arash-max :
thank you very much,i think i'm right about my last question,so YOU SOLVED MY PROBLEM now.(that link about PICK AS SOLVED solution didn't work,i must try it tomorow...THANK'S brother for your help and especially for your time,you'r so kind & professional.
Memory Real Clock Maximum Theoretical Transfer Rate Memory Module
DDR200 100 MHz 1,600 MB/s PC-1600
DDR266 133 MHz 2,133 MB/s PC-2100
DDR333 166 MHz 2,666 MB/s PC-2700
DDR400 200 MHz 3,200 MB/s PC-3200
DDR2-400 200 MHz 3,200 MB/s PC2-3200
DDR2-533 266 MHz 4,266 MB/s PC2-4200
DDR2-667 333 MHz 5,333 MB/s PC2-5300
DDR2-800 400 MHz 6,400 MB/s PC2-6400
DDR2-1066 533 MHz 8,533 MB/s PC2-8500
DDR3-800 400 MHz 6,400 MB/s PC3-6400
DDR3-1066 533 MHz 8,500 MB/s PC3-8500
DDR3-1333 666 MHz 10,666 MB/s PC3-10600
DDR3-1600 800 MHz 12,800 MB/s PC3-12800
DDR3-1800 900 MHz 14,400 MB/s PC3-14400
DDR3-1866 933 MHz 14,900 MB/s PC3-14900
DDR3-2000 1000 MHz 16,000 MB/s PC3-16000
You're welcome.