"They both throttle". Yeah okay if you say so. One throttles by nearly 300mhz and another barely throttles even with vsync off at 100% GPU load -I've used kepler cards for quite a while now and the throttling is far less of an issue and does not cause a 20% drop in performance. In my personal use, none of my kepler cards have ever throttled more than 2 bins (26mhz) in real world gaming, and that is after 4-5 hours of warmed up use.
Meanwhile, you have the 290X with 40% fan speed throttling by 300mhz. Kepler's boost has variances but it is so minutely small it isn't worth noting, and it doesn't cause more than a 1-2% performance drain at MOST. Furthermore, the boost speed avertised isn't a "holy grail" type of speed, all kepler cards boost WELL PAST the advertised speed listed on the box. For example, the GTX 780 advertises a 914mhz boost, nearly every person i've spoken to boosts past 980 easily. Further, my SC ACX 780 advertises 1020mhz, and it boosts around 1100 out of box without overclocking, and all Kepler GPUs are similar.
The differences with AMD's powertune are:
1) throttling by 200-300mhz as opposed to Kepler's meager throttling of 1-2 bins in the worst scenarios.
2) the boost is an "up to" speed while Kepler's boost is guaranteed and all Kepler GPU cards boost WELL PAST their advertised speed out of box, without overclocking.
You can say both cards have the potential to throttle, but I guarantee one of these cards don't throttle to lose 20% performance. And that ISNT the 290. This is the single reason that AMD's decision to use that cheap shroud is so disappointing - I don't know of any GPU that had this type of variance for low fan RPMs. I know the 5870, 6970, and 7970 sure didn't and I quite liked all of those cards - all of those GPUs could be used at reasonably quiet levels WITHOUT sacrificing performance.
If I say so? No, this is not my opinion. Here's some published results from the site who first exposed the throttling issue.
The gtx-uber cards have been adjusted to simulate cards with custom cooling that would stop throttling. So understand this is not out of box performance for the reference card. It is better than what they are capable of simply by plugging them in and running them in default mode. The GTX non-uber is the actual reference benches.
Hardware.fr said:
As with our previous tests, we ensure to test different solutions taking into account their system power management / frequency / temperature so as to provide you with interesting and relevant results. Our approach at this level is of course not rigid and we adapt according to the product tested.
So this time we have not tested the GeForce GTX reference with two additional fans as was the case during their tests. Instead we have for cons incorporated the results of GeForce GTX 780 and GTX 780 Ti which we call Uber. These GeForce GTX "Uber" match cards able to maintain their maximum frequency (almost) continuously as would the case with a kit watercooling, raising the limits of GPU Boost or as this is exactly the case with many partners models for the 780 GTX, which then benefits from a system more efficient axial cooling. Everything suggests that the latter is also true for the GTX 780 Ti. Present the performance of such models seems to be a better compromise than adding additional cooling in this case, especially as the Radeon R9 290X Uber also ensures to maintain its maximum frequency.
Finally, note that due to the influence of temperature on the results, and the fact that we measure performance on a table benches taking the time to let the temperature / frequency of different cards to stabilize the temperature of the room was controlled and set at 26 ° C for all tests.
So they are actually giving the 780ti the benefit of the doubt that they will offer custom cooling solutions that will stop throttling and adjusting the 780ti to compensate for it's reference cooler's throttling. They are actually being quite kind to do this because stock out of box the 780ti doesn't produce these numbers. It produces the slower results.
Also note this is just one resolution. I chose the middle res of the tests as it seems like the most reasonable. They also do 1080, which I believe wouldn't stress the cards enough in some games, and also 4K, which I think is often unplayable and not as reasonable to expect people to use their cards.
I am rounding off decimals.
I am getting some errors with the images with my browser (Firefox). I sometimes have these issues, I don't know why. I hope all of the images show for you.
HERE'S the link to the article.
290X = 10% slower in quiet mode
780ti = 8% slower with reference cooling
290X = 7% faster than 780ti.
290X = 7% slower in quiet mode.
780ti = 9% slower with reference cooling
290X is 4% faster than 780ti.
290X = 9% slower in quiet mode.
780ti = 5% slower with reference cooling.
780ti is 6% faster than 290X.
290X is 7% slower in quiet mode.
780ti is 8% slower with reference cooling.
290X is 2% faster than 780ti
290X is 5% slower in quiet mode
780ti is 7% slower with reference cooling.
780ti is 9% faster than 290X
290X is 7% slower in quiet mode
780ti is 10% slower with reference cooling
780ti is 9% faster than 290X
290x is 8% slower in quiet mode
780ti is 10% slower with reference cooling
290x is 3% faster than 780ti
290X is 5% slower in quiet mode
780ti is 8% slower with reference cooling
290X is 3% faster than 780ti
290X is 3% slower in quiet mode
780ti is 7% slower with reference cooling
290X is 10% faster than 780ti
290X is 8% slower in quiet mode
780ti is 7% slower with reference cooling
780ti is 2% faster than 290X