can u mix pc 400 ram with pc 266?

ladiesman217

i upgraded my my ram to 512mb pc 400, its working fine. but im thinking if it is possible to add my pc 266 ram knowing they have different clock speed.

JDMurray

Yes, you can mix RAM of different speeds, but this causes all RAM modules to run only at the speed of the slowest module. So the DDR-400 (PC3200, 200MHz) modules in your computer will be running at DDR-266 (PC2100, 133 MHz) speed.

DDR SDRAM

ladiesman217

Thnks for the reply sir. the reason why i want to add the pc 266 is im going to setup a virtual lab.
i need more memory to get it running smoothly, i have 512mb of pc 400 but would it be better to have 768 ram with reduce speed?

JDMurray

The speed of the RAM is linked to the I/O Bus clock speed of your motherboard. If your clock speed is 133 MHz then DDR-266 is the RAM that the motherboard uses. Adding faster RAM (DDR-400) won't make the motherboard's clock speed faster. More RAM is always better, so a 768MB computer will run more processes more efficiently than with only 512MB. It also might be that the DDR-400 RAM is cheaper than the DDR-266 RAM because of availability.