3dfx Interactive - Voodoo Rush

In August 1997, 3dfx released the Voodoo Rush chipset, combining a Voodoo chip with a 2D chip that lay on the same circuit board, eliminating the need for a separate VGA card. Most cards were built with an Alliance Semiconductor AT25/AT3D 2D component, but there were some built with a Macronix chip and there were initial plans to partner with Trident but no such boards were ever marketed.

The Rush had the same specifications as Voodoo Graphics but did not perform as well because the Rush chipset had to share memory bandwidth with the CRTC of the 2D chip. Furthermore, the Rush chipset was not directly present on the PCI bus but had to be programmed through linked registers of the 2D chip. Like the Voodoo Graphics, there was no interrupt mechanism, so the driver had to poll the Rush in order to determine whether a command had completed or not; the indirection through the 2D component added significant overhead here and tended to back up traffic on the PCI interface. The typical performance hit was around 10% compared to Voodoo Graphics, and even worse in windowed mode. Later Rush boards released by Hercules had 8 MiB VRAM and a 10% higher clock speed to close the performance gap.

A rare third version was produced which featured a Cirrus Logic 2D chip. This version fixed the PCI bus collisions and memory interface problems.

Some manufacturers bundled a PC version of Atari Games' racing game San Francisco Rush, the arcade version of which used a Voodoo Graphics chipset.

Sales of the Voodoo Rush cards were very poor, and the cards were discontinued within a year. The company would not attempt another 2D/3D solution again until the release of the Voodoo Banshee in 1998.