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| Troubleshooting the System Memory | Performance
I added more memory to the system and performance got worse!
Explanation: Additional system memory was added to the PC, but performance actually
Diagnosis: There are three common causes of this problem. One is misconfiguring the
new memory so that it isn't being used properly. Another is adding slower memory to an
existing system than what is already in it, which can cause the memory subsystem to slow
down slightly. Adding more memory than can be cached by the secondary cache can also lead
to a significant performance hit.
- Make sure that all of the memory is being recognized in
the system. If it isn't, then the upgrade isn't working properly.
- Double-check the setup of the new memory to make sure that it is configured correctly.
Check the BIOS settings, because some BIOSes need settings changed when the memory size
- If you have added enough memory to take you over 64 MB of RAM, say to 80 MB or higher,
your problem may be that your secondary cache can only cache the first 64 MB of memory.
The Intel 430FX, 430VX and 430TX chipsets only cache up to 64 MB of RAM. Any memory above
that is uncached, and accesses to those memory locations will be much slower than accesses
to memory below the 64 MB barrier; see here for more. There is
nothing you can do unless you want to upgrade your motherboard.
- If you have added memory to the system that is either slower in speed than what was
there before (70 ns vs. 60 ns for example) or uses a slower memory technology (adding FPM
memory to a system using EDO already) then your motherboard may slow down all
memory accesses to match the speed of the slower memory, especially if it sets memory
timing by autodetecting the memory speed. This will cause a small performance decrease.
You may be able to change BIOS settings
to get around this.
- Read this section also, which
describes why system performance doesn't generally increase when memory is upgraded.
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