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EVGA 560ti 448 classified(non ultra) voltages effect on temperatures and how high you can clock it on lowest voltage

post #1 of 2
Thread Starter 
I'm just making this thread out of curiosity fyi.... I know I didnt run the tests long enough, so if you want to take this with a grain of salt, feel free to..

I believed nvidia default or manufacturer clocks for this chip was 720, after all my tests, it turned out to be 732 -_-.

First, we are going to measure how much the voltage actually affect the temps, with fans on auto with custom fan profile.

720/1950@1.050 volts
338

As you can see, the temperature sits at 71 load.


720/1950@1.025 volts
338

Temps dropped by 1c with a .025 volts decrease


720/1950@1.000 volts
338

Temps dropped another 1c with another .025v decrease.


720/1950@.970 volts
338

Temps dropped another 1c, i think we can start to see a pattern now.


720/1950@.950 volts
338

This time, we see a decrease of 2c on the core with another .025volts drop

720/1950@.9.25 volts
338

This time, dropping the voltage by another .025 doesnt see much difference, compared to before results. It hung bettween 66c and 65c as appose to 66c solid as of last test.


720/1950@.913 volts
338

The card itself wont let me go below .913 volts because that is it's idle voltage and I'm guessing its bios locked. We see a solid 65c on this test.

My conclusion at least for the EVGA GTX 560ti 448 classified non ultra edition is that the card experiences ~1c or gain ~1c for every .025v that is subtracted or added. Why is this significant as some people might ask. Well, according to many forums, it is implied that the temperature changes are more dramatic with every voltage changes. A few degrees(c) in temps changes wont really need to bother about if you are already at a low temp.

This raises new questions for me. If I can achieve a 720mhz clock at idle voltages(.913), is the default voltages of 1.050v for 797mhz vendor OC that high just to play it safe? And are reference voltages that high also just to play safe? And how high can I get a stable clock with when My voltage is on idle clock?


At idle voltages, the highest core clock I can get to stable was 770mhz. Thats with .913 volts on the core! So for EVGA 797mhz factory oc, it wouldnt take more than .925 or .950volt to achieve that overclock! I dont have a screenshot because I accidentally it when deleting my voltages effects on temps screenshot. I am sorry, but they all looked the same.
post #2 of 2
well, to avoid many calls from users that do not grasp what a lot of ocn users can. (overclockers) they will plug it in to the system, fire it up,and play. If evga set the voltage to say rock bottom, they would have fair amount of support calls.
The added minimul voltage is to avoid this and assure stable operation

The voltage is usually a safe tier or two higher than needed.

But good find and info, none the less.
Wet Willy
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Oold man 555
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Wet Willy
(17 items)
 
Oold man 555
(11 items)
 
 
CPUMotherboardGraphicsRAM
i7 920 @4.217 1.24 v's 24/7 Asus p6t6 ws Revolution (full water blocks) GTX 480 SLI @867-1734 samsung 30nm at 2040mhz. 8-9-9-26 1.54v's 
Hard DriveOptical DriveCoolingCooling
OCZ Agility 3 RAID0 lite on dvd burner Raystorm Danger Den 480 Full copper (paralleled)  
OSMonitorMonitorKeyboard
Dual boot, Windows7 64bit/Linux ubuntu64bit 1hpw2207h1680/1050  Sharp 60" LED 120hz s510 
PowerCaseMouseAudio
Ultra 1600w X4 NZXT, Tempest EVO logitech s510 combo Harmon Kardon AVR245 
CPUMotherboardGraphicsRAM
Phenom II X4 B55 m4n82 deluxe ghetto gtx 460 patriot viper 1066 
Hard DriveOptical DriveCoolingOS
some crap sata dvd thermal take big typhoon windows 7 ultimate  
MonitorPowerCase
hp 2207h ultra lsp 750watt cooler master elite 
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