"Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand.)These i Mac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.
The maximum amount of random-access memory (RAM) you can install in each computer is: You can use a 1GB or 2GB RAM module in each slot for i Mac (Mid 2007) and i Mac (Early 2008).
If your computer doesn't recognize the memory or doesn't start up correctly, confirm that the RAM you installed is compatible with your i Mac and that it's installed correctly by reseating the memory.
If you continue to have issues with the memory in your i Mac, contact Apple Support.
The individual flash memory cells exhibit internal characteristics similar to those of the corresponding gates.
While EPROMs had to be completely erased before being rewritten, NAND-type flash memory may be written and read in blocks (or pages) which are generally much smaller than the entire device.
Your i Mac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs.
This process can take 30 seconds or more, and the display of your i Mac remains dark until it's finished.
If all the memory in the i Mac has been replaced, it lists the new total of all installed RAM.Core Duo i Mac computers should operate normally with a single DIMM installed in any slot, top or bottom.("Top" and "bottom" slots refer to the orientation of the slots in the pictures below.NAND or NOR flash memory is also often used to store configuration data in numerous digital products, a task previously made possible by EEPROM or battery-powered static RAM.
One key disadvantage of flash memory is that it can only endure a relatively small number of write cycles in a specific block.
This makes it a suitable replacement for older read-only memory (ROM) chips, which are used to store program code that rarely needs to be updated, such as a computer's BIOS or the firmware of set-top boxes.