Question about PNY Optima 1GB PC2-5300 DDR2 SoDIMM Notebook Memory
I'm afraid it has to do with Apple's firmware on iMacs. A compatible 3rd party memory dealer is RAMJET.
From their website, you can see:
Apple Computers have proven too demanding for generic PC memory modules. Apple users have been forced to either pay Apple's high prices for upgrades, or buy 3rd party modules and be subjected to system crashes, boot failures, and sub-par performance. Worse still, most 3rd party vendors had no idea that Apple machines demanded a higher standard. At Ramjet, we start with modules built 100% to Apple's original specifications, but we don't stop there. In our compatibility center, we have a comprehensive array of Apples, every platform built since 1996. Other memory companies try to test for Apple compatibility using generic RAM module testers, whereas we test our RAM in the same Mac you're upgrading.
Posted on Mar 13, 2011
Testimonial: "Thanks for the insight - who knew?! I will go to Ramjet for memory from now on!"
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Posted on Jan 02, 2017
Tips for a great answer:
check to make sure you have added the right type of memory. also look at your user manual. it should tell you where and how to place the added sticks. sometimes they have to be added in pairs or have to be in specific slots. also if you dont have the manual it is on the gateway site. you should type in your model and serial number and get all the info you need.
Feb 12, 2011 | Gateway FX7026 PC Desktop
Dec 21, 2010 | Acer Aspire 5315 Notebook
Dual-channel architecture requires a dual-channel-capable motherboard and two or more DDR, DDR2 SDRAM, or DDR3 SDRAM memory modules. The memory modules are installed into matching banks, which are usually color coded on the motherboard. These separate channels allow each memory module access to the memory controller, increasing throughput bandwidth. It is not required that identical modules be used, but this is often recommended for best dual-channel operation. It is possible to use a single-sided module of 512 MB and a double-sided module of 512 MB in dual-channel configuration, but how fast and stable it is depends on the memory controller.
If the motherboard has two pairs of differently colored DIMM sockets (the colors indicate which bank they belong to, bank 0 or bank 1), then one can place a matched pair of memory modules in bank 0, but a different-capacity pair of modules in bank 1, as long as they are of the same speed. Using this scheme, a pair of 1 GB memory modules in bank 0 and a pair of matched 512 MB modules in bank 1 would be acceptable for dual-channel operation.
Modules rated at different speeds can be run in dual-channel mode, although the motherboard will then run all memory modules at the speed of the slowest module. Some motherboards, however, have compatibility issues with certain brands or models of memory when attempting to use them in dual-channel mode. For this reason, it is generally advised to use identical pairs of memory modules, which is why most memory manufacturers now sell "kits" of matched-pair DIMMs. Several motherboard manufacturers only support configurations where a "matched pair" of modules are used. A matching pair needs to match in.
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