41169 - MIG 7 Series Solution Center - Design Assistant - DDR3 ... - Xilinx DDR3 1600 PC3-12800 - Memory Best Practices - Kingston Technology Second, the Kingston KVR16R11D4/8HC modules held up to a 23.6% overclock without a stutter and even passed memtest at these speeds. Semiconductor engineers know that CAS latencies are an inaccurate indicator of performance. DDR3 more or less starts at 1600MHz for mainstream platforms, while DDR4 doesn't go below 2133MHz. The numbers do the talking: GDDR5 memory had a peak data rate of 8GB/s, GDDR5X peaked at 12GB/s, and GDDR6 . Memory bandwidth is one of many metrics customers use to determine the capabilities of a given computer platform. memory - Why are All DDRs' (DDR, DDR2, DDR3) Internal Clock Set to ... Author Achieving maximum memory bandwidth - Code Arcana First, if one has a memory intensive application the Supermicro Hyper-Speed platform shows significant gains over 1600MHz DDR3 today as well as the next-generation 1866MHz registered ECC DIMMs. DDR4 also added a word-line boost supply of 2.5V to provided more efficient power delivery than pumping all the way from 1.2V. Memory capacity vs. memory bandwidth | HBM, GDDR5 and you JEDEC says DDR4/1866 peak transfer rate is 14.93333 GB/s. As a comparison; DDR3 operates between 800 and 2400 MHz with a voltage requirement between 1.5 and 1.65V. In a similar vein, the Radeon 4870 and 4850 achieve 14% and 27% higher 3DMark scores over their bandwidth starved cousins. 400 x 2 (DDR) x 64 (bits) / 8 = 3200MB/s = 3.2GB/s On a graphics card, the memory clock speed you see is after all the multipliers have been applied. Confusion on Calculating Memory Bandwidth? (In Bytes)