Rdram Rambus Memory Rambus RDRAM 184-Pin 232-Pin PC-800  PC-1066  PC-1200
 

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Which DDR RAM to buy?

Which DDR RAM?

You want to purchase an ECS K76SA motherboard, and 256MB of PC2100 or PC2700 DDR RAM. You want to run an AMD Duron 1.3GHz processor on the motherboard's front-side bus (FSB) that runs at 200MHz with this processor installed. You know that both PC2100 and PC2700 DDR RAM run faster than 200MHz, so you want to know if the RAM you purchase will be able to run at the slower bus speed used by the processor.

Even though the processor has a maximum speed (frequency) of 1.3GHz (1300MHz), the effective data transfer rate of the processor is limited to the speed (frequency) of the motherboard's FSB, which in this case, doubled by DDR technology, is only 200MHz. The FSB speed is the speed with which the processor is able to communicate with the rest of the system. It can do its own calculations at 1.3GHz, but, in this case, can only communicate with the rest of the system at 200MHz. This is going to limit the effective speed of the DDR RAM, because the RAM can but won't tranfer data faster than the processor.

The chipsets on AMD Athlon/Duron motherboards allow the RAM bus to run at a different speed from the processor bus.

For example, the base FSB on the above ECS motherboard running a Duron processor is 100MHz, because that is the FSB used by that processor. The processor is able to operate at the DDR (double-data rate), which is 200MHz. (Later Athlon processors use a 133MHz FSB.) If PC133 SDRAM, which runs at 133MHz, is used, the Duron processor has an effective data transfer rate that is 67MHz faster than the RAM, so in this case the slower RAM is creating the bottleneck that is limiting the data transfer speed. But with DDR RAM installed, the processor's effective data transfer speed would be responsible for creating the bottleneck.

Below is a table providing information on the different types of DDR RAM.

Names

Base FSB Speed DDR RAM Speed
PC-1600 or DDR-200 100MHz 200 MHz
PC-2100 or DDR-266 133MHz 266 MHz
PC-2400 or DDR-300 150MHz 300 MHz
PC-2700 or DDR-333 166MHz 333 MHz
PC-3200 or DDR-400 200MHz 400 MHz

If you purchase PC2700 RAM, the Duron 1.3GHz processor runs on a base FSB of 100MHz, doubled to give an effective data transfer speed of 200MHz, while the RAM runs on a base FSB of 166MHz, which is effectively 333MHz using the DDR technology. So, in this case, the processor is creating the bottleneck by having an effective data transfer rate that is 133MHz slower than the RAM.

The motherboard's manual provides the information on the types of RAM that the motherboard can run. You must set the RAM clock speed (in the BIOS, or by setting jumpers on the motherboard) to the speed of the RAM that your purchase. This is 133MHz for PC2100 and 166MHz for PC2700 DDR RAM.

Therefore, if you wanted the RAM speed to match the processor speed, you would install PC1600 DDR RAM. However, you could purchase the highest type of DDR RAM supported by the motherboard. If you decided to upgrade the processor to the highest AMD Athlon processor that it supports, that processor will run on a base FSB of 133MHz, providing an effective data transfer speed of 266MHz. The ECS motherboard supports PC2700 DDR RAM, so if that is installed with the new processor, the effective data transfer rate would be increased from 200MHz to 266MHz, and the bottleneck between the RAM and processor would be reduced from 133Mhz to 66MHz.

The latest AMD XP processors run on a base FSB of 166MHz (DDR 333MHz), so they will transfer data across the system bus at the same speed as PC2700 (DDR 333) RAM. But PC3200 (DDR 400) RAM runs at 400MHz, so the base motherboard FSB would have to run at 200MHz for one of these processors to transfer data across the system bus at the same speed as PC3200 RAM.



16-bit Rambus RDRAM memory (184 pins)
This type of RAM is increasing in popularity. These modules operate at up to 533Mhz speed compared to 133Mhz for SDRAM. Most Pentium 4 systems support RDRAM modules for top performance.
PC800 Rambus RIMM (RDRAM) - 184 pins
64Mb Rambus RIMM Samsung
184pins, PC800, 40ns, 16-bit, MR16R1622DF0-CM8
Manufacturer: Samsung, Warranty: Lifetime.

128Mb Rambus RIMM Samsung
184pins, PC800, 40ns, 16-bit, MR16R1624AF0-CM8
Manufacturer: Samsung, Warranty: Lifetime.

256Mb Rambus RIMM Samsung
184pins, PC800, 40ns, 16-bit, MR16R1628DF0-CM8
Manufacturer: Samsung, Warranty: Lifetime.

512Mb Rambus RIMM Samsung
184pins, PC800, 40ns, 16-bit, MR16R162GDF0-CM8
Manufacturer: Samsung, Warranty: Lifetime.

128Mb ECC Rambus RIMM Samsung
184pins, PC800, 40ns, 18-bit, ECC Error Correction
MR18R1624AF0-CM8, Manufacturer: Samsung
Warranty: Lifetime.

256Mb ECC Rambus RIMM Elpida Stock clearance!
184pins, PC800, 40ns, 18-bit, ECC Error Correction
MC-4R256FKE8D-840, Manufacturer: Elpida
Warranty: 2 years.

256Mb ECC Rambus RIMM Samsung
184pins, PC800, 40ns, 18-bit, ECC Error Correction
MR18R1628DF0-CM8, Manufacturer: Samsung
Warranty: Lifetime.

