TOPIC
This article defines and discusses the speed rating specification of RAM chips, and the ramifications of the rating.
DISCUSSION Apple's RAM specifications state the minimum speed to which the computer requires the RAM to be able to be accessed. It is the rated speed that the computer will access the RAM. The computer does not attempt to access the RAM faster if the RAM is rated faster. Faster RAM may be made of more modern chips or technology which could improve reliability. Faster rated RAM does not gain any speed advantage, nor does any harm as long as it meets other specifications for size, density, and so forth. Faster rated RAM would still be supported as far as compatibility, but still has to be a known good component when troubleshooting. RAM in the same bank must be the same speed. Different banks may have different speeds, as long as they are all rated fast enough for the computer. For example, if a computer had a speed requirement of 80 ns RAM, 60 ns would work, but not give any advantage over RAM rated at 70 ns or 80 ns. Note: Newer RAM specifications listed as PC-100 (or similar) and beyond have other specifications beyond their speed rating to be compatible. Please see the specifications for those computers directly for more information. Two examples of such articles are: Article 58182: " Power Macintosh G3 (Blue and White): RAM Specifications and Maximum Configuration " Article 20434: " Memory Configurations: Power Macintosh " Note: At one time Apple Computer had its name silk screened on the RAM or had stickers indicating that it was an Apple part. This practice was discontinued some time ago. |
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| Document Information | |
| Product Area: | Apple General Information |
| Category: | Product Information |
| Sub Category: | General Topics |
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