Yet, despite this, comparing a 680 lightning at those same clocks 1406mhz / 7ghz VRAM the 780 is substantially faster (I upgraded to the 780, obviously) and it is immediately noticeable when doing any type of game or benchmark in a single card configuration. The GTX 780 smashes it.
I'm going by actual benchmarks that show the GTX 780 to be about 16% faster than the GTX 770 at stock on average, such as the Anandtech benches which I've shown in this thread.
You can gain about 10% performance by overclocking the GTX 770 to about 1250, and another 4% or 5% by going to 1320, which should put it practically at parity with the GTX 780 in the majority of benches, unless you're VRAM or bandwidth limited.
As to the veracity of these benchmarks, I have no personal input as I don't have a GTX 780.
Oh, you say, but I can overclock a 770 to be near a 780. Yeah, then you can overclock the 780 too and then what happens? You're back to where you started. The 780 is still substantially faster. I think these comparisons are worthless - nearly every card can overclock to be close to the worst higher SKU, eg a 770 can overclock to near the level of the worst garbage reference 780. But I assure you, there is absolutely no way a 770, even overclocked, will touch an aftermarket 780 with a similar overclock. I really do hate these type of comparisons "but I can overclock my card to be as fast as X" ? So what? You can overclock the OTHER card too and then you're back right to where you started.
I agree with you, if we're strictly talking about raw performance. But, when you factor in price, then the overclocked GTX 770 is a great alternative because by all reports, they can approach a stock GTX 780 which is already blisteringly fast but costs anywhere from 44% to 62% more..
That's the appeal of overclocking. Getting more performance out of your investment.
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