Overclocking with air cooling
Since the focus of the test is naturally on the newly introduced cooling solution, it should now also be in the foreground for overclocking. Switching to the LN2 BIOS may certainly be a good solution for extreme overclockers to avoid the problems that occur at very low temperatures (cold bug fix), but we are not interested in it in this article anyway. We want to know how far you can go with the usual means of a user to overclock both GPU and RAM without risking instabilities.
Our chip is not really the splendor at first glance with an ASIC value of 66.7, but it does quite well when overclocked. After all, 1250 MHz at 1.25 volts and 1300 MHz at 1.3 volts not only allow short-term benchmarks, but are also stably usable for gaming over longer periods of time or executing stress tests. With the RAM we end at 1500 MHz, from about 1550 MHz there are sporadic errors up to freezing. However, operation at 1500 MHz is always possible in a stable manner.
If you raise the voltage to 1.3 volts or more, you absolutely have to use the original fan profile, otherwise the GPU will scratch at the 90°C mark. Here (and only for this purpose) the very generously designed fan profile from the factory makes any sense at all. However, the Silent profile was still sufficient for our gaming benchmarks and the stress test at 1250 MHz.
Benchmarks in comparison
Since we focus on the cooling system and moreover enough articles about overclocking the Tahiti XT cards have already been published, we will now limit ourselves to just a few benchmarks that we performed at 1250 MHz with the quieter of the two fan profiles in the following. As always, our VGA test system with the Core i7 2600K overclocked to 4.5 GHz is used, and we will sound out whether the further overclocking even brings a noteworthy performance boost.
At around 1100 MHz, we found a limit in various benchmark runs, above which further performance increases occur, but the ratio between increased power consumption and achieved additional performance in the benchmarks becomes so bad that effort and benefit are no longer in proportion. We can now understand why Gigabyte “only” ships the card with a factory clock of 1080 MHz. Values like 1250 or even 1300 MHz are thus possible, but hardly useful for continuous operation if you don’t really need the last ounce of performance for playability or benchmark competitions.
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