Antec NSK 1380

I built a "samall" system using the Antec NSK 1380 and Gigabyte GA-
MA69GM-S2H motherboard. Over the last few days, its been running
continuously and I've been watching the system and CPU temps and fan
speeds using the BIOS health utility. System temp has gone from 30C
to a high of 43 while CPU temp has gone from 30C to 41C. CPU fan
started out at 1800rpm and gone up to 2250 while the system fan has
stayed constant at 980 rpm. Here's my question - the Antec case and
PSU has a fan connection which I have connected to the MB system fan
SYS_FAN header and I expected the fan speed to increase with system
temp. Any reason why not?

.

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