The problem with multi-cpu benchmarks, is that they all suck. Quake 3's smp is there, but not mature. Unreal Tournament didn't get it until 2004. If you had a multi-cpu system before the pentium 4 era, you were doing one of two things. SERIOUS graphics design (photoshop, video editing, special effects) or you were running a server of some sort.
I'm going to throw this idea on the wall, and see if it sticks: DIY router. Most people use store bought linksys ones with wi-fi, but I'm talking about putting linux on a machine and using it and a pair of network cards instead. In fact I do this already at home with a pair of 900mhz xeons. The software out there is easy enough to install. As long as you have a basic understanding of networking, you can muddle through it easy enough.
however this would be in 2 parts. part #1 would be the router; #2 would be a 2nd (relatively) high end system. Basically anything dual-core+ with 2 gigabit ethernet ports on pci-express. is what I mean. system #2 could flood the router with data and record how much gets through the system.
The software is already out there. I use Smoothwall as my router. and there are plenty of network benchmark software suites out there, at least one should work fine. Using gigabit network cards will showcase our systems pci-x busses as the standard 32bit/33mhz pci bus will get CRUSHED if you try to pipe 1Gbit of data in and out of it. Even more so if you can get 1gbit FULL DUPLEX. This should be MORE than plenty to accurately show bandwidth and latency of each chipset.
My reasoning for this is 70% wanting to be anonymous on the internet and 30% being able to say I can do it. What with the whole NSA bullcrap going on, I've shifted this project from idle to active. If you haven't looked into Tor, its also a good project to fiddle with.
It is a mistake to think you can solve any major problems just with potatoes.