Sometimes, (and I'm not saying that this is the case here) scores generated by benchmarks have more to do with claiming bragging rights and getting that overall feeling of smugness when a system you've built does well against systems built by other people than they do in terms of giving you any really useful information.
Of course that's not the only reason to run benchmarks, if you know what the expected results are for a component then benchmarking that part will help you identify bottlenecks if it is not performing correctly or to see performance gains if it is performing above the curve. I use benchmarking a lot because in my case, when I have spent a lot of money replacing an expensive component, I want to be able to have figures that justify that expense, the bigger the performance gain the better I feel (see smugness above).
Synthetics like 3dMark are useful but they are synthetic tests and don't really have a big bearing in real situations, so if you have games with built in benchmarks that you frequently play it is worth testing with those games too, or simply run the fraps benchmark tool or a similar program to gauge the actual games performance and try and play the same level on each PC when you do, do a few tests on each rig and work out the average that way it will smooth out differences in recorded figures if you are getting scores from actual play rather than repeatable scripted play.
For startup times you can look into your system logs to get an accurate figure on how long it takes for your PC to boot and can be directly compared to other PCs using the same logs.
Here is a list of games with benchmark tools (
taken from this link):
Alan Wake
Aliens vs. Predator
Arma 2
Batman: Arkham Asylum
Batman: Arkham City
BioShock Infinite
Company of Heroes
Crysis
DiRT 3
DiRT Showdown
Doom 3
Far Cry 2
Grand Theft Auto IV
GRID 2
Hard Reset
Hitman: Absolution
Just Cause 2
Lost Planet 2
Mafia II
Metro 2033
Metro: Last Light
Mirror's Edge
Natural Selection 2
Quake III Arena
Quake IV
Remember Me
Resident Evil 5
Resident Evil 6
Return to Castle Wolfenstein
Sleeping Dogs
Sniper Elite V2
Street Fighter IV
Thief
Tomb Raider (2013 version)
Total War: Shogun 2
Unreal Tournament 2004
Warhammer 40,000: Dawn of War 2
World in Conflict