Can I flash newBIOS,with only Richland CPU ,A75 FM2 MB,

Err what model/spec is your PSU and mobo...

TDP is max it can draw, so i don't think it will be much a different on between 5700 and 5800K that will overload the PSU .... (but better be sure, try post your spec)

mobo: Biostar TA75MH2

PSU: Delta 200-240V/100-150V, MAX 250W;

will pair with: mem,4G X2 ; HDD, TOSHIBA 1T; and a DVD-RW.

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if this MB can use Richland A10-6700 ,i perfer to Richland than Trinity... just the BIOS problem,i don't have a Trinity APU...

You will be fine, all Richland APU's will be supported by all existing FM2 boards A55 to A85 chipsets. Just check your motherboard manufacturers specs on TDP ratings but from the specs given it will support all Richland parts.

i would if could change the psu, not because the wattage but its because the brand, if anything u get an corsair cx430, will get u safe on the wattage and will be overkill for a apu setup without a dedicated gpu and even with a 6670.

As long as the company who made ur motherboard releases a bios update for the motherboard to support richland apus u should be set, and sometimes cpus will work even tho the company doesnt officially say its supported. My Am3 crosshair IV only officially suports am3+ fx 8150 with beta bios, but can take and use a piledriver 8350

Corsair CX500M is the new bronze line of modular PSU's at low cost from Corsair, very good unit. Bequiet straight Power 530w also bronze rated and modular very quiet units.