Guru3D.com – It is rumored that NVIDIA’s GeForce GT 300 new flagship graphics card won’t arrive until October this year, a source leak with one of NVIDIA’s partners may have hinted to this . They tell the Inquirer that the first actual production models will be ready October 15th following a tape out, or a first submission for manufacturing, in June.
Whether or not NVIDIA will make its target is nonetheless called into question. The company is likely to have the first revision of fully testable silicon on August 1st but may take as much as 3 months after testing to manufacture enough for the first batch, putting an actual release in mid-November at the soonest. Any need to significantly revise the card would likely push the actual release further. Read more…
First specifications of GeForce 350 GTX have been leaked (unfortunately it is not known if they are true).
New weapons of NVIDIA are based on the core GT300. Its made in 55nm technology process, system is equipped with innovations such as unified units which are doubled in amount (now 480), plus (2GB) and accelerated (GDDR5) video memory, and also raised clocks: core – 830 MHz, a unified shaders – 2075 MHz and memory – 1680 (3360) MHz. Memory clocks have not changed and still with a width of 512 bits. Contrary to the expectations of the new GeForce still will not be compatible with DirectX 10.1.
Rumors say that new GeForce GTX 350 will be 30% faster than GeForce GTX 280.

Internet leaks show that in the end of this year market will welcome new NVIDIA graphics card, which has all chances to threaten the current leader, Radeon 4870 X2 from ATI. It will be a high-end GeForce GTX 350, and it boards new chip – GT300, manufactured in 55 nm process technology.
The new GPU will consist of 480 stream processors (formerly leader GT200, includes 240), 64 texture units and 512-bit memory controller. The core GT300 is to be at clock 830 MHz, 2075 MHz shader processors, and memory (GDDR5) – 3360 MHz. In the specifications that GeForce GTX 350 should be more than 50% faster than the current GT200, and this means that it will smash Radeon 4870 X2.
The exact release date or price of a new NVIDIA product is not yet known. GeForce GTX 350, but will certainly not cheap, however, you can expect that it will be for Christmas can be purchased for around 760 $.
EDIT: Rumors say that GT300 core will not support DirectX 10.1