Sunday, June 23, 2019

PENGERTIAN MEMORY / RAM PADA PC/LAPTOP

Kadang kita bingung membedakan Ram DDR1, DDR2 dan DDR3. Gimana  sistem perhitungan clocknya dan kelas-kelasnya. 
Dengan DDR dan clocknya, berikut ini saya tampilkan tabel clock dan transfer ratenya. Semoga bermanfaat.

DDR1:
  • DDR-200 = PC-1600
  • DDR-266 = PC-2100
  • DDR-333 = PC-2700
  • DDR-400 = PC-3200

DDR2:
  • DDR2-400 = PC2-3200
  • DDR2-533 = PC2-4200
  • DDR2-667 = PC2-5300
  • DDR2-800 = PC2-6400
  • DDR2-1066= PC2-8500

DDR3:
  • DDR3-800 = PC3-6400
  • DDR3-1066 = PC3-8500
  • DDR3-1333 = PC3-10600
  • DDR3-1600 = PC3-12800
  • DDR3-1866 = PC3-14900
  • DDR3-2133 = PC3-17000

Keterangan tabel detailnya adalah sebagai berikut ini:

Std Nm= Standard Name
Mem Clk= Memory clock(MHz)
Cy Tm= Cycle time[4](ns)
Bus Clk= I/O bus clock(MHz)
Dt Rt= Data rate(MT/s)
Volt= VDDQ(V)
Mod Nm= Module name
PTR= Peak transfer rate(MB/s)
Tim= Timings
CAS Lat= CAS latency(ns)


DDR1:
Std Nm
Mem Clk
Cy Tm
Bus Clk
Dt Rt
Volt
Mod Nm
PTR
Tim
DDR-200
100
10
100
200
2.5±0.2
PC-1600
1600
DDR-266
133?
7.5
133?
266?
PC-2100
2133?
DDR-333
166?
6
166?
333?
PC-2700
2666?
DDR-400A
DDR-400B
DDR-400C
200
5
200
400
2.6±0.1
PC-3200
3200
2.5-3-3
3-3-3
3-4-4

DDR2:
Std Nm
Mem Clk
Cy Tm
Bus Clk
Dt Rt
Md Nm
Peak transfer rate(MB/s)
Tim
CAS Lat
DDR2-400B
DDR2-400C
100
10
200
400
PC2-3200
3200
3-3-3
4-4-4
15
20
DDR2-533B
DDR2-533C
133?
266?
533?
PC2-4200*
4266?
3-3-3
4-4-4
11¼
15
DDR2-667C
DDR2-667D
166?
6
333?
666?
PC2-5300*
5333?
4-4-4
5-5-5
12
15
DDR2-800C
DDR2-800D
DDR2-800E
200
5
400
800
PC2-6400
6400
4-4-4
5-5-5
6-6-6
10
12½
15
DDR2-1066E
DDR2-1066F
266?
533?
1066?
PC2-8500*
8533?
6-6-6
7-7-7
11¼
13?

DDR3:
Std Nm
Mem Clk
Cy Tm
Bus Clk
Dt Rt
Mod Nm
PTR
Tim
CAS lat
DDR3-800D
DDR3-800E
100
10
400
800
PC3-6400
6400
5-5-5
6-6-6
12 1?2
15
DDR3-1066E
DDR3-1066F
DDR3-1066G
133?
7 1?2
533?
1066?
PC3-8500
8533?
6-6-6
7-7-7
8-8-8
11 1?4
13 1?8
15
DDR3-1333F*
DDR3-1333G
DDR3-1333H
DDR3-1333J*
166?
6
666?
1333?
PC3-10600
10666?
7-7-7
8-8-8
9-9-9
10-10-10
10 1?2
12
13 1?2
15
DDR3-1600G*
DDR3-1600H
DDR3-1600J
DDR3-1600K
200
5
800
1600
PC3-12800
12800
8-8-8
9-9-9
10-10-10
11-11-11
10
11 1?4
12 1?2
13 3?4
DDR3-1866J*
DDR3-1866K
DDR3-1866L
DDR3-1866M*
233?
4 2?7
933?
1866?
PC3-14900
14933?
10-10-10
11-11-11
12-12-12
13-13-13
10 5?7
11 11?14
12 6?7
13 13?14
DDR3-2133K*
DDR3-2133L
DDR3-2133M
DDR3-2133N*
266?
3 3?4
1066?
2133?
PC3-17000
17066?
11-11-11
12-12-12
13-13-13
14-14-14
10 5?16
11 1?4
12 3?16
13 1?8

* optional
  • CL – Clock cycles between sending a column address to the memory and the beginning of the data in response
  • tRCD – Clock cycles between row activate and reads/writes
  • tRP – Clock cycles between row precharge and activate
  • Fractional frequencies are normally rounded down, but rounding up to -667 is common due to superstition about the number 666.
  • ……DDR3 SDRAM:….Double Data Rate SDRAM III (Quad Edge ‘Clock’ Rate, 1.5v signaling), Third Generation
  • ………PC3-6400 (DDR3-800 SDRAM); Clock Speed: 100MHz, Data Rate: 800MHz, Through-put 6.40GB/s
  • ………PC3-8500 (DDR3-1066 SDRAM); Clock Speed: 133MHz, Data Rate: 1066MHz, Through-put 8.53GB/s
  • ………PC3-10600 (DDR3-1333 SDRAM); Clock Speed: 166MHz, Data Rate: 1333MHz, Through-put 10.67GB/s
  • ………PC3-12800 (DDR3-1600 SDRAM); Clock Speed: 200MHz, Data Rate: 1600MHz, Through-put 12.80GB/s

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