Sobat, kadang kita bingung membedakan Ram DDR1, DDR2 dan DDR3. Gimana sih sistem perhitungan clocknya, kelas-kelasnya bagaimana….
Nah bagi sobat-sobat yang masih bingung dengan DDR dan clocknya, berikut ini saya tampilkan tabel clock dan transfer ratenya. Semoga bermanfaat
Ringkasannya:
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
tabel detailnya adalah sebagai berikut ini:
DDR1:
| Standard name | Memory clock(MHz) | Cycle time[4](ns) | I/O bus clock(MHz) | Data rate(MT/s) | VDDQ(V) | Module name | Peak transfer rate(MB/s) | Timings(CL-tRCD-tRP) |
|---|---|---|---|---|---|---|---|---|
| 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:
| Standard name | Memory clock(MHz) | Cycle time(ns) | I/O bus clock(MHz) | Data rate(MT/s) | Module name | Peak transfer rate(MB/s) | Timings[2][3](CL-tRCD-tRP) | CAS latency(ns) |
|---|---|---|---|---|---|---|---|---|
| DDR2-400B DDR2-400C |
100 | 10 | 200 | 400 | PC2-3200 | 3200 | 3-3-3 4-4-4 |
15 20 |
| DDR2-533B DDR2-533C |
133? | 7½ | 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? | 3¾ | 533? | 1066? | PC2-8500* | 8533? | 6-6-6 7-7-7 |
11¼ 13? |
DDR3:
| Standard name | Memory clock(MHz) | Cycle time(ns) | I/O bus clock(MHz) | Data rate(MT/s) | Module name | Peak transfer rate(MB/s) | Timings(CL-tRCD-tRP) | CAS latency(ns) |
|---|---|---|---|---|---|---|---|---|
| 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
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
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