CPU at 50% en backburner

[muoto]

Hello,

i got 2 PC's, one dual quad core (vista64, manager and server running) and one dual dual-core (xp64, server running)
when lauching a backburner rendering, i only got 50% CPU usage on the XP64 computer. Any ideas why ?
On the Vista64, it's working at 100% !

edit : i thought it could be the "number of passes", but even if i set it to 4 instead of 8, still the same problem...

Thanks

/muoto

[vlado]

Try to set the following code in the MaxScript listener and see if it works:

renderers.current.system_numThreads=0

Best regards,
Vlado

[muoto]

Hello Vlado,

i tried, it didn't change anything. But it seems related to several scenes that are very heavy(2.5million polys). I tried with a smaller more basic scene, and it works well...
Strange...