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As far as overclocking, thermals and noise go, we can say that all three parameters are satisfactory. PoV / TGT GTX 550 Ti Beast has 112MHz faster GPU clock and 318MHz (effectively) faster memory. Additional overclock was also good, but we couldn’t expect more given that the card already runs at higher than 1GHz.
Additional overclock increased the GTX 550 Ti Beast’s score by about 5 percent.
Core temperatures didn’t go over 75°C and the fan is pretty quiet. 
After our additional overclock, GPU temperature went up by only 2°C and it wasn’t very loud either.