“HyperTransport is a flexible protocol. A current specification for it is 800MHz, yet some chipsets currently run 600MHz. That is okay, the CPU just sets itself to the frequency the chipset can handle. Likewise, a future AMD64 processor capable of 1000MHz HyperTransport, is still backwards compatible with mainboards that run their chipsets at something less than 1000MHz,” an AMD spokesperson said.Source: X-bit Labs
Generally, compatibility between components of different generations means a huge benefit for companies that deal with inventory, e.g. mainboard makers and PC makers.
According to the recent roadmap, next year AMD will release faster versions of its 64-bit microprocessors made at both 0.13 micron and 90nm nodes and will also broaden its 64-bit lineup with some low-cost offerings. The family of AMD64 products for desktops planned to be released next year contain chips for Socket 754 with 1MB of 512KB of L2 cache and single-channel memory controller as well as for Socket 939/940 with 1MB of cache and dual-channel memory controllers. Besides, there will be 754-pin CPUs without AMD64 instructions and marketed under AMD Athlon XP brand-name.
FSB and Socket compatibility are generally not the only terms of compatibility between a mainboard and a microprocessor. In case a mainboard cannot provide enough power or current for faster chip with higher consumption, such platform will not be able to work with the processor. For instance, Intel’s higher-end Pentium 4 “Prescott” processors will not be able to work with quite some Socket 478 mainboards that feature 800MHz Quad Pumped Bus because of unexpectedly high power consumption of Intel’s next-generation processors due to be released on the 2nd of February, 2004.
Athlon 64 with 1000MHz HyperTransport bus compatible with current motherboards
Posted on Wednesday, Dec 10 2003 @ 15:55 CET by Thomas De Maesschalck
AMD declared yesterday that their 754-pin and 940-pin processors with 1000MHz HyperTransport bus, which will be launched in 2004, will be backwards compatible with current motherboards.