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All about DDR4, the next-gen memory coming soon for PCs and mobile devices

Andy Patrizio | June 25, 2014
The two key improvements in DDR4 are power consumption and data transfer speed, thanks to the development of an all-new bus.

New CPU and GPU architectures roil the market pretty much every year--sometimes more than once a year. Yet in spite of the impact that system memory can have on a PC's performance, the industry has relied on the same basic memory architecture for what seems like an eternity--in tech time, at least.

DDR3 SDRAM (the third generation of double data rate synchronous DRAM) was introduced way back in 2007. Carrie Underwood had scored her first Grammy. Russian leader Boris Yeltsin died. And Barry Bonds broke Hank Aaron's home-run record. Now the PC industry is finally preparing to transition to DDR4 memory.

What took so long?

Part of the reason for the long gestation period is that memory manufacturers compete more on price than performance. And unlike the CPU and GPU markets, where just two companies dominate the market, memory standards are developed by a committee: The Joint Electron Devices Engineering Council (JEDEC). If you want a standard to develop slowly, do it by committee (consider how long the IEEE is taking to ratify the 802.11ac Wi-Fi standard).

JEDEC, which consists of every memory maker in the world, started work on the DDR4 spec in 2005--two years before DDR3 even hit the market--but the first test samples didn't appear until 2011. DDR4 memory finally hit the market last year in very limited supply, but the industry finally shifted into high gear around Computex 2014.

What's so great about DDR4? Read on and the truth shall be revealed.

What exactly is DDR4?

There are a lot of deeply technical aspects to DDR4, but we won't dive that far. The two key improvements in DDR4 are power consumption and data transfer speed, thanks to the development of an all-new bus.

DDR3 generally requires 1.5 volts of electrical power to operate. DDR4 needs 20 percent less--just 1.2 volts. DDR4 also supports a new, deep power-down mode that will allow the host device to go into standby without needing to refresh its memory. Deep power-down mode is expected to reduce standby power consumption by 40- to 50 percent.  

Less power draw means less heat and longer battery life, so laptops and servers are expected to be the biggest beneficiaries of the jump to DDR4. Servers can be deployed with as much as a terabyte of memory and they routinely operate 24/7, so the power bills to keep them running--along with the onboard fans and outboard ventilation systems to keep them cool--can be enormous.  

Mid-range and high-end laptops routinely ship with 8GB of memory, so the 20-percent reduction in power consumption is more important for extending battery life than reducing utility bills. The LCD panel remains the biggest power draw, and the CPU eats its share of juice, but every little bit helps.  


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