290X's get 8600 in Firestrike extreme with temps around 45C with a 480 XSPC rad on its own GPU loop with a 4770K @ 4.5Ghz. V2 7990's get around 10,000 with same settings. I had to take the 290X's back out and put the 7990's back in because the 290X's can't support 5 monitors at 144Hz. I will have to wait for either a Eyefinity 6 card or a Lightning edition.
Q. What is a single tech that AMD is currently working on that you don't feel there is enough buzz about? Something possibly overlooked or overshadowed but to which we should really be paying attention?
A. My favorite is the new implementation of PowerTune on the 290X and 290. There's a lot of doom and gloom around the 95C temperature, because people are used to a world where the product is designed to run as cold as possible... but that's not the world we're living in with these units. The doom and gloom is based on an old viewpoint.
95C is the optimal temperature that allows the board to convert its power consumption into meaningful performance for the user. Every single component on the board is designed to run at that temperature throughout the lifetime of the product. If you throttