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DDR5 RAM will have 4 times the capacity and 2 times the memory bandwidth of DDR4

Like DDR4 and its predecessors, DDR5 is designed to take performance and clock speeds to the next level. DDR5 RAM will also have the same number of pins (batteries) as DDR4, which means it will have 288 pins. However, the layout of the pins will be different. This means that you will not be able to plug in a DDR5 module and a DDR4 slot, but will have to properly plug it into the DDR5 slot.

DDR4 has a 16-bank structure with 4 bank groups. Meanwhile, with DDR5, it will have 32 banks allocated to 8 groups of banks. The Burst length of DDR5 is also doubled, from 8 to 16. DDDR5 is also equipped with the Same Bank Refresh function (SBRF), which allows the PC to use the remaining banks while one bank is active.

DDR5 RAM will have 4 times the capacity and 2 times the memory bandwidth of DDR4 | Gaming Gear

Each DDR5 module supports up to 4 times the capacity of DDR4. DDR4 modules will use 16 Gbit chips and reach a maximum capacity of 32 GB. DDR5 will take advantage of 64 Gbit chips, pushing the maximum capacity of a RAM from 32 GB to 128 GB. In addition, in the enterprise sector, DDR5 also has certain improvements such as die stacking, allowing RAM vendors to stack 16 die on a single chip. The result is a Load-Reduced DIMM (LRDIMM) that can hold up to 4 TB of capacity.

DDR5 RAM will have 4 times the capacity and 2 times the memory bandwidth of DDR4 | Gaming Gear

Besides increasing the capacity by 4 times, DDR5 also has higher memory bandwidth than DDR4. For comparison, the official data rate of DDR4 will be from 1600 MTps to 3200 MTps, while DDR5 will be from 3200 MTps to 6400 MTps, which is double that of DDR4. JEDEC specifications can be used for reference, but well-known RAM manufacturers on the market are always looking for ways to improve the performance of their DDR4 RAM modules. Currently, you can find DDR4 RAM kits with data transfer rates up to 5000 MTps, so it is highly likely that DDR5 RAM kits will also exceed 6400 MTps. Therefore, SK Hynix’s ambition to create DDR5-8400 RAM module can also become a reality.

DDR5 RAM will have 4 times the capacity and 2 times the memory bandwidth of DDR4 | Gaming Gear

Still following the previous tradition, DDR5 also has optimized voltage levels, helping it to save more power. Specifically, the DDR5 module will run at a voltage of 1.1V, slightly lower than the 1.2V of DDR4. In addition, DDR5 will have built-in voltage regulators right on the RAM bar, helping the motherboard lighten up but the possibility that DDR5 RAM will also have a higher price.

As expected, the transition to DDR5 RAM will begin in 2021. Server platforms are likely to be the first systems to be equipped with DDR5 and then the mainstream users. On the Intel side, Sapphire Rapids CPUs will support DDR5, while AMD’s, fourth-generation EPYC CPUs (codenamed Genoa) will also support DDR5.

Source: tom’s HARDWARE

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