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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Member since:

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.

Reply Parent Score: 2

mmebane Member since:

Look at the linked Yahoo News article:

Reply Parent Score: 2

tylerdurden Member since:

Why would I need to read a 3rd party article, by a non-technical writer, when I was getting the specs directly from IBM?

Do you guys even comprehend the impossibility of a single chip at that 45nm process with those cache sizes?

See the specs from IBM directly, or if you need a 3rd party check wikipedia:

A 16 MB of L1 would be idiotic, since it could actually make things like context switches very costly with so much local data to flush in/out.

Reply Parent Score: 3

rom508 Member since:

Yes you're right, the specs I quoted do look a bit bogus. I just copied them from the first article I found in the Internet.

Reply Parent Score: 1