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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tylerdurden
Member since:
2009-03-17

Where did you get your numbers? 12MB of L1? Whaaaa?

From IBM's specs:

L1 Instruction Cache = 64KB
L1 Data Cache = 128KB
L2 Shared I+D Level = 1.5 MB

The numbers you quoted for the L1 for example, amply exceed the total transistor budget for the whole chip quoted by IBM.

As I said, things like finely tuned branch predictors make as much of an impact as huge caches. In fact, there start to be diminishing returns for most cache sizes after a few megabytes.

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