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7970 OC with 550W PSU 32AMPS in +12V rail

Last response: in Overclocking
October 18, 2013 10:58:42 AM

I tried to overclock my 7970. My card is sapphire dualx (blue PCB) and yes I can unlock the voltage.

I can see others getting their OC for as high as 1200MHZ in core and 1700+Memory. Without touching anything on the voltage, mine can unlock 1080 and 1600 respectively. The moment I unlock, in order to get 1125, I have to max out the trixx which is almost at 1.300 reported by GPU.

my PSU is a cooler master Extreme powerplus 550W. I'm using a 3570 non K, 4 sticks of RAM, 3 HDD, and total of 2 Fans.

If I change my PSU, could it be the factor that I can't get the OC stable?

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a b K Overclocking
October 18, 2013 4:44:45 PM

yep, certainly could be. its recommended you have 40A on the 12V rail to provide sufficient power @ reference speeds. overclocking it and raising voltages would push the PSU even further.
a b K Overclocking
October 18, 2013 8:05:50 PM

Yes it may would.You should probably get a PSU with a larger 12v rail amperage.
If it blacks out and reboots..You need a bigger PSU.