Questions
Q1
Why there is only 512 KB L2 cache size for my TA75M motherboard with A4-3300 or A4-3400 CPU?

BIOS will only display CPU L2 Cache size per core.

Each of CPU core on A4-3300 or A4-3400 has 512 KB of L2 cache size.

Total of 1 MB (1024 KB) L2 cache size for each CPU.