Several situations can lead to RAM-related performance problems with a particular machine:
RAM timing is slower than optimal machine spec.
RAM has minor flaws that appear only on detailed testing.
RAM is overheating.
There is insufficient RAM.
In the old days of Fast Page RAM, buying new RAM for your computer was a simple affair. You just needed to know what speed your motherboard supported and the maximum each slot would take. Today, there are many types and speeds of RAM, and the better motherboards may be tolerant of using RAM that does not match the motherboard’s maximum specs. For example, your motherboard may support PC133 RAM but will still work with PC100 RAM. But be aware that you may see performance decreases if you install RAM that is slower than the maximum spec. Some motherboards will even allow you to mix speeds but will default to the slowest RAM installed.
Minor flaws in RAM chips can lead to system slowdowns and instability. The least expensive chips often have minor flaws that will cause your system to slow down or Blue Screen intermittently. Although built-in mechanisms may allow the system to keep working, there is a performance hit when it has to deal with flawed RAM chips.
In the past, no one worried about RAM chips getting hot, because they didn’t seem to generate much heat. But that’s changed with newer RAM types, especially SDRAM. To check for overheating, open your computer’s case, power down, and pull the plug out. Ground yourself and touch the plastic on one of your RAM chips. Ouch! They get pretty hot. If you find that your RAM chips are overheating, you should consider buying a separate fan to cool your memory. If your motherboard doesn’t support a RAM fan, you might be able to get enough additional cooling by installing a fan card that plugs in to a PCI slot.
Of course, one common reason for poor performance that’s related to RAM is simply not having enough of it. Modern operating systems such as Windows 7 and today’s resource-hungry applications, combined with our increasing tendency toward extreme multitasking, result in a need for more RAM. The minimal specified system requirements may not cut it if you’re doing lots of multimedia or running other memory-intensive applications. 32-bit Windows is limited to using 4 GB of RAM, but 64-bit Windows 7 can handle from 8 to 192 GB, depending on the edition. If your system allows, adding more RAM can often increase performance.
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