512Mb ECC Rambus RIMM Samsung
184pins, PC800, 40ns, 18-bit, ECC Error Correction
MR18R162GAF0-CM8, Manufacturer: Samsung
Warranty: Lifetime.
PC1066 Rambus RIMM (RDRAM) - 184 pins - for overclocking

Special offer on Samsung PC1066 RDRAM 184 pins
128Mb, 256Mb, 512Mb

128Mb Rambus PC1066 RDRAM (RIMM2100)
184 pins, 16-bit, 1066Mhz, RIMM2100, 32ns, for Intel
850E chipsets, P/N: MR16R1624DF0-CT9,
Manufacturer: Samsung, Warranty: 10 years.

256Mb Rambus PC1066 RDRAM (RIMM2100)
184 pins, 16-bit, 1066Mhz, RIMM2100, 32ns, for Intel
850E chipsets, P/N: MR16R1628DF0-CT9.
Manufacturer: Samsung, Warranty: 10 years.

256Mb Rambus PC1066 RDRAM (RIMM2100)
184 pins, 16-bit, 1066Mhz, RIMM2100, 32ns
for Intel 850E, P/N: KVR1066X16-8/256,
Manufacturer: Kingston, Warranty: Lifetime.

512Mb Rambus PC1066 RDRAM (RIMM2100)
184 pins, 16-bit, 1066Mhz, RIMM2100, 32ns, for Intel
850E chipsets, P/N: MR16R162GDF0-CT9,
Manufacturer: Samsung, Warranty: 10 years
PC1200 Rambus RIMM (RDRAM) - 184 pins - for overclocking

256Mb Rambus PC1200 RDRAM (RIMM2400) - OCZ New product!
184 pins, 16-bit, 1200Mhz, RIMM2400, 32ns
Suitable for i850E and SIS658 chipsets, non-ECC
Bandwidth 4,8Gb/s Dual Channel,Manufacturer: OCZ Technology, Warranty: Lifetime.

Upgrade Kits (special deals on 2 modules)

128Mb RIMM Upgrade Kit, Samsung
(2x 64Mb modules), 184pins, PC800, 40ns, non-ECC
Manufacturer: Samsung, Warranty: Lifetime.


256Mb RIMM Upgrade Kit, Samsung
(2x 128Mb modules), 184pins, PC800, 40ns, non-ECC
Manufacturer: Samsung, Warranty: Lifetime.

512Mb RIMM Upgrade Kit, Samsung
(2x 256Mb modules), 184pins, PC800, 40ns, non-ECC
Manufacturer: Samsung, Warranty: Lifetime.

1Gb RIMM Upgrade Kit, Samsung
(2x 512Mb modules), 184pins, PC800, 40ns, non-ECC
Manufacturer: Samsung, Warranty: Lifetime.

256Mb ECC RIMM Upgrade Kit, Samsung
(2x 128Mb modules), 184pins, PC800, 40ns, 18 bit, ECC
Manufacturer: Samsung, Warranty: Lifetime.

512Mb ECC RIMM Upgrade Kit, Samsung
(2x 256Mb modules), 184pins, PC800, 40ns, 18 bit, ECC
Manufacturer: Samsung, Warranty: Lifetime.

1Gb ECC RIMM Upgrade Kit, Samsung
(2x 512Mb modules), 184pins, PC800, 40ns, 18 bit, ECC
Manufacturer: Samsung, Warranty: Lifetime .
32-bit Rambus RDRAM memory (232 pins)
32-bit Rambus modules provides two independent memory channels, which means there is no requirement to install these modules in pairs of two.
RIMM3200 modules provide a memory bandwidth of 3,2Gb/s, RIMM4200 provides 4,2Gb/s and RIMM4800 provides an unparalleled transfer rate of 4,8Gb/s.
PC800 Rambus RIMM3200 - 232 pins
256Mb Rambus RIMM PC800 32 bit (RIMM3200)
232 pins, 32-bit, PC800, RIMM3200, 40ns MD16R1628AF0-CM8, non-ECC.
Manufacturer: Samsung, Warranty: Lifetime
PC1066 Rambus RIMM4200 - 232 pins - for overclocking

256Mb Rambus PC1066 32-bit RDRAM (RIMM4200)
232 pins, 32 bit, 1066Mhz, RIMM4200, 32ns
for Intel 850 chipsets, P/N: MD16R1628AF0-CN9
Non-ECC, Manufacturer: Samsung, Warranty: 10 years


512Mb Rambus PC1066 32-bit RDRAM (RIMM4200)
232 pins, 32 bit, 1066Mhz, RIMM4200, 32ns
for Intel 850 chipsets, P/N: MD16R162GDF0-CT9
Non-ECC, Manufacturer: Samsung, Warranty: 10 years

512Mb ECC Rambus PC1066 32-bit RDRAM (RIMM4200)
232 pins, 32 bit, 1066Mhz, RIMM4200, 32ns
for Intel 850 chipsets, P/N: MD18R162GAF0-CN9
ECC Error Correction, Manufacturer: Samsung, Warranty: 10 years
PC1200 Rambus RIMM4800 - 232 pins - for overclocking

256Mb Rambus RIMM PC1200 32 bit (RIMM4800) - OCZ
232 pins, 32-bit, PC1200, RIMM4800, 32ns
4.8 Gb/s transfer, non-ECC, Manufacturer: OCZ, Warranty: Lifetime

 

| What is RAM and what does it do? | Different types of RAM | How to identify the size of RAM modules? | How to install RAM? | Frequently asked questions on computer memory RAM | Computer Memory Upgrade Websites | Mixing different kinds of RAM brands | What is DDR SDRAM and Rambus RAM ? | Which DDR RAM to buy? |

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Offers Rdram rambus memory types PC800, PC1066, PC1200 16-bit, 32-bit non-ECC and ECC, Rambus RIMM Upgrade kits. RDRAM RAMBUS Memory. PC1066 533Mhz, PC800 40ns RAMBUS Memory, RAMBUS PC800 45ns 400Mhz, RAMBUS PC600 Memory Upgrades.

   
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