This is a great comparison, and some huge overclocks.
Just to emphasize, though - you got the OCs on a pitiful 290 (the reference) and the very best 780 (the Lightning). Most 780s will not OC like that.
There are a couple things to note:
First the 290 is on water, not reference air.
20 phase vs 6 phase.
Seems legit.
Marketing matters? Or was his card on LN2?
Classified is 12+2, HoF is 8+2..
Oh and I took my reference 470s to 960 core, those had 5 phases in total with a 215w TDP at 607 MHz.
You can stack as many phases on a board you want, a core will only go so high.
That's just one of the likely huge differences between both cards Reference 290/X are known for being weaksauce for OC. VRMs for once, top binned chips secondly and the list is likely to go on forever. I'd just like to point you the graph where the 780 Lightning goes all the way to 640 watts with the 290 nowhere close to that. If you're trying to compare max OCed numbers this isn't a fair metric by miles.
You could probably sell for a high price to a miner on ebay to even perhaps cover a 780ti. Or you could wait a month for more 290X aftermarket cards, assuming the prices stabilize. If you do opt to sell the reference 290X, i'd do it soon. Miners are still buying, not sure if that pace will maintain.
You're comparing a faster card, which is putting more load on the total system and on air to the draw of water cooled slower cards...
It's just yet another 780 OC > R290/x OC review, not sure how much further I'd read into it than that. OC is lottery, the only guarantee is stock.
No, this is just how data is manipulated to fit agendas.
No, it's not. In Crysis 3 charts the max OCed 290 isn't even a fps lower than the max OCed 780 Lightning and it's pulling 155 (+31%) more watts. If we go by his own testing methodology the 290 wasn't watercooled in that test.
No, this is just how data is manipulated to fit agendas.
On that note, the GK110 with 1.3 volts clocks insanely high. The reference stock BIOS does not allow that high of a voltage, but essentially, 1300mhz+ becomes trivial with 1.3V on the GK110. The point here being, voltage matters more than power phases. If a scant reference GK110 can hit 1300mhz in a trivial fashion with the 1.3V afterburner unlock, i'd expect similar results with Hawaii.
I just don't see how near 1.4V being pumped into Hawaii somehow limits it. Power phases merely provide clean power to the chip and that matters more for LN2 overclocking. And by the way, that's why the lightning has so many power phases. That card is designed from the ground up for LN2 extreme overclocking and the lightning line of SKUs always has been. As far as air or water overclocking, higher voltage generally allows a chip to meet the upper range of its potential. With the GK110, even reference based Titans are hitting 1300mhz with ease using the voltage unlock through afterburner as i've mentioned..
Some people should really revisit a glossary of electrical terms. Voltage is meaningless without the current. As shown here the Lightning is being fed way more and better.
Someone should stop cherry picking graphs.
If the 290 was capable of clocking higher it would be capable of drawing more power.