Dear freesurfers,

i was running Freesurfer on the same subject on two independent Computers.

The first Computer PC1has 2 physical Intel processors with 2 logical each - (dual core) - 1.6GHz with 4Gb Ram and the second PC2 has 2 physical Intel processors with 4 logical - (quad core) - 3 GHz with 8 Gb Ram.

After running on these two Computers - i start at the exactly same time - i got a surprising result: My faster Computer PC2 took 41h to run the subject and the slower Computer took 31h.

I wonder if somebody have some comment on this, because i have no idea what is wrong ( When i have the Linux System Monitor on, watching the CPU History, it seems that the slower PC hat a more effective occupation/usage than the faster - switching faster between one CPU and the other one...)

Another small question:

In the final segmentation table, i noticed that there are some small diferences between the results of PC1 and PC2: for ex.:

PC1:ctx - rh-caudalmiddle frontal = 5029 5029

PC2:ctx - -"- 5360 5360

, so a diference of ~6%. I guess these are variations due to the algorithm..

Are there some established limits for that diferences?

Thanks for help,

Thomas