| ID | | Article Title | Post Date |
|
82 | 
| Will my HARMONi upgrade recognize any DIMM? | May-12-09 |
| The HARMONi will work with any DIMM that works with the "stock" iMac (rev. A - D), supporting total memory up to 512MB.
There are some 256MB modules that can only be utilized as 128MB, due to a limitation of the parts used at the time that these iMacs were manufactured. A controller chip used in the system's design can recognize a maximum of 128MB of RAM in each "bank" of memory. Until recently, virtually alll 256MB DIMMs used two banks of 128MB. Recent advances in RAM have led to the introduction of some DIMMs with 256MB in a single bank, which has raised the visibility of this issue. These parts are stable, and are not known to reduce system reliability, but they will not deliver the full desired memory capacity. There is no single method for identifying these parts without installing them, so it is recommended that you work with a reseller who can either confirm the design, or who will accept a return based on compatibility. |
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|
169 | 
| May I discard my original CPU after installing Sonnet's upgrade cards?
| May-07-09 |
|
171 |
| The speed indicated on the G3 or G4 chip on my Sonnet processor upgrade doesn't seem to match the speed of the upgrade I purchased. What's the story? | May-07-09 |
|
218 |
| The computer's standard startup process takes noticeably longer after upgrading to any Mac OS 9.x system from Mac OS 8.6 or earlier. | May-12-09 |
| This is not a malfunction and is not related in any way to Sonnet upgrade products; this is the result of an additional Mac OS 9.x startup process that did not occur during startup in earlier Mac OS versions. There is a new "hidden" Mac OS 9.x feature called Startup Memory Tests in the Memory Control Panel, which defaults to the "On" setting. This adds time during a startup or restart, as all of the RAM installed in the computer is checked.
This issue affects any machine running OS 9.x (OS X status is unknown as of this writing), with or without upgrades installed. The more RAM installed, the longer the test. (Note that a Mac upgraded with a Sonnet G3 or G4 processor card gets through this process much faster than a "stock" machine.)
Since this is not a malfunction, no solution is required. However, since RAM seldom fails after the first few days of regular use, you may turn this test off if a faster startup cycle is desired. To access this feature you must hold down the Command key and the Option key WHILE opening the Memory Control Panel. When the control panel opens, you will see a setting at the bottom of the control panel. Click the Startup Memory Tests' Off button, then close the Memory Control Panel. Be aware that from now on, when you start up or restart your computer, the Mac OS will NOT check your RAM. If in the future you suspect a memory problem and want to check your RAM, you will need to repeat this procedure and turn the Startup Memory Tests back on. |
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|
245 |
| The FireWire port on HARMONi-upgraded iMac computers is disabled. Also, Apple System Profiler reports machine speed as "66 MHz" after installation. | Jun-24-09 |
|
246 |
| Although the installed processor upgrade card works properly, devices connected to the FireWire port of the HARMONi upgrade cannot be used. | Jun-24-09 |
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