According to sources that spoke on the condition of anonymity to VR-Zone, Intel will begin introducing DDR4 to their high-end server lines in 2014 with desktops to follow a year later.
VR-Zone’s sources say that that Haswell-EX 4-socket platforms will introduce DDR4 in 2014, to accommodate the expected 16 core quad processors that are expected on the motherboard. Mainstream Haswell 4-core systems, however, will remain on DDR3 memory.
DDR4 will have a lower power draw – at 1.2v – as well as enhanced memory parity protection and error recovery.
While DDR4 is expected for desktop systems in 2015, VR-Zone argues it might not matter much:
It’s not as if it may matter much for the mainstream Haswell and Broadwell chips, anyway, since their top GT3 bin L4 cache which we exclusively described here, will sit on a very wide low latency internal MCM bus, and, possibly for GPU use, be able to function as directly addressable scratchpad memory as well. Also, since Haswell has such high FP peak issuing rate, double that of Sandy/Ivy Bridge, with its FMA (Fused Multiply-Add) operations, the extra bandwidth of this L4 memory should be very usable by the CPU as well. In the later generations, DDR4 may help solve the bandwidth problem, but the extra latency cost is not clear yet, though.