The score results originate from the geometric mean from our RAM benchmark suite consisting of scripted and real-world tests. However, the geometric means don't always tell the whole story: If you're looking for performance in a specific workload or gaming, we recommend looking at the full review of the memory kit you have in mind. Furthermore, we suspect many of you would value performance over anything else. We've got those details in the individual RAM reviews. We use a geometric mean of our memory benchmarking results to keep the ranking objective and discard the intangibles, like aesthetics and overclocking headroom. Our RAM benchmark hierarchy aims to provide a simple database that ranks the best memory kits based on pure performance. The results of all completed tests may be graphed using our colourful custom graphing components.Companies regularly release new memory kits with different speeds, timings, capacities, and ranks, making sifting through seemingly endless models surprisingly time-consuming. The PerformanceTest memory test works will different types of PC RAM, including SDRAM, EDO, RDRAM, DDR, DDR2, DDR3 & DDR4 at all bus speeds. The settings in PerformanceTest allow the user to force the RAM test to run on a particular CPU while accessing the RAM connected to another CPU. Use of NUMA, software applications need to be NUMA aware and coded in a way to prefer the use of local memory over remote memory. Each CPU can have its own low latency local memory, but can still access the remote memory of other CPUs. Non-uniform memory access (NUMA) is a computer memory design used on motherboards with multiple CPUs, where the memory access time depends on the memory location relative to the processor. Swapping to the disk may even be required for very large blocks. In the case where system resources are low, Typically it is possible to see a drop in speed when the block no longerįits in level 1 cache, then again when it no longer fits in level 2 cacheĪnd goes back to main memory. Way it is possible to observe the different access speeds for the different However onĮach subsequent step the size of the requested memory is increased, untilįinally a block close to the size of the system RAM is requested. Memory and runs through the block measuring the access speed. During each step of the test, PerformanceTest requests a block of Like the 'Memory Speed Per Access Step Size' test, is composed of many Very low ) and returns to the requesting program the address of the first Windows allocates the memory to the program ( unless system resources are When a computer program wants to use a section of memory to storeĭata, it makes a request to Windows for the amount of memory it requires. Vary from 1 (continuous sequential access), to 1/65536th of the size of the The size of the block of memory used for this test is one quarter theĪmount of system RAM or 512MB, whichever is smaller. And so on, until a certain maximum step size is reached. Next it runs through the same blockĪgain, except this time it accesses every fourth value and so makes four This occasion, it runs through the block twice in order to access the sameĪmount of data as the initial step. The same block again, except this time it accesses every second value. First, it runs through theīlock of memory sequentially, accessing every value. Large block, of memory in various sized steps. The first test type, 'Memory Speed Per Access Step Size' accesses a Users can choose between two types of test - Memory Speed Per Access Step Size and Memory Speed Per Block Size Memory is designed with this principle in mind and so, we should expect to see a decline in memory access time if we continually request addresses that are far apart from each other. It says that memory addresses which are near each other tend to be referenced close together in time. One principle of memory design is known as Spatial Locality. For instance, running an executable file from a disk causes Windows to copy the file from the disk to memory and then run the executable from there. Windows moves data onto and off of this strip as required. On 32 bit Windows platforms the size of each slot is 32 bits or 4 bytes ( 1 byte = 8 bits ). Each slot has a unique identifying value called its address. The strip is composed of millions (sometimes billions) of slots. You can think of computer memory as a long continuous strip. The Advanced Memory Test is part of the PerformanceTest application, and it is designed to test several factors which affect the speed of which data is accessed in PC memory. Memory benchmark - test your memory speed
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