| Issue 1: There are specific memory requirements for proper operation of this innovative upgrade. While these are documented in the Crescendo/7200 quick start guide, they may have been overlooked, so please review the solution below carefully.
Issue 2: Sonnet has determined that certain memory DIMMs are less stable than others when used with early production units of the Crescendo/7200 solution. Sonnet has since released both hardware and software updates to provide compatibility with a greater variety of memory. If implementing the solutions recommended for Issue 1 is not effective, you may be encountering a memory compatibility issue.
Solution for Issue 1 (all three must be followed):
1) DIMMS used for RAM expansion should be: 5 volt, 64-bit-wide, 168 pin, fast-page mode, and 70 ns or faster (smaller numbers are faster).
2) Total RAM installed on the Crescendo/7200 card must be equal to or greater than the RAM installed on the Power Macintosh motherboard.
3) In order to run System 7.5.3 through Mac\u172\u198 OS 8.6, there must be a minimum of 16 MB RAM on the motherboard, with equal or greater memory on the Crescendo card. In order to run Mac OS 9.0 through 9.1, a minimum of 32 MB is required on the motherboard, with an equal or greater amount on the Crescendo. While Sonnet plans to bring OS X to the Crescendo/7200, no final announcements have been made, and no RAM requirements have been defined at this time.
If you have satisfied all of the above conditions and are still experiencing problems, please proceed to the following solution.
Solution for Issue 2: Make sure you are using the latest Crescendo/7200 software.
Locate the serial number label on the back edge of the card on the side opposite the DIMM slots. If your Crescendo/7200 has a serial number that begins with an A (e.g. Axxxx), you are eligible for a free upgrade of your hardware that will provide compatibility with a wider array of memory DIMMs; contact Sonnet Customer Service at 1-949-472-2772 for instructions on returning it for this revision. If your card has a serial number that begins with a B, this revision is unnecessary; your card was manufactured with the latest updates.
If your card falls outside the identified ranges, and you continue to experience problems, call Customer Service at 1-949-472-2772 for further assistance. |