Hey all - a few weeks ago, forum user Face2Face posted an excellent thread discussing his upgrade from an OC'd HD 7950 to a GTX 780. You can read it here: http://forums.anandtech.com/showthread.php?t=2354937
As I was putting together benchmarks for a review of the GTX 780, I also put together a number of charts just for you guys, following on Face2Face's example of maximum overclock to maximum overclock. The irony here is that both my GTX 670 and GTX 780 reach exactly the same maximum overclock (1215/6800), so this is also a clock-to-clock comparison. Given that the GTX 780 reference clocks are much lower, however, this represents a bigger overclock on the GTX 780 than it does on the GTX 670. For comparison's sake, I also underclocked both cards to reference speeds (GTX 670@1084/6000 and GTX 780@1006/6000) as a baseline. Generally speaking, the GTX 780 is 45% faster than the GTX 670 at reference speeds, the delta remains at factory-overclocked speeds, and at maximum overclock, the GTX 780 is 50% faster, right about what I'd consider a legitimate upgrade.
Note that all clockspeeds shown in the graphs are actual in-game clocks, and I made sure they were constant throughout the runs by keeping the cards under their throttle temp and by upping the power limit when overclocking. Only the GTX 670 FTW as shipped throttled at all, and this is because its default clock speed exceeds the power limit regularly. The maximum overclock of 1215/6800 was achieved using the sky-high 145% power limit, which never led to a throttle.
I even included my HD 7870 in the 3DMark bench for a little extra fun! Anyone catch the VRAM bottleneck on the GTX670? How about the game with the huge CPU bottleneck at 1080p, despite using an i7-4770K@4.4?
Enjoy and discuss!
As I was putting together benchmarks for a review of the GTX 780, I also put together a number of charts just for you guys, following on Face2Face's example of maximum overclock to maximum overclock. The irony here is that both my GTX 670 and GTX 780 reach exactly the same maximum overclock (1215/6800), so this is also a clock-to-clock comparison. Given that the GTX 780 reference clocks are much lower, however, this represents a bigger overclock on the GTX 780 than it does on the GTX 670. For comparison's sake, I also underclocked both cards to reference speeds (GTX 670@1084/6000 and GTX 780@1006/6000) as a baseline. Generally speaking, the GTX 780 is 45% faster than the GTX 670 at reference speeds, the delta remains at factory-overclocked speeds, and at maximum overclock, the GTX 780 is 50% faster, right about what I'd consider a legitimate upgrade.
Note that all clockspeeds shown in the graphs are actual in-game clocks, and I made sure they were constant throughout the runs by keeping the cards under their throttle temp and by upping the power limit when overclocking. Only the GTX 670 FTW as shipped throttled at all, and this is because its default clock speed exceeds the power limit regularly. The maximum overclock of 1215/6800 was achieved using the sky-high 145% power limit, which never led to a throttle.
I even included my HD 7870 in the 3DMark bench for a little extra fun! Anyone catch the VRAM bottleneck on the GTX670? How about the game with the huge CPU bottleneck at 1080p, despite using an i7-4770K@4.4?
Enjoy and discuss!
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