Yes for most practical purposes these are compatible (as long as these are same form factor). If you have a motherboard which supports DDR400. You can install any of the DDR266, DDR333, DDR400 modules. All these memories will work (at the speed of the slowest speed memory).
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Yes, you can in almost all cases. While it will always fit in, in very rares cases it may not work, either the system will fail to boot or there will be unexpected instability. This would be very rare however.
Generally, Yes. The number represents the speed that the memory runs at. Most memory will slow down, but won't speed up (unless overclocking, which requires a motherboard that allows it), so in your case yes. DDR667 in a board that requires DDR800 wouldn't work.
Some examples of computer motherboards compatible with PC3200 DDR400 memory are computers with XD motherboards which run a lot faster and have more raw access memory.
PCMCIA stands for Personal Computer Memory Card International Association. It is a standard for externally accessible expansion slots that accept cards that are compatible.
This varies between motherboard manufacturer's. You would need to contact your motherboard manufacturer e.g ASROCK to find out for sure.
Almost always it is not the printer that is short on memory, but the computer that is using it. And in fact, the computer may not be short on memory, but on disk space. The first fix, then, is to check that the disk drive where the print queue is kept (usually C:) has at least some free space. With modern operating systems (Windows XP and later), at least 500 megabytes should be available on your C: drive. If the printer itself is reporting that it is out of memory on its display, the only solution is to buy more memory for the printer. Most printers that use their own memory, rather than relying on the computer for storage, will have memory slots where some form of memory cartridge or stick can be inserted. Do not assume that if it is a standard size, that it is also a standard memory; printer manufacturers have proprietary memory, just as they have proprietary cartridges, and inserting standard computer memory into a printer's memory slot can destroy both printer and memory, and will certainly void any warranty you have. Contact the store where you bought the printer, or the printer manufacturer, for sources of compatible memory. Older printers would actually require that you buy an entire memory board, and install it inside the printer housing. Some such memory boards are available on eBay or other auction sites. If you need one, be certain that the memory board is for your exact model of printer, and check the seller's feedback before bidding.
Volatile memory refers to RAM that needs to be constantly refreshed to be retained. Static memory is permanent storage that is retained even after the computer is turned off.