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-
|
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-
|
100
|
10
|
200
|
400
|
PC2-3200
|
3200
|
3-3-3
4-4-4
|
15
20
|
|
DDR2-533B
DDR2-
|
133?
|
7½
|
266?
|
533?
|
PC2-4200*
|
4266?
|
3-3-3
4-4-4
|
11¼
15
|
|
DDR2-
DDR2-667D
|
166?
|
6
|
333?
|
666?
|
PC2-5300*
|
5333?
|
4-4-4
5-5-5
|
12
15
|
|
DDR2-
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-
|
266?
|
3¾
|
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-
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
source:
http://en.wikipedia.org/wiki/DDR1_SDRAM
http://en.wikipedia.org/wiki/DDR2_SDRAM
http://en.wikipedia.org/wiki/Ddr3
http://www.interfacebus.com/Memory_Module_DDR3_DIMM.html
