Xeon W3520 versus W3530?

[bofors]

Dear XtremeSystems forum:

I am buying a new CPU immediately for a high performance rig with air cooling (Noctua NH-D14).

Should I order a Xeon W3520 or W3530?

The price difference is trivial. Which is likely to be a better overclocker? Are currently available Xeon W3520's not as good as they used to be? eva2000 implies they might not be here:
http://forums.overclockers.com.au/sh...0&postcount=33

W3530 results are hard to find and some bad Core i7-930 results have been reported:
http://www.xtremesystems.org/forums/...d.php?t=245318

... and some good Core i7-930 results (batch dependent):
http://forums.overclockers.com.au/sh...d.php?t=863733
http://www.xtremesystems.org/forums/...d.php?t=242323

However, HWBOT databases seem to imply that the Core i7-930 is not so bad, and (by extrapolation not by the single DIce result posted) that a new W3530 will be a better overclocker that a W3520:


http://hwbot.org/browseHardwareProce...ubFamilyId=168


http://hwbot.org/browseHardwareProce...ubFamilyId=185