Actually, DDR3 and DDR4 are a class of Ram falls under DDR SDRAM category where DDR stands for Double Data Rate. Well, you can now gain an insight to answer the question What DDR3 and DDR4 stand for? Of course, It stands for Double Data Rate Version 3 and 4 respectively.
DDR SDRAM Overview
Okay, Let me start explaining about DDR SDRAM. Have Fun.
DDR Ram is a class of Integrated Circuits which evolves from SDR Ram. Since DDR Stands for Double Date Rate. SDR stands for Single data rate. Means in it we get double data transfer rates as compared to SDR. According to this Wiki Article, You can calculate the data transfer rates for a DDR Ram as follow:
With data being transferred 64 bits at a time, DDR SDRAM gives a transfer rate (in bytes/s) of (memory bus clock rate) × 2 (for dual rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus, with a bus frequency of 100 MHz, DDR SDRAM gives a maximum transfer rate of 1600 MB/s.
Right Now, there are three types of RAM which can easily available in the Tech Market these days. Those are DDR3, DDR3L and DDR4.
Finally, Here we compare between DDR3 and DDR4 Ram.
DDR3 VS DDR4: Comparision
| Description | DDR3 | DDR4 | Advantage |
| Chip Densities (Means the number of memory module which meant the number of small black DRAM chips that make up the memory module) | 512Mb-8Gb | 4Gb-16Gb | Larger DIMM Capacities |
| Data Rates (Means the Transfer rate of Data) | 800Mb/s – 2133Mb/s | 1600Mb/s – 3200Mb/s | Migration to Higher-Speed I/O |
| Voltage (Means the Voltage at which it works) | 1,5V | 1,2V | Reduced Memory Power Demand |
| Low Voltage Standard (The Maximum low voltage it can run on) | Yes (DDR3L at 1.35V) | Anticipated at 1.05V | Memory Power Reductions |
| Internal Banks (Internal Banks means that DRAM components, i.e. chips, can be divided in three different organizations: x4, x8, and x16) | 8 | 16 | More Banks |
| Bank Groups ( Bank Group Means that the chips were fused in a such a way that 4, 8 or 16 chips are used to read and write the data simultaneously) | 0 | 4 | Faster Burst Accesses |
| VREF inputs (VREF stands for Voltage reference) | 2 – DQs and CMD/ADDR | 1 – CMD/ADDR | VREFDQ Now Internal |
If you want to read more about DDR Technology you can refer here.
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