SDRAM MEMORY DDR MEMORY and
other types of MEMORY
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Index
There are several types of memory (RAM) on the computers, We try to explain only
the main types. Here we refer the word memory to only to refer to RAM. (RAM stands for
Random Access Memory). Main types of memory on the market currently are
1. DDR II Memory (new faster version of memory )
2. DDR-DRAM or Double data Rate DRAM memory (Most widely used
today- 2004 )
3. DIMM Memory or SDRAM (Not used in current systems)
4. RDRAM or RAMBUS memory (Discontinued)
DDR II DRAM memory
This will most likely replace the current DDR memory in time to come. (2005)
DDR-DRAM or Double data Rate DRAM memory
This is the current type of memory used in almost all computers (March 2004). Variety of
motherboards to support DDR memory is available. They are available in different
speeds like PC2100 (266MHz), PC2700 (333MHz) and PC3200 (400MHz). It may be better to get
the correct speed suitable for the motherboard you have, even though some faster memory
may work happily with older motherboards.
SDRAM DIMM memory is used on most Pentium II, Pentium III, early
AMD Athlon, AMD Duron and Celeron (Socket 370) motherboards. Installation of
DIMM memory is a matter of simply switching off the computer and then unplug the power
chord, touch the metal case of computer to discharge any static electricity. Push the two
holding clips apart. Plug in the new memory module and switching on the computer again. If
there is any old memory chips, it may be better to run the new chip by itself for the
first few days to iron out any problems and compatibility issues. You may plug the old
ones back again if every thing is ok Make sure you push the memory chip firmly into
the motherboard without damaging either the motherboard or the memory chip. You may help
the pushing in by moving the two side clips in at the same time. (If you are not sure, get
the help of an expert)
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Now available in 64 meg/ 128 meg and other sizes . It is easy to carry around and
quick to backup your work and take your work home from school, office or
university. |
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512 Meg - 533Mhz- PC4200
DDR2 memory (Amicroe brand). 
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1024 Meg (1 Gig ) -
533Mhz- PC4200 DDR2 memory (Amicroe brand).
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| JDA258 |
256 Meg - 400Mhz- PC3200
DDR memory (Amicroe brand). (Compatible with most
266MHz and 333Mhz motherboards. 3 year warranty by Amicroe)
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| JDA518 |
512 Meg - 400Mhz- PC3200
DDR memory (Amicroe brand). (Compatible with most
266MHz and 333Mhz motherboards. 3 year warranty by Amicroe)
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| JDA1G |
1024 Meg (1 Gig ) -
400Mhz- PC3200 DDR memory (Amicroe brand). (Compatible
with most 266MHz and 333Mhz motherboards. 3 year warranty by Amicroe)
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| Kingston memory |
There is a wide range of memory products available from Kingston . 400MHz
DDR memory by Kingston is also available. For current prices and availability visit Shopping and prices page |
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Following version of DIMM memory is for main boards with 100MHZ or 133Mhz
system bus including Intel BX chipsets, Via chipsets and SIS chipsets. (Voltage of
operation is 3.3). See details under each item for specific compatibility details. |
| JM256S1 JM256D2
JM512D1 |
256 Meg
PC133 168 pin DIMM memory (single sided) 256
Meg PC133 168 pin DIMM memory (double sided)
512
Meg PC133 168 pin DIMM memory (double sided)
If you are planning to use 256 meg it is always a better option to have it as a
single chip. That way.
- You avoid compatibility issues between memory chips
- You will get the faster speed. (If you have two
memory chips the speed may drop to the slower of the two.)
(Legend Code : L3264PC3-83AHS73C ) is
suitable for
- Packard bell 7450 and other 7000 series
- Packard bell 4433 series and above.
- IBM Personal computer 300PL (
Pentium III 450 and above)
- Also we have used this memory successfully on Mac G3 systems.
(Legend Code : L3264P33-83AHSC3B) is
suitable for
- HP Pavilion 8880 series Computer systems
- Packard bell 7000 series
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RDRAM or RAMBUS memory
This is the type of memory introduced sometime ago with Pentium III and Pentium 4
systems. They are not installed on the motherboards designed for DIMM memory.
They needs motherboards designed for RDRAM. Currently support for RDRAM is withdrawn
by most major manufacturers.
(We do not stock RAMBUS memory) |
All prices include sales tax
Address : Flexisoft Computers, 3A/ 135 Railway av, Werribee Vic 3030 Tel -
(03) 97498111 Fax (03) 9749 8033
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Errors and omissions excepted.