Hynix: GDDR5 with up to 1,750 MHz and 128 MiByte per chip
RAM specialist Hynix introduced a new model of GDDR5 RAM. Due to 54 nm production higher speed and capacity are possible and at the same time the voltage is lowered resulting in an decreased power consumption.
The new Hynix chips reach up to 7 GBit per second and pin - and each RAM chip has 32 pins. This equals 1,750 MHz for the I/O buffer; with Prefetch calculation an effective data transfer rate of 3,500 MT per second is possible. Thus a single memory module could deliver a bandwidth of 28 GByte per second - that's about 41 percent more than the venerable Radeon 9700 delivered on its 256 Bit interface.
A current Radeon HD 4870 that uses GDDR5 could have 1 GiByte video memory with eight of these chips on its 256 Bit interface and thus could have a maximal memory bandwidth of impressive 224 GByte per second; over 94 percent more than the current models.
In contrast to the common improvements of performance Hynix was even able to lower the voltage from previously about 1.5 to 1.35 volt.
When the new chips will be available hasn't been announced yet, but they should be perfectly suitable for efficient DirectX 11 GPUs.