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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).

- Neeraj Sharma

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17y ago

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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.

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16y ago
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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.

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14y ago
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No the pin configuration is different from DDR2 to DDR1 or DDR400 to DDR667

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17y ago
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In most cases, yes

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15y ago
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In most cases, yes.

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15y ago
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Q: Are DDR266 and DDR400 memory compatible?
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