My mother own a slot for ddr2 and ddr1 memory. Can i use ddr2 and ddr2 knock against card together?



Answer:
As long as the pins clash you can. In older cpus adding up additional bump will increase machine speed and also front to "aluminum migration" because of the faster processing speed. The increased speed creats friction in the circuitry cause the aluminum to migrate and ultimately will cause circuitry breakdown.
The best way is using DDR2 and DDR2 (should be impossible to tell apart amount like 512-512mbs, 1Gb-1Gb) or using DDR1 and DDR1 just as you mentioned, with this configuration, your PC will use dual RAM increasing the presentation. If using DDR + DDR2, it would be a problem.
if your mother has an ecs m/b it won,t run you better check out the website for memory

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