TRP indicates the time it takes between disabling the current line to enabling access to another line of data. TRCD indicates RAS to CAS delay, which is the time between activation of line (RAS) and column (CAS) where the data is stored in the matrix. These numbers indicate CL, tRCD, tRP, and tRAS numbers respectively. CL timings are indicated in a RAM module via a series of numbers (e.g., 9-9-9-24). Cache LatencyĬache Latency (CL) indicates memory timing. However, they will operate at the frequency of the lower module, and thus the premium you paid for the higher frequency module will not hold much meaning. You can use multiple modules of different frequencies in a system – if they are of the same type. In a real-world scenario, you will achieve a transfer rate that is somewhat lower than the indicated maximum bandwidth.Ī RAM module with higher frequency and bandwidth is generally more expensive. You should, however, keep in mind that this is the theoretical maximum bandwidth. Since DIMM modules transfer 8 bytes at a time, we can see that our DDR4-3200 module in the example above is capable of a peak transfer rate of 3200 x 8 = 25, 600 MB/s. The maximum data transfer rate can be calculated as:ĭata transfer rate = clock speed x bytes transferred. This frequency also indicates the theoretical maximum transfer rate that a memory module can achieve in MB/s. For e.g., a DDR4-3200 is a DDR4 ram module that operates at 3200 MHz. RAM frequency indicates the clock speed that the RAM operates at. However, if you still want to upgrade just the RAM, you can do it if you can procure a suitable module. At this point, we’d like to recommend that you replace your laptop instead. If your laptop is more than a decade old, however, then it’s possible that you might be using DDR or DDR2 RAM. If your laptop is a few generations older, it might be using a DDR3 module. Thus, we can conclude that RAM modules of different types are incompatible with each other.Ĭurrent generation laptops use DDR4, or DDR5 RAM modules. Thus, the placement of notches in the pinout varies. Pinouts in the different modules vary, even when they have the same number of pins. A DDR RAM module has 184 pins, DDR2 and DDR3 have 240, DDR4 and DDR5 come with 288 pins.Įven though you can use different RAMs in different types of slots, there are various other factors to know beforehand. Different RAM types have different maximum bandwidth and data transfer rates, with the newer ones having higher bandwidth and faster data transfer rates.īesides the speed of data transfer, different RAM types are also physically slightly different. RAM types are classified as DDR, DDR2, DDR3, DDR4, and DDR5. The frequency that the RAM module operates at and its latency timing are also important factors to keep in mind while looking for an upgrade. RAM Types, Frequency, and Latencyĭifferent generations of laptops use different types of RAMs, and it is important to identify the type that your laptop is compatible with. RAM module compatibility can be described in terms of RAM type, frequency, and memory latency. If you will be using multiple RAM sticks, they must be compatible with each other as well. Once you’ve determined that you can upgrade the RAM in your laptop, you need to go ahead and procure a suitable RAM module that is compatible with your system. You can check out the article we have, where we have explained in detail to find out if there is a free RAM slot available. Before getting started with the process of upgrading RAM in your laptop, you must first determine whether you have a free SO-DIMM slot available for the upgrade.
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