What are the differences between 6×86 chip revisions?
A. It is Cyrix’s corporate policy not to discuss the specific details of the company’s chip revisions. The only differences between 6×86 chip revisions that Cyrix will make public occur as a result of manufacturing. The first 6×86 samples and the PR120+, PR133+, and PR150+ parts were manufactured using a 0.6 micron technology. The PR166+ & PR200+ parts up to revision 2.7 were manufactured using a 0.5 micron technology. The revision 3.7 and above parts are a 10% optical shrinked design and were manufactured using a 0.44 micron technology. The revision 4.2 (6x86L) parts are a dual voltage (core 2.8v, I/O 3.3v) chip manufactured using a 0.35 micron technology. These chips have a 2.8V label written on them and will use the low voltage 6x86L setting available on some motherboards. Another technical term being used for the dual voltage setup is split-rail.
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