the mainframe.

As someone else said, mainframes are really designed for transaction processing with huge levels of I/O. A decked out z196 goes up to 288GB/second bandwidth. That's 8x more bandwidth than your 8 core Xeon has memory bandwidth!


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As for the cache sizes, they are:

L1
64KB Instructions
128KB data

L2
1.5MB / core

L3
24MB / shared across 4 cores

L4
192MB shared across 24 cores

That's per "book" you can add 4 books.

...and they are backwards compatible with code written in the 1960's.

More info here: http://www.redbooks.ibm.com/redpieces/pdfs/sg247832.pdf

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