Just noticed that the Portugese website Clubedohardware has done a review of the single chip XGI Volari V8 card using the driver 1.04.51.
The card was compared to the 9800XT, 9800 Pro, 5950 Ultra, 5900XT, 5700 Ultra, 9800SE, 9600XT, 9600 Pro, GF4 Ti 4200, 5600, GF4 MX 460, 5500, 5200, MX 4000, 9600 SE and GF2 GTS under 3DMark2001 SE, 3DMark03 build 340, Aquamark 3, Quake III and X2 – The Threat.

Here’s a snip (translation from Portugese):

The Volari V8 of the XGI is an excellent graphics chip for the market it is destined to. Its performance did not disappoint. It was faster of the one than all the simpler graphics chips, such as the GeForce FX 5500, 5600 GeForce FX and GeForce FX 5200. It left the Radeon 9600 eating dust. A really fantastic fact for a company with only one year of life.

The best result of the Volari V8 was the one in Aquamark 3, where this new chip got a similar performance to the one of the Radeon 9800, beating the Radeon 9600 Pro and is not very distant from the performance of the GeForce FX 5700 (that was only 6.89% faster than the Volari V8 in this test).