P4S5MG/GL+ v7.0 maximum CPU and HDD supported information as below,
HDD: 250G
CPU: Pentium 4 400Mhz FSB (256K/512K L2 cache) CPU – 2.8G.
           Pentium 4 533Mhz FSB (512K L2 cache) CPU – 2.8G 
           Celeron 400Mhz FSB (128K L2 cache) CPU – 2.6G

Update BIOS V021018 to shows 133/133.
PS: PCB7.0 does support 533MHz, and PCB5.0 does support 400MHz (but doesn't support 133MHz/133MHz). PCB7.0 is fine tuned for 533MHz.

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