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Intel Core versus AMD's K8 architecture - TechAmok
Intel Core versus AMD's K8 architecture - [hardware] 12:10 PM EDT - May,01 2006 - post a comment AnandTech
compared the Intel Core architecture it with the AMD "K8" (Athlon 64,
Opteron) architecture. Here's an excerpt:
Compared to the excellent AMD K8/Hammer architecture, the Core CPU is
simply a wider, more efficient and more out of order CPU. When I suggested
to Jack Doweck that the massive execution resources may not be fully used until
SMT is applied, he disagreed completely. Memory disambiguation should push the
current limits of ILP in integer loads a lot higher, and the massive bandwidth
that the L1 and L2 can deliver should help Core to come close to the execution
utilization percentages of the current P-M. 33% more execution potential could
thus come very close to 33% more performance, clock-for-clock.
So is it game over for AMD? Well, if you read the previous pages, it is pretty
clear that there are some obvious improvements that should happen in AMD's next
generation. However, there is no reason at all to assume that the current K8
architecture is at the end of its life. One obvious upgrade possibility is
to enhance the SSE/SIMD power by increasing the wideness of each unit or by
simply implementing more of them in the out of order FP pipeline.
To sustain the extra (SIMD) FP power, AMD should definitely improve the
bandwidth of the two caches further. The K7 had a pretty slow L2-cache, and
the K8 doubled the amount of bandwidth that the L2 could deliver for example.
It's not unreasonable to think a 256-bit wide cache bus could be added to a
near-future AMD design.
Finally, there is also a lot of headroom for increasing integer performance. The
fact that Loads can hardly be reordered has been a known weak point since the
early K7 days. In fact, we know that engineers at AMD were well aware of it
then, and it is surprising that AMD didn't really fix this in the K8
architecture. Allowing a much more flexible reordering of Loads - even
without memory disambiguation - would give a very healthy boost to IPC (5% and
more). It is one of the main reasons why the P-M can beat the Athlon 64
clock-for-clock in certain applications.
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