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I have a Vaio vgn690 I was getting some error messages that suggested that there was a problem with one of the two pc4200 512MB mem sticks. I happed to have 2 - pc6400 1MB sticks lying around so I popped them in. it seems to run great. I realize that it may not be running the pc6400 sticks to full potential, but is their any reason I shouldn't continue running them?
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I have a Vaio vgn690 I was getting some error messages that suggested that there was a problem with one of the two pc4200 512MB mem sticks. I happed to have 2 - pc6400 1MB sticks lying around so I popped them in. it seems to run great. I realize that it may not be running the pc6400 sticks to full potential, but is their any reason I shouldn't continue running them?

Replace pc4200 with pc6400

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.

Laptops Notebooks

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.