I agree that comparing factory overclocked 780/780Ti to a stock 870/880 makes little sense. At the same time those preliminary scores are somewhat underwhelming so far. In the last 2 weeks I went from being pretty excited about these cards to almost not caring anymore. Why?
AMD path:
Moving from HD5870 $370 card in Sept 2009 to R9 290X ($550) in December 2013 meant that in 3 years, we got almost
3x the performance increase:
http://www.computerbase.de/2013-12/grafikkarten-2013-vergleich/10/
NV path:
Moving from March 2010 GTX480 $500 (using 7850 as a reference) to May 2013 GTX780 $650 meant that in 3 years, we got
2x the performance increase.
http://www.computerbase.de/2013-05/nvidia-geforce-gtx-780-test/3/
I personally went from HD4890 which I got in August 2009 to HD7970 which I purchased in June 2012, which is also at least a
2.5x increase in performance in less than 3 years and triple the VRAM (!), and nearly 3x the performance when looking at 7970 OC vs. 4890 OC. You would get identical results if you upgraded from GTX260 216/275 to 680 instead of 4890 to 7970; so really it doesn't matter if you mixed and matched AMD/NV upgrades along the way:
http://forums.anandtech.com/showthread.php?t=2298406
vs. Now we are supposed to get excited about buying a $400-450 880 that's maybe 5-10% faster than 780Ti or in effect barely 55% faster than 7970Ghz but nearly 3 years later? That's seriously disappointing. Ok so they focused on lowering the power consumption and are constrained by the 28nm node -- I guess more waiting for 20nm GM200 then. I am now slowly becoming convinced that the 880 will not meet my historical upgrade criteria of being 1.75-2x faster than my existing card. After being used to getting 75%-100%+ performance increases with most of my GPU upgrades every 2.5-3 years, I no longer find a next gen card that's 50% faster for $400-450 as anything but disappointing, regardless if it's coming from AMD or NV. Personally, it's just not good enough after nearly 3 years of waiting for a serious upgrade.
Maybe NV will surprise with this one and here is hoping that the leaks are for lower end 860Ti cards. I think I'd rather spend $650 on a GM200 that's 50-60% faster than 780Ti rather than $400-450 on a card that's only 5-10% faster. Taking emotions out of the equation, even the mathematics back this up:
Upgrading to 880:
Base case = R9 280X/7970Ghz/680 OC/770 ~ 100%
880 => project 10% faster than 780Ti = 1.42x1.10 = 156% for $400 (56% faster or paying $7.14 for each 1% increase in performance over Base case)
Waiting for GM200:
GM200 => project 50% faster than 780Ti = 1.42x1.50 = 213% for $650 (113% faster or paying $5.75 for each 1% increase in performance over Base case) <<<winner>>>
http://www.computerbase.de/2014-08/grafikkarten-2014-im-vergleich-sommerausgabe/2/
If 880 is not even faster than 780Ti, then it gets even worse!