Dell PowerConnect 8024F CPU OIDs

Hi,

I've read a post on this site which suggested these OIDs:

 .1.3.6.1.4.1.674.10895.5000.2.6132.1.1.1.1.4.3.1.2

 .1.3.6.1.4.1.674.10895.5000.2.6132.1.1.1.1.4.3.1.3

 .1.3.6.1.4.1.674.10895.5000.2.6132.1.1.1.1.4.4.0   (rollup of all CPU activity) 

Unfortunately, these OIDs don't work on our switch.

The first two return nothing in snmpwalk, the last one returns this:

"SNMPv2-SMI::enterprises.674.10895.5000.2.6132.1.1.1.1.4.4.0 = Gauge32: 0"

Our system info is as this: Powerconnect 8024F, 5.0.0.4, VxWorks 6.6

The only OID to return a usable result was this:

.1.3.6.1.4.1.674.10895.5000.2.6132.1.1.1.1.4.9.0

However, it returns a string (rollup of all CPU activity).

Please advise, what are the OIDs for 1min/5min CPU activity?

Thank you very much.