Clash of the Titans VGA 2014 – ASUS Geforce GTX 780 Ti DirectCU II vs ASUS Radeon R9 290X DirectCU II
Switching to water cooling allowed us to increase the voltage yet again (and again, both GPUs have scaled well with voltage), but due to the high temperature of the water, I couldn’t get very good load temperatures, therefore I could not get good scaling with temperature.
Water cooling can land excellent results if we use water at low temperature, otherwise the differences in the case of GPUs with a huge dissipation surface are not that important when compared to excellent air cooling solutions. We obtained a maximum of 1530MHz for the GTX 780 Ti DC2, a result that pleased me and showcased the very good overclocking potential of this very large GPU.
Hawaii has some problems, it doesn’t offer a nice bench experience, and the measly 1300MHz (taking into account its significantly smaller size in relation to the GK110 GPU, both in terms of surface area and transistor count) points towards possible problems with the architecture, either manufacturing process problems or silicon quality issues. AMD’s next single GPU will probably shed some light on this dilemma and clarify these presuppositions.
GTX 780 Ti DC2
R9 290X DC2
The memory worked really well, the maximum clocks achieved being 2100MHz for 780Ti and 1790MHz for 290X. As stated previously, I was disappointed to see the 290X employ Elpida Memory, but in the end, contrary to expectations, we saw good voltage scaling. However, a DC2 series board should be equipped with the best memory available, as it has been the case in the past, leaving the “second tier components” for the reference cards.