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Monday, July 16, 2018

Memory matters

Memory FAQ Topics
Memory matters
Q. How do I know if I need parity, non-parity, or ECC memory?
A. The general rule of thumb in deciding what type of memory you need is to look at what's already installed in your system.

To find out if you have ECC, parity, or non-parity memory, count the number of chips on the module. Divide the total number of chips by three.

If you can evenly divide the number of chips by three, the module is ECC or parity, if not, then it is a non-parity module.

So what if your system does have ECC or parity memory (the chips are evenly divisible by three), how do you know which one you have? One way is to look at the part numbers on the chips of your module. If each chip has the same part number, you have ECC.

If one chip is different, you have parity.

If you are building a PC and deciding which type to use, the following guidelines should help. If you plan to use your system as a server or a similar mission critical type machine, it is to your advantage to use ECC. If you plan to use your PC for regular home, office, or gaming applications, you are better off with non-parity.

Using ECC decreases your PC's performance by about 2%.

Current technology DRAM is very stable and memory errors are rare, so unless you have a need for ECC, you are better served with non-parity SDRAM.

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