Overclockers New Zealand has posted a review on Gainward Ultra/800 Plus GeForce FX 5800 VGA. Here is what they had to say:
"As you can see, Gainward's FX5800 is nearly identical to Compro's offering in every respect, performance, overclockability and package. In fact, most of the FX5800s would be identical, since Nvidia is the sole manufacturer. Hence, there would not be a clear "best" FX5800 choice in the mean time."
Read the rest here