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Apache favoured by 5% the 1866MHz/CL10 RAM with lowest latency among tested sets. Nginx performance was solid across all tested RAM configurations. It's also interesting to check RAM-heavy server applications performance - like databases, HTTP server, cache and data stores. In other benchmarks the difference is lower. Next set of benchmarks are on in memory operations like file compression or compilation:īZIP2 has the biggest spread of results - 15% (9 seconds vs 7,83 seconds). The low level APITEST testing OpenGL4 performance piece by piece in most benchmarks shows the same order. The games used less than 4GB but additional RAM even not in dual channel could play a role too. It looks like key element is the memory bandwidth. DDR3/1333MHz scores 114 FPS, while dual channel DDR4 153 FPS and dual channel DDR3 145 FPS. I used Linux native games like Xonotic, Warsow or UrbanTerror.Īs you can see biggest difference (33%) is in Xonotic, and lowest in OpenArena (likely RAM isn't limiting this game). Usually better performing RAM gives some extra FPS if the game isn't limited by the GPU. It's common to use games for RAM benchmarks. In the Stream benchmark which measures memory bandwidth the results are as expected just like the bandwidth of each configuration: This comparison isn't precise and as you will see in benchmarks - not that accurate.

By that estimation best would be 1866/CL10, then 20% lower 2133/CL/CL9 followed by 2133/CL15. Some benchmark sites divide frequency by CL latency as a rough performance estimate. Kingston DDR4 2133MHz/CL14 2x4GB dual channel Tested RAM configurations are: MemoryĬorsair DDR3 1333MHz/CL9 2x4GB dual channel Ubuntu 15.10 was used as the OS and AMD R9-270 was the GPU. This motherboard allows using up to two DDR3 DIMMs or up to two DDR4 dimms. Performance benchmarksīenchmarks were made on Asrock B150M Combo-G motherboard with i5-6600 CPU. Intel state that using 1,5V DDR3 with Skylake CPU can after some time damage the memory controller making the CPU dead. Motherboard vendors however list DDR3 as also supported. Officially only rare on desktop DDR3L is supported.

To ease the transition to new RAM type Intel also retained DDR3 support in Skylake, but that support is limited. Mainstream support showed up alongside Skylake CPUs. Also DDR4 is more future-proof as it allows for easier design of high capacity and high frequency RAM DIMMs.ĭDR4 is supported by some top-shelf Broadwell CPUs. The new DDR4 RAM is made with newer technologies and works on lower voltage (1,2V) than DDR3 (1,5V and 1,35V for DDR3L) which gives some power savings. On motherboards you have to put RAM in two matched DIMM slots for it to work. The bandwidth between RAM and memory controller can also be doubled by using two identical memory DIMMs working in dual channel mode. The duration of a clock cycle decreases with increasing RAM frequency so actual latency stays at the same level or slightly decreases. The number given as CL latency is a number of clock cycles. 1333 MHZ/PC3-10600 bandwidth is 10,6 GB/s or 1333 MT/s (megatransfers per second), 1600 MHz/PC3-12800 is 12,8 GB/s or 1600 MT/s and 2133MHz is 17 GB/s or 2133 MT/s.ĬAS latency seems to increase with increasing memory frequency, but that's not actually what's happening. Skylake by default will use 2133MHz CL14-15 or some DDR3L.Īs you can see with technology development RAM frequency increases which increases memory bandwidth. Most modern computers before Skylake will use DDR3 memory clocked at 1333 MHZ with around CLMHz with CL11-9. CAS latency is a delay between receiving a command from memory controller to finalizing that command.

The more the better, especially when big amount of data must be transferred. Memory bandwidth determines how fast data can be sent or received from memory. If there is enough RAM then it performance is dictated by memory bandwidth and latency. That will greatly lower performance as RAM memory is much faster. In most extreme case where there is no enough RAM the OS will start using HDD to store data needed by the CPU. RAM can be a crucial component responsible for computer performance. So let us take a look on modern DDR3 and DDR4 performance. With the launch of Intel Skylake CPUs a new generation of RAM was introduced to the mainstream - DDR4. From RAM availability and performance depends how your computer will perform in general. It holds executed program, its data and result. RAM is one of essential computer components.