amd brisbane to buy or wait

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POSTER: computer news   ||   AMD BRISBANE TO BUY OR WAIT	DATE:2006-12-21
The more processors athlon 64 X2 0.065 m core brisbane appear into hands of reviewers, the more frequently was asked the question about the reasons for the delay of these processors from the analogs 0.09 m core windsor (the more precisely saying, Manchester - for the versions with 2 X 512 KB cache in the second level). With equal frequencies and cache volume new 0.065 m processors lagged behind the predecessors by several percentages, moreover this frequently was manifested in games, which can be considered the sufficiently popular type of applications. On this score there were two basic hypotheses. One referred to the increased delays at the level of the integrated memory controller and/or cache of the second level. The second attempted to connect break in the speed with the application of the fractional multiplier, which for processors brisbane change with the step of 0.5x. The first hypotheses was confirmed by the representatives AMD. Thus, 0.065 m processors brisbane stepping G1 actually have the increased delays at the level of the integrated memory controller and cache in the second level. In the latter case increase in the delays composes approximately 66% - completely solid value, which influence the speed of processors. Directly delays at the level of the memory controller was increased on 0.4 ns, i.e., they cannot seriously influence the operating of system speed  . since the official commentaries with the reasons for the increase in the delays no one of AMD representatives can make. If delays were due to the sight to increase in the volume of cache, then 0.065 m processors with the more capacious cache of the second level for sure would appear in the plans AMD; however, the core brisbane in this sense is limited by 2 X 512 KB. Generally, these processors are economically effective alternative from mass 0.09 m models athlon 64 X2, capable to reduce prices and raise the volumes of production. Therefore ambitions on the increase in the volume of cache and the race after of the high frequencies to the core brisbane must be alien. Most likely, the first generation of 0.065 m processors AMD obtained the increased delays at the level of cache for some technological reasons -  this is the first for AMD experience on the release of 0.065 m processors. Possibly, new revisions on core brisbane will solve this problem, as this frequently was with the change of the stepping 0.09 m core. As far as about hypothesis with the influence of fractional multiplier on the operating speed of system is concerned. The matter in the fact that each model processor socket AM2 has its inconvenient frequency dividers of memory, and 0.065 m processors athlon 64 X2 with their multiplier can not becaume exception. As American associates explain, the models brisbane with the odd muliplier (13x - > 5000+) and the non-integral multiplier (12.5x - > 4800+, 11.5x - > 4400+, 10.5x - > 4000+) exploit the memory type DDR 2-800 at the frequencies lower than default; therefore some delay from the models with the integral can be observed. Meanwhile fractional multiplier are necessary to the processors brisbane - because of the failure to release processors with 2 X 1 mb cache . it is necessary to decrease the step of the default frequencies of processors. By the way, the processor athlon 64 X2 4800+ (2.5 GHz) for American associates was succeeded to overclock to 2837 MHz, and the coefficient Of hyperTransport was lowered to 4x. other reviewers with the overclock Of brisbane almost always tried to reduce this coefficient, but in the majority of the cases to the result had no effect; therefore this multiplier did not change with final overclock. In the specific case regular cooler was used, and passage to the more powerful cooling system would for sure allow overclock processor to frequency on the order of 3.0 GHz; however, 0.09 m processor under such conditions for sure would overclock to about the same, so to speak about the superiority Of brisbane in this sphere it s not be necessary. new stepping will bring some improvements,but AMD does not place purposes on the orientation of 0.065 m processors generation K8 on the subjugation of high frequencies. They must be inexpensive ,mass and also economical from the point of energy consumption. After the release of processors K8L the priorities for sure will be replaced, but for us is necessary to deal only with concerning the first revision core brisbane. Let us note that the appearance still colder in comparison with predecessors processors brisbane indirectly pushed slightly Intel to the modernization of the energy characteristics of processors core 2 Duo; therefore it cannot be asserted that Conroe does not absolutely fear rivals. Simply intel processors demonstrate better relationship performance and energy consumptions, although some processors AMD are more economical in the absolute expression. For potential owners of 0.065 m processors athlon 64 X2 it does not be worthwhile to despair, and to think that the core brisbane is  not very successful from the view of speed - all this is correct only for the processors of the first revision, and many characteristics for sure will be improved in the forthcoming months. AMD only began its way from the work with 0.065 m technical process, but to the middle of 2007 it will already make this technical process a large rate, after foregoing the production of 0.09 m processors. 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