There are so many different types of RAM, and to the untrained eye these varying memory chips may look indistinguishable from one another. This page is designed to help you figure out the type of RAM your computer uses. The easiest way to determine your RAM requirements is to use the Crucial Memory Scanner tool.
Using the Crucial Memory Scanner you will be able to find the right memory for your computer or motherboard in 3 Easy Steps. GUARANTEED!
Visit the Crucial Memory Scanner homepage here: Crucial Memory Advisor Tool
Five questions you need to know before performing a RAM upgrade:
- How many RAM slots do you have altogether?
- How many RAM slots are free?
- What is the maximum amount of RAM the motherboard will address?
- What is the maximum size of each memory module you can fit into a slot?
- Is dual channelling supported?
Here's how a typical timing specification might look:
- The first number (2) is CL, the CAS Latency. This value has the most effect on system performance. It is usually 2, 2.5 or 3 for DDR memory.
- The second number (3) is TRCD, the RAS to CAS delay. Not as critical as CL, it is usually 2,3 or 4 for DDR memory.
- The third number (2) is TRP, the RAS Precharge delay. This value has similar effects to TRCD.
- The fourth number (6) is TRAS, the Active to Precharge delay. This value affects stability more than performance. Typically between 5 and 8 for DDR memory.
- The last figure (1T) is the Command Rate and is often omitted, as it is almost always 1T. For slow RAM it would be 2T. Strangely some overclockers get very good results by deliberately setting the Command Rate to 2T even with low latency RAM as it allows them more flexibility when tweaking the other latencies and bus speeds.
Note that the numbers are valid only for the rated clock speed and will also be quite different for different types of RAM.
"640K should be enough for anybody." - Bill Gates 1981
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