AMD Resurrects K8 Architecture for 2008 Roadmap
Kristopher Kubicki & Gabriel Ikram
December 5, 2007 10:22 AM
comment(s) - last by
AMD plans to keep "Brisbane" around, releases new chips based on it
Things at AMD may have gone from bad to worse with the lackluster Phenom launch in late November. Not only did Phenom fail to appeal to professional reviewers, but the company ended up removing
one third of its CPU lineup just after the big day
Last week AMD CEO Hector Ruiz vowed that the company would stop hemorrhaging cash and return to profitability soon. "That is our number one goal right now," Ruiz said
in a conference in Bangalore
Making a profit at AMD apparently means refocusing on its older K8 architecture. The company will introduce eleven 65nm K8 processors over the next two quarters. By comparison: AMD launched two quad-core K10 Phenom processors in November
with three more scheduled over the next two quarters
. Two tri-core Phenom processors
will follow in March 2008
Essentially, AMD will move any remaining Athlon 64 processors from the 90nm node to the 65nm node, with a few new frequency and TDP variations.
The AMD Athlon 64 X2 5600+ will be the first to jump on the new 65nm K8 bandwagon with a 65W TDP.
of the same featured an 89-Watt TDP. AMD will also add 100 MHz to the core frequency of the Athlon 64 X2 5600+, now rated at 2.9 GHz. Total L2 cache will be halved in the move to the Brisbane core, and the updated Athlon 64 X2 5600+ chips will feature only 1MB of L2 cache. Availability of these processors is scheduled for Q1 2008.
AMD's higher-end Athlon 64 X2 6400+ and Athlon 64 X2 6000+ will both be discontinued.
AMD will also update its "Energy Efficient" series and will release three new chips, the AMD Athlon 4850e, Athlon 4450e, and Athlon 4050e in Q2 2008. All of the new offerings will be based on AMD's
core and will feature a 45-Watt thermal envelope. AMD's current energy efficient "BE-2xxx" series will be phased out at that time. Respectively, the new chips will run at 2.5GHz, 2.3GHz and 2.1GHz.
chips will be based on the Socket AM2 interface. These processors are compatible with AMD's AM2+ socket designated for Phenom processors.
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RE: Goodbye AMD
12/7/2007 2:37:30 AM
Well done.... the argument boils down to cache really.
Fast bus + small cache or slow bus + large cache, the design choice of either combination is balanced to hit certain performance goals.
Cache hit/miss rate goes as a power law in terms of overall capability, the larger the cache the lower the miss rate (a miss being a situation where the processor needs data but does not find it in cache).
Small caches have high miss rates, to mitigate the penalty for going to DRAM, simply design a bus to get it there faster (high BW, low latency), so if you miss say 5 times out of 20 attempts, you may pay only 8 cycles penalty waiting.
Large caches have low miss rates, so you may only miss 2 times out of 20, but you must pay 12 cycles penalty waiting on the slow bus.... just an example.
It is completely possible with the 'archaic' FSB to out perform the novel and slick IMC implementation so long as the caching technology is par excellent (which C2D has), consequently high quality memory is not nearly as impactive on a well cached CPU as opposed to a cache lean CPU.
Where the FSB becomes more problematic are in large throughput, large working set situations where even a larger cache becomes overwhelmed ... hence SPECFP_rates (large data sets, high through put) really shine on the high BW busses.
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