According to a latest report from DonanimHaber, NVIDIA's upcoming dual-GPU flagship, the GeForce GTX 590, is all set to release at PAX East 2011 – which takes place between March 11th and March 13th. Prior to PAX East, the GTX 590 will be introduced behind closed doors at upcoming CeBIT 2011 (March 1st to 5th). 

As has been rumoured for quite a while now, the GTX 590 is expected to sport two fully enabled GF110 GPUs. The power consumption is rumoured to be through the roof – likely breaking the PCI-SIG certification limit of 300W. The GTX 590 is certainly going to be an exclusive, ultra-enthusiast product, with limited availability. 

AMD's competitor – the Radeon HD 6990 – which was earlier planned for a December 2010 release, is also expected to finally release some time in March. 

Source: DonanimHaber