Performance Testing, NAS325, PPV2, GFnet, PPV3

[Socaltom]

I decided to do a little comparison testing on the 4 systems I have available. I used p7zip for the CPu benchmarking, and dd ( dd if=/dev/zero of=/test.txt bs=1M count =1000). Here are the results

P7zip ( results mathematically adjusted to 100% CPU where required)
Goflex net 220 MIPS
Pogo V2 224 MIPS
NAS 325 304 MIPS
Pogo V3 ( overclocked to 850mhz) 306 MIPS

dd performance ( different drives were used so this ins't tremendously meaningful)
V2 31.2 MB/s
V3 52.4 MB/s
Goflex Net 70.9 MB/s
NAS 325 97.6 MB/s

I did this benchmarking, because my main reason for buying the 325 was for monitoring IP cameras with motion. It turns out that while the NAS couldn't keep up with 4 cameras ( CPU load was well over 1 most of the time), the V3 system seems to keep up just fine. ( CPU load was below 2 most of the time). As I understand it the load numbers must be considered against the number of CPUs, since the V3 has dual CPUs, it can tolerate a load up to 2, the NAS only has one CPU, so it can only tolerate 1.
Any ideas why the dual CPU has an advantage here?
Thanks
Tom

[WarheadsSE]

Technically it is a dual-issue cpu, and not a dual-core, but either way, more frames simultaneously = less pending on the bus = not blocking up.