Next month will see the arrival of a new top-of-the-line Nvidia GeForce 8 series GPU, the 8800 Ultra, along with a host of lesser products, it has been claimed.

The 8800 Ultra's speeds and feeds aren't yet known, but it will represent an "overclocked 8800 GTX", according to a report at NGOHQ.com, citing Nvidia partner sources.

The day of the launch isn't known precisely either: some say 17 April, others suggest 28 April is the day Nvidia has down in its diary. Whenever it's released, the 8800 Ultra is almost certainly intended to shore up Nvidia's hold on the high-end of the graphics business against AMD's delayed R600.

The AMD next-generation, DirectX 10 GPU was to have been announced last week, but the event was canned at the last minute.

Meanwhile, some moles maintain Nvidia will announce 8300, 8400, 8500 and 8600 graphics chips alongside the Ultra.