Sapphire hd 6570 overclocking to 6670 clock?

[losthopes]

is it okay for me to overclock my 6570 to 6670 clock??
i read in some review that 6570 and 6670 has the same build the only difference is clock
so that mean if i overclock my 6570 to 6670 clock. i have 6670 right??
here my gpuz

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[amuffin]

Not exactly....many 6670's have GDDR5 memory.

 

[losthopes]

i mean i have like 6670 version of gddr3.right