Mental Ray comparison

I've been meaning to compare lightmap render times with mental ray for quite a while so here are the results for a 1024^2 lightmap. An example of the test scene can be seen in this post.  Direct and indirect light were calculated but I've only shown indirect light below.

Max 2010 / Mental Ray: 28 minutes

Settings: 

Final Gather set to 'High' preset with 1 diffuse bounce.

Lanczos filtering with 1 / 16 samples.

Logarithmic exposure control

Lit with mental ray sun / sky system

My app: 1 minute 30 seconds

Settings: 

3 bounces (total of  roughly 9000 rays per sample point)

 Lit with 1 directional light and HDR environment probe.

System specs.

Vista 64bit 

4gb ram

Intel Core 2 Duo E6850 @ 3.0ghz

Geforce 8800 gtx w/768mb ram