To overclock the XFX HD 5750, the ATI Catalyst Control Center will be used since the maximum stable overclock fell under the overall limit of 870MHz core and 1430MHz memory. The XFX HD 5750 overclocked roughly 20% extra on both the core and memory to a nice 845MHz and 1385MHz. Fan control is also possible now in the ATI Overdrive suite. Temperatures were in the low 30's at idle and low 60's at load. The R6 driver overclocked the 5750 without any major hiccups except that clock speed wasn't always properly reported. I used other software to verify that the overclock was where it was suppose to be and it was so this bug is only minor.

http://www.overclockersclub.com/reviews/xfx5750/