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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.

 

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DDR SDRAM Memory
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DDR SDRAM Memory RAM


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DDR SDRAM Memory

   PC2100 266MHZ DDR SDRAM Memory

   PC2700 333MHZ DDR SDRAM Memory

   PC3200 400MHZ DDR SDRAM Memory

   200 PIN Laptop DDR SDRAM SODIMM
DDR2 SDRAM Memory

   PC2-6400 DDR2-800 DDR2 SDRAM Memory

   PC2-5300 DDR2-667 DDR2 SDRAM Memory

   PC2-4200 DDR2-533 DDR2 SDRAM Memory

   PC2-3200 DDR2-400 DDR2 SDRAM Memory

   DDR2 SDRAM SODIMM LAPTOP MEMORY
 

 

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Find all types of DDR SDRAM Memory RAM, best quality DDR Memory and DDR2 SDRAM Memory Upgrades. We carry all types of DDR SDRAM speeds including PC2100 266Mhz DDR SDRAM, PC2700 333Mhz DDR SDRAM, PC3200 DDR 400Mhz RAM Memory. We also carry top brand Computer, Server DDR2 RAM, PC2 3200 DDR2 400Mhz Memory, PC2 4200 DDR2 533Mhz RAM, PC2 5300 DDR2-667Mhz RAM, DDR2 800Mhz PC2-6400 Memory RAM and Notebook SODIMM DDR2 RAM.

If you are not sure on which DDR Memory to select, please use our memory scanner to find the exact ram or contact our Live Support for help.

PC2100 266Mhz 184PIN DDR SDRAM Memory DIMM
DDR PC2100 266Mhz 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2100 266Mhz ECC 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2100 266Mhz ECC Registered 256MB DIMM 512MB DIMM 1GB DIMM 2GB DIMM
PC2700 333Mhz 184PIN DDR SDRAM Memory DIMM
DDR PC2700 333Mhz 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2700 333Mhz ECC 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2700 333Mhz ECC Registered 256MB DIMM 512MB DIMM 1GB DIMM 2GB DIMM
PC3200 400Mhz 184PIN DDR SDRAM Memory DIMM
DDR PC3200 400Mhz 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC3200 400Mhz ECC 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC3200 400Mhz ECC Registered 256MB DIMM 512MB DIMM 2GB Kit 2GB DIMM


200 Pin DDR SDRAM Memory SODIMM
PC2100 266Mhz 200PIN DDR SDRAM SODMM
DDR PC2100 266Mhz 256MB SODIMM 512MB SODIMM 1GB SODIMM
PC2700 333Mhz 200PIN DDR SDRAM SODMM
DDR PC2700 333Mhz 256MB SODIMM 512MB SODIMM 1GB SODIMM
PC3200 400Mhz 200PIN DDR SDRAM SODMM
DDR PC3200 400Mhz 256MB SODIMM 512MB SODIMM 1GB SODIMM


Top Selling DDR SDRAM DIMM Desktops Memory

  1Gig (1024MB) DDR SDRAM PC3200 400MHZ DIMM

  1Gig (1024MB) DDR SDRAM PC2700 333MHZ DIMM

  2GB DDR PC2100 266Mhz ECC Registered DIMM

  2GB DDR PC3200 400Mhz ECC Registered DIMM
 

 Top Selling DDR SDRAM SODIMM Notebook Memory

  1GB DDR PC2700 333Mhz SODIMM

  1GB DDR PC3200 400Mhz SODIMM

  512MB DDR PC2700 333Mhz SODIMM

  512MB DDR PC3200 400Mhz SODIMM


PC2 3200 400Mhz 240 Pin DDR2 SDRAM Memory DIMM
DDR2 PC2-3200 400Mhz 512MB DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-3200 ECC 400Mhz 512MB DIMM 1GB DIMM 2GB  DIMM    
DDR2 PC2-3200 ECC Registered 400Mhz 512MB DIMM 1GB DIMM 2GB  DIMM 4GB  DIMM  
PC2 4200 533Mhz 240 Pin DDR2 SDRAM Memory DIMM
DDR2 PC2-4200 533Mhz 512MB  DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-4200 ECC 533Mhz 512MB DIMM 1GB  DIMM 2GB DIMM    
DDR2 PC2-4200 ECC Registered 533Mhz 512MB DIMM 1GB DIMM 2GB DIMM 4GB DIMM  
DDR2 PC2-4200 ECC Fully Buffered 533Mhz 512M DIMM 1GB DIMM 2GB Kit 4GB Kit 8GB Kit
PC2 5300 667Mhz 240 Pin DDR2 SDRAM Memory DIMM
DDR2 PC2-5300 667Mhz 512MB DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-5300 ECC 667Mhz 512MB DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-5300 ECC Registered 667Mhz 512MB DIMM 1GB DIMM 2GB DIMM 4GB DIMM  
DDR2 PC2-5300 ECC Fully Buffered 667Mhz 512MB DIMM 1GB DIMM 2GB Kit 4GB Kit 8GB Kit
PC2 6400 800Mhz 240 Pin DDR2 SDRAM Memory DIMM
DDR2 PC2-6400 800Mhz 512MB DIMM 1GB DIMM


200 Pin DDR2 SDRAM Memory SODIMM
PC2 3200 400Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-3200 400Mhz 512MB SODIMM 1GB SODIMM  
PC2 4200 533Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-4200 533Mhz 512M SODIMM 1GB SODIMM 2GB SODIMM
PC2 5300 667Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-5300 667Mhz 512MB SODIMM 1GB SODIMM 2GB SODIMM