whats the diference between a card that runs at 78 c and 68 c under load

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valleron2010

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i want to buy a gtx 970,and im between palit jetstream and evga superclocked acx2.the jetstream runs at 78 c and evga at 70.so whats the diferrence in performance?is heat affect fps?
 
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JackNaylorPE

JackNaylorPE

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Out of the "Big 4", MSI Gaming and Gigabyte G1 rule the roost followed by Asus Strix and EVGA SC at the bottom..... the new SSC is better but I haven't seen a good rear down on it. If ya wanna get a good sense of how cards differ from one another, read the tear down article here.

http://www.bit-tech.net/hardware/graphics/2014/09/19/nvidia-geforce-gtx-970-review/1

How cool they run is oft just different philosophies on how to set up the fan curve..... MSI for example historically tends to go for lower noise .... Gigabyte tends to go for lower temps. In other instances is how they cool the card ..... for example on the EVGA SC 1 of the 3 heatpipes completely missed the GPU so it ran hotter. After first issuing a statememt that they designed it that way on purpose, they went back and redesigned the card and released it as the SSC.

Galaxy, Jetstream and Zotac have some good clocks on their boards but I have no experience to offer how well they hold up. Last EVGA FTW we had only could run at 10% of the way between the reference setting and the factory overclock.

 
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valleron2010

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yes but my question is the 10 celsius diferrence makes any improvement is performance?
 
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The difference is about 10 degrees Celsius. <---- somebody had to say it.

Real answer: Cooler is better because heat is the biggest limitation on overclocking cooler temps = better overclock and overall lifespan of the card.
 
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JackNaylorPE

JackNaylorPE

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I must not have been clear.... change the fan curve and most often the temp difference disappears.

Cooler is always better but the thermal limit on the 970 is 98C... neither is anywhere near that. It's very likely that the 78C guy just chose to emphasize noise level with their default fan curve as opposed to the cut who increased fan speed and noise for lower temps. One;s betting the lower noise will attract customers, the other's betting on lower temps.

If I run my rad fans at 1200 rpm, my GPUs run under Furmark at 39C ... but I can hear them. At 850 rpm, the GPU hits 44C and it's dead silent..... I limit fan speed to 850 rpm because the 5C is meaningless. If I have a hoist rated at 1000 pounds, will it "perform any better" if I pick up a 700 pound load versus a 780 pound load ? Does it matter ?

I'm not familiar with the cards in question but for example in the 7xx series, Gigabyte got some negative press about the noise from their coolers as compared to say MSI..... so they released a new BIOS which slowed the default fan speed down. They were now "competitive" with MSI on noise, but they lost their 'competitive" advantage on temps. It could be that the cooler on one is 8C better than the other, but it's much more likely that the fan speed on the 70C one is spinning faster and noisier than the 78C one. No way to know without having both and equalizing either rpm or dbA.

 
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