Biggest improvement: "The new version of the processor is not only a die shrink, but also includes a new L3 cache. The original version of the Longson 3B chip had a 256KB L2 cache for each core. This was originally thought to be enough for a decent performance, but according to Chen, real life showed that there were too many cache misses that resulted in a performance penalty, as data had to be loaded from main memory.
Therefore the 32nm version includes a shared 8MB L3 cache.
The Inquirer "
That's the cause why they don't sell the original Loongson 3B to customers because the the chip was to hott 50watt TDP and it was to slow to many cache fails.
i checked about a 3b main board in the past after the European seller told me the main-boards are in stock but i get this answer after he checked it in the headquarters :
"After checking with the headquarters, unfortunately the 3B serial main boards are not available for sell, they are wondering if you can take 3A serial main boards?