RAM la viet tat cua cum tu random-access memory, tuc bo nho truy cap ngau
nhien. Trong may vi tinh, RAM la tram trung chuyen, noi chua cac lenh va du lieu
de CPU co the moc lay ra ma xu ly.
May vi tinh de ban (desktop PC) hien co 3 loai RAM :
SDRAM : Giao dien DIMM voi 168 chan, co 2 khe cat o phan chan cam.
Hien chi con 2 toc do PC100 va PC133.
RDRAM : Co giao dien RIMM 184 chan voi 2 khe cat o giua.
Do toc do cao, toa nhiet du, RDRAM luon phai cap ke voi mot mieng nhom tan nhiet.
Voi cau hinh “kenh doi” (dual-channel), RDRAM bat buoc phai chay cap 2 thanh mot
va khong duoc bo trong hai socket con lai (nen phai dung hai thanh RDRAM gia,
goi la CRIMM - Continuity RIMM). Hien nay pho bien la RDRAM PC800.
DDR-SDRAM : DDR cung su dung giao dien DIMM nhu SDRAM,
nhung co toi 184 chan va chi co 1 khe cat. No cung dung mot kenh don nhu SDRAM
nen co the chay doc lap, tung thanh mot. Hien nay, tai TPHCM dang co DDR voi 3
toc do DDR266, DDR333 va DDR400.
Article source http://w4rum.com/485.t
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