Having problems with your Dell Dimension C521 PC Desktop ?

Hi Have a Dell Dimension 8200 trying to increase memory Original is 2x128 plus 2xcontinuity Purchased 2x256 and installed but computer will not work.Is it the case that I can only install another 2x128 to match the existing 2x128? Must the original cards always be installed?


Answers :

On a Dell Dimension 8200 there were 2 available bus speeds, 400mhz and 533mhz. The bus speed determines the required RAM speed. Most common 8200's have a 400mhz fsb and require a RAM speed of 45ns or faster (Lower number = faster). Some 8200's have a 533mhz fsb and require a RAM speed of 40ns or faster. The RAM modules must be installed in matched pairs, but the 2 pairs do not have to be equal to each other. (I have 8200 with 2x512mb and 2x64mb - you can also mix ECC and NON-ECC pairs but it will disable ECC) Check the last 2 numbers on your original RAM that works in your system, they will be either 40 or 45. If they are 40 - and 45's won't work, you have a 533mhz fsb. If this is the case, buying the same RAM in a 40ns speed will solve your problem...... Hate to be the one to break it to you, but if you do need 40ns (Rambus) RAM, it is very expensive - about 4 times the price and 1/10th as common as 45ns RAM. Some good deals can be found on ebay - search: rambus 40ns.
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\015\012Hope this helped, and good luck :)
Repair Help & Product Troubleshooting for Dell Dimension C521 PC Desktop

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