Tested on Asus P5E3 Premium at mild volts. I fully expect these to perform better at full benching voltages.
ONLY tested for POST, with the exception of the E8400s (read below) I tested in steps of 5, so e.g. "555" means that 560FSB didn't POST.
Chips:
E6320: 555
E2140: 455
E2160: 450, 455
E2180 460, 465, 465
E4600: 435
The above are all 4 for £10
E6300: 550, 555
E6400: 545
These are £6 each
E8400. I benched wPrime (2 cores enabled!) at 4.6GHz on average air, then tuned for voltage.
1.40v: 12 chips available £6 each
1.375v: 5 chips available. £8 each
Pic:
100% of sale (minus shipping) goes to a local electronics recycling charity. (that's where all these CPUs came from)