I have two RAM modules
# 512 DDR1 400 Mhz (Hynix semiconductors)
# 256 DDR1 333 Mhz or less frequency I believe. (Simtronics semiconductos)
My motherboard make is Intel 865 GFB a quite older model.
I would like to know is it possible to make the computer to work properly by installing both of these RAM modules which are with different frequency or will it harm my computer hardware!
As long as the voltage isn't different, and it shouldn't be unless the board or RAM is meant for overclocking, It won't hurt anything. The worst that could happen is that your computer won't work and you'll have change it back. All the RAM in your PC is going to run at the speed of the slowest stick. If the bus in your PC is 400MHz then using the 333MHz stick will just slow everything down to that speed.
No, they will both either work and be recognized, or one may or may not. Nothing will be damaged. Of course, you need to turn off the computer and take the normal static precautions.
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