DIMMs (Dual In-line Memory Modules) can hold varying amounts of memory, typically ranging from 4 GB to 64 GB per module for consumer-grade RAM. High-performance or server-grade DIMMs can offer even larger capacities, with some modules reaching up to 256 GB or more. The total memory capacity in a system depends on the number of DIMMs installed and the maximum supported by the motherboard.
You can get memory dimms as big as 4 gigabytes and your computer will have three or four slots for a dimm.
Types of DIMMs are DDR3 and DDR2 that have 240 pins, DDR DIMMs with 184 pins and SDRAM DIMMs with 168 pins.
In principle, you could 896 MB, however you'll almost certainly have to remove the 128MB memory and replace it (probably with two 512MB). If this is what I think it is, namely a blue and white Apple Power Macintosh G3, the computer had two 64MB DIMMs in it when it shipped. You have three options: Install two 256MB DIMMs (always PC133--the book says PC100, but PC133 is compatible and it's all you can get now anyway) alongside the 64MB DIMMs to have 640MB RAM. Remove one 64MB DIMM and install three 256MB DIMMs for 896MB. Remove both 64MB DIMMs and install four 256MB DIMMs for 1GB.
DRAM
SIMMs are pretty much obsolete. DIMMs are the currently popular choice for desktop style computer memory. (Laptops use SO-DIMMs.)
72-pin SO-DIMMs, 144-pin SO-DIMMs, 160-pin SO-RIMMs and credit card memory
Some systems use dual memory channels to access ram, if you dont have a pair of memory sticks, it cant work in dual mode, thus not allowing the system to boot. You can buy special DIMM plugins that fool the computer into thinking there are a pair of DIMMs. The other issue could be if your using registered DIMMs in with unregistered DIMMs
A narrow printed circuit board (PCB) that holds memory chips is typically referred to as a memory module or memory stick. Common examples include DIMMs (Dual In-line Memory Modules) used in computers and SO-DIMMs (Small Outline DIMMs) used in laptops. These modules provide a compact way to integrate multiple memory chips, facilitating efficient data storage and retrieval in electronic devices.
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While 184-pin DIMMs and 168-pin DIMMs are approximately the same size, 184-pin DIMMs have only one notch within the row of pins
dual channels
RIMMs are traditionally faster and more expensive