We compare 3 factory overclocked cards again
First, we turn our attention to our three test candidates, because we have compared the MSI GTX 660 Ti Power Edition with cards from Zotac and Gigabyte, two models that are already overclocked significantly higher ex-factory. We specifically chose the Gigabyte GTX 660 Ti Windforce 2X again because it has nearly identical circuitry (but no bugs!) in the area in question, and the Zotac GTX 660 Ti Amp! because it was the fastest card in the roundup to the GTX 660 Ti at the time, at least on paper.
Gigabyte GTX 660 Ti Windforce 2X |
MSI GTX 660 Ti TwinFrozrIV Power Edition |
Zotac GTX 660 Ti Amp! |
|
---|---|---|---|
GPU clock | 1033 MHz |
1019 MHz |
1033 MHz |
Boost clock | 1111 MHz |
1088 MHz |
1111 MHz |
Pixel- Fill rate |
24.8 GPix/s |
24.5 GPix/s |
24.8 GPix/s |
Texture Fill- Rate |
115.7 GTex/s |
114.2 GTex/s |
115.7 GTex/s |
Memory clock | 1502 MHz |
1502 MHz |
1652 MHz |
Memory- Throughput |
144.2 GB/s |
144.2 GB/s |
158.6 GB/s |
3DMark11 and a phenomenon that isn't one at all in the end
The MSI card is clearly behind both contenders on paper in terms of the base clock and the specified Boost clock, so one could assume that this disadvantage would also be expressed in the benchmarks. But far from it, the results surprised us a little:
While the MSI card is still clearly ahead in the Performance Preset despite a nominally lower clock, there is only a small gap in the "Extreme Preset", which can be explained precisely by the fact that the boost clock is now set lower in both cards, while enormous boost clock rates are achieved by the MSI card under less load, which were clearly above all values of the other tested cards. In figures, the whole thing looks like this:
We intentionally did not include the Zotac card in the diagram with the boost clock rates because the boost on this card already stopped working above a certain base load. This also explains the somewhat poorer performance of this card in the overall benchmarks, but is certainly also due to the especially small PCB and the somewhat more modest cooling, because Zotac probably rather focused on the compact appearance of the card.
We were initially impressed by the very high boost performance of the MSI GTX 660 Ti Power Edition and considered this card, together with the quite moderate price in direct comparison to the competitors, to be one of our favorites for this Nvidia model.
First startup problems and an interesting forum feedback
Although the MSI card worked great on our VGA test system, which we also use for charting, we later experienced startup issues when installing it in a closed system for volume and temperature measurements, where the PC simply would not turn on. A power supply change fixed this problem for the time being, so we didn't have any ulterior motives at that moment because the replaced power supply wasn't really a top model.
However, messages and inquiries about exactly this problem increased afterwards, including in one of our forums, where the user "starcraftgod" first reported identical startup problems and was later able to inform us about the possible trigger after his own analysis and measurement. But where exactly was the cause? We had no idea yet that boost luck and boat pitch had a common intersection.
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