Well not only that its a gamble but you have to have the right cpu :P For any of the Athlon series it's rare not unlikely but just rare because they aren't made on the Deneb architecture. So the new Athlons usually unlock to the Propus line.
Yours however is not unlockable. =P Sorry to say this but unless you had the Kuma series then sure but that chip is a bit back on the unlocking period.
His chip is actually a Deneb die, that version of the Athlon X2 5000 was for sale last year. It's the only 45nm Athlon X2, also the only chip defective AM2+ Deneb chips were made from. It's a Phenom II X4 940/920 with the L3 cache locked, 2 cores locked, clock speed dropped to 2.2Ghz, and north bridge dropped to 1.6Ghz.