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Which 939 core is this?

It's a San Diego, E6 stepping. Not sure how it compares to others though. There was a thread on here not long ago that had all the steppings and how they performed. I will see if i can find it for you.
 
Here you go http://forums.overclockers.co.uk/showthread.php?t=17639326&highlight=4000+san+diego .

To get to the point, here's the rundown.

KAB1E - Relatively new stepping, reasonable air overclocker. Expect ~ 2.8GHz
KAB2E – Comes in 2 varieties. The older KAB2E’s from mid-late 2005 are decent overclockers which overclock to around 2.9GHz. The newer 2006 KAB2E’s are overclocking like gems at the moment. An example of this is Crash’s and Krunk Kracker’s, which overclock to around 3-3.1GHz. In general KAB2E’s require a lot of voltage to reach the higher overclocks.
KAB3E - A better overclocker and much rarer stepping than the older KAB2E’s. They still require larger Vcore’s to reach the higher speeds but expect ~ 3GHz.
KABNE – An unusual stepping which is hard to get hold of. It performs similarly to the KAB3E so is capable of ~ 3Ghz.
KABYE – Again a rare 3700+ stepping which performs well. Expect ~ 2.9-3GHz
KABQE – As with the KABNE and KABYE, the KABQE is a scarce 3700+ stepping but actually overclocks better the 2 aforementioned steppings. A typical overclock would be just over 3GHz with low Vcore.
KACAE - Possibly the best chip for air cooling and can reach very high speeds with low voltage. Most KACAE’s will achieve >3GHz, but some steppings (i.e. the 0602GPMW) are capable of 3.2GHz! Unlike the KAB2E’s they do not seem to scale well with Vcore and tend to perform best when at a lower Vcore.
CCBWE - This is and example of an E6 revision 3700+ and is commonly thought of as a Toledo core CPU with one core disabled. A CCBWE will not perform too well on air cooling (around 2.8GHz) but will do very well on sub-zero cooling such as Phase-Change cooling.
CABGE - Old stepping which is not as common lately. Just like the Opteron 146 CABGE they are in general bad overclockers which will usually only reach 2.6GHz-2.7GHz. Fear the cabbage!
KABGE – Similar the cabbage above. They do slightly better and overclock to around ~2.7GHz but still don’t come close to the superior later steppings.
 
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