iXBT Labs has posted a review on the AMD Athlon II X4 620 Processor
A quote from the article:
>> AMD Athlon II X4 620 Processor Review
The new quad-core processors will surely seize the popular status from series 700. It's clearly seen on the summary diagram. It turns out that the fourth core can make up for the lack of L3 cache.
>> AMD Athlon II X4 620 Processor Review