You will also see DRAM 'freq' that are much higher i. Feb 18, 29, 86, 3, Tradesman1 :. Through it in there at the end, tried to keep it brief and simple but You must log in or register to reply here. Memory 5 Dec 11, Post thread. Question msi 6gb only 1 fan spinning constantly Started by poliplay Today at PM Replies: Graphics Cards. Question Super giving me worse frames than a ? Started by Small-Change Oct 7, Replies: News Comments. Question GPU does not use it's pci bus?
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What do they mean? What is RAM measured in? And what about ECC and Swap? These both reference and allude to the generation of the RAM and its transfer speed. The number paired after PC refers to the theoretical bandwidth in megabytes per second.
Overclocking increases the RAM's bandwidth. Manufacturers sometimes sell pre-overclocked RAM, but you can overclock it yourself. Just make sure your motherboard supports the higher RAM clock speed! You might be wondering if you can mix RAM modules of different clock speeds.
The answer is that yes, you can, but they'll all run at the clock speed of the slowest module. If you want to use faster RAM, don't mix it with your older, slower modules. You can, in theory, mix RAM brands, but it isn't advisable. You run a greater chance of encountering a blue screen of death or other random crashes when you mix RAM brands or different RAM clock speeds.
You will sometimes see RAM modules with a series of numbers, like These numbers are referred to as timings. The lower the numbers, the quicker the RAM reacts to requests. The first number 9, in the example is the CAS latency.
The CAS latency refers to the number of clock cycles it takes for data requested by the memory controller to become available to a data pin. Weird, right? With a CAS latency of 7 cycles, the total latency is 1. Even if it has a higher CAS of 9 cycles, the total latency is 1. That's why it's faster! For most people, capacity trumps clock speed and latency every time. In most cases, timing and latency are the last points of consideration. ECC ram is used in servers where errors in mission-critical data could be disastrous.
For example, personal or financial information is stored in RAM while manipulating a linked database. You can find out the total data rate of a RAM module by multiplying its frequency by eight. Long past are the days where "K ought to be enough for anybody. The manufacturer, besides guaranteeing that your memory module will achieve the labeled clock rate, also guarantees that you will be able to keep the labeled timings up to the labeled clock.
Now we are going a step further as we will explain in detail each one of the memory timing parameters. It tells us how many clock cycles the memory will delay to return requested data. Thus, for two memory modules running at the same clock rate, the one with the lowest CL will be faster.
Notice that the clock rate here is the real clock rate under which the memory module is running — i. In Figure 4, you can see how CL works. You can even calculate the time the memory delays until it starts delivering data. The period of each clock cycle can be easily calculated through the formula:.
Keep in mind that you need to use the real clock rate, which is half of the labeled clock rate. So, this DDR memory would delay So, while the first data would delay CL clock cycles to exit the memory, the next data would be delivered right after the prior data that has just come out from the memory, not having to wait for another CL cycle.
Each memory chip is organized internally as a matrix. Inside the memory, the process of accessing the stored data is accomplished by first activating the row then the column where it is located. The less time there is between these two signals the better, as the data will be read sooner. The lower this parameter, the faster the memory will be, as it will start reading or writing data earlier.
After data is gathered from the memory, a command called Precharge needs to be issued, closi ng the memory row that was being used and allowing a new row to be activated.
As we learned from the previous page, the Active command starts a read or write cycle. As with the other parameters, RAS Precharge works with the memory real clock which is half of the labeled clock. The lower this parameter, the faster the memory will be, as it will issue the Active command earlier.
As with the other parameters, these two parameters work with the memory real clock which is half of the memory labeled clock. The lower these parameters, the faster the memory will be. RAM Timings Because of timings, two memory modules with the same theoretical maximum transfer rate can achieve different performance levels.
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