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 Post subject: How Fast Is My Memory?
PostPosted: Mon Jan 23, 2006 9:13 am 
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Mobo-fu Master
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Joined: Wed Nov 12, 2003 11:57 am
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Reference chart for standard memory bus speeds:
The older 30-pin memory modules are considered obslolete. The 72-pin DIMMS are still used, but older PC-66 and later models are considered obsolete. A PC-100 can sub for a PC-66, as can a PC-133 sub for lower speeds. Not all modules are backward-compatible. Older memory types are still available, if searching the right source. There may be a voltage difference between older DIMMS and newer ones. Newer models use a lower voltage.

Standard memory speed configurations:
FPM SIMM..60ns@22 Mhz, 1 cycle per clock.. bus width 8 bytes, bus speed 22 Mhz, transfer rate 177 MB/s
EDO SIMM..60ns@33 Mhz, 1 cycle per clock.. bus width 8 bytes, bus speed 33 Mhz, transfer rate 266 MB/s
PC66 DIMM..10ns@66 Mhz, 1 cycle per clock.. bus width 8 bytes, bus speed 66 Mhz, transfer rate 533 MB/s
PC100 DIMM..08ns@100 Mhz, 1 cycle per clock.. bus width 8 bytes, bus speed 100 Mhz, transfer rate 800 MB/s
PC133 DIMM..7/7.5ns@133 Mhz, 1 cycle per clock.. bus width 8 bytes, bus speed 133 Mhz, transfer rate 1,066 MB/s

PC1600 DDR DIMM..DDR200@100 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 200 Mhz, transfer rate 1,600 MB/s
PC2100 DDR DIMM..DDR266@133 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 266 Mhz, transfer rate 2,133 MB/s
PC2400 DDR DIMM..DDR300@150 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 300 Mhz, transfer rate 2,400 MB/s
PC2700 DDR DIMM..DDR333@166 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 333 Mhz, transfer rate 2,667 MB/s
PC3000 DDR DIMM..DDR366@183 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 366 Mhz, transfer rate 2,933 MB/s
PC3200 DDR DIMM..DDR400@200 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 400 Mhz, transfer rate 3,200 MB/s
PC3500 DDR DIMM..DDR433@216 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 433 Mhz, transfer rate 3,466 MB/s
PC3700 DDR DIMM..DDR466@233 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 466 Mhz, transfer rate 3,733 MB/s
PC4000 DDR DIMM..DDR500@250 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 500 Mhz, transfer rate 4,000 MB/s
PC4300 DDR DIMM..DDR533@266 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 533 Mhz, transfer rate 4,266 MB/s

PC2 3200 DDR2 DIMM..DDR2-400@200 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 400 Mhz, transfer rate 3,200 MB/s
PC2 4300 DDR2 DIMM..DDR2-533@266 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 533 Mhz, transfer rate 4,266 MB/s
PC2 5400 DDR2 DIMM..DDR2-667@333 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 667 Mhz, transfer rate 5,333 MB/s
PC2 6400 DDR2 DIMM..DDR2-800@400 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 800 Mhz, transfer rate 6,400 MB/s

RIMM 1200 RIMM-16/PC600@300 Mhz, 2 cycles per clock.. bus width 2 bytes, bus speed 600 Mhz, transfer rate 1,200 MB/s
RIMM 1400 RIMM-16/PC700@350 Mhz, 2 cycles per clock.. bus width 2 bytes, bus speed 670 Mhz, transfer rate 1,400 MB/s
RIMM 1600 RIMM-16/PC800@400 Mhz, 2 cycles per clock.. bus width 2 bytes, bus speed 800 Mhz, transfer rate 1,600 MB/s
RIMM 2100 RIMM-16/PC1066@533 Mhz, 2 cycles per clock.. bus width 2 bytes, bus speed 1,066 Mhz, transfer rate 2,133 MB/s
RIMM 2400 RIMM-16/PC1200@600 Mhz, 2 cycles per clock.. bus width 4 bytes, bus speed 1,200 Mhz, transfer rate 2,400 MB/s
RIMM 3200 RIMM-32/PC800@400 Mhz, 2 cycles per clock.. bus width 4 bytes, bus speed 800 Mhz, transfer rate 3,200 MB/s
RIMM 4200 RIMM-32/PC1066@533 Mhz, 2 cycles per clock.. bus width 4 bytes, bus speed 1,066 Mhz, transfer rate 4,266 MB/s
RIMM 4800 RIMM-32/PC1200@600 Mhz, 2 cycles per clock.. bus width 4 bytes, bus speed 1,200 Mhz, transfer rate 4,800 MB/s
RIMM 6400 RIMM-64/PC800@400 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 800 Mhz, transfer rate 6,400 MB/s
RIMM 8500 RIMM-64/PC1066@533 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 1,066 Mhz, transfer rate 8,533 MB/s
RIMM 9600 RIMM-64/PC1200@600 Mhz, 2 cycles per clock.. bus width 8 bytes, bus speed 1,200 Mhz, transfer rate 9,600 MB/s

Edit: Some additional references..
http://www.2cpu.com/articles/44_1.html?25696&99369
http://www.interfacebus.com/memory_modules.html
http://www.crucial.com/library/quality_page3.asp
http://memory-chips.globalspec.com/


Last edited by Karlsweldt on Tue Feb 28, 2006 5:45 am, edited 1 time in total.

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PostPosted: Mon Jan 23, 2006 9:37 am 
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Black Belt 5th Degree
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Joined: Fri Apr 11, 2003 5:59 pm
Posts: 5791
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That's VERY handy. I'm forever having to frantically look up the equivalents.
TVM

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PostPosted: Mon Jan 23, 2006 10:05 am 
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Black Belt 5th Degree
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Joined: Mon Jul 14, 2003 12:38 pm
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very usefull


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