For those of you rooted Nexus S 4G users, you might want to upgrade your ROM and kernel to one of the fastest combos, CyanogenMod 7 ROM coupled with Trinity kernel overclockable upto 1.544Ghz stable.
Yesterday I was doing some Quadrant on this very setup and getting near 5500 on Quadrant benchmarks. Perhaps you can do better?
For full details and downloads, check out NexusSHacks.com.