K7VMM v1.x maximum CPU and HDD supported information as below,
HDD:250G
CPU: AMD Duron 200Mhz FSB CPU - 900 AMD Duron 266Mhz FSB CPU - 1800
           AMD Morgan 200Mhz FSB CPU - 1.1G 
           AMD Athlon 200Mhz FSB CPU - 1.3G AMD Athlon 266Mhz FSB CPU - 1.4G
           AMD Athlon XP (0.18u) 266Mhz FSB CPU - 2100+ AMD Athlon XP (0.13u) 266Mhz FSB CPU - 2200+

No, please don't  mix SDRAM and DDR memory modules at the same time. Otherwise, the motherboard may be damaged.

Please refer to attached file for the pin assignment of USB header on K7VMM V1.2A.

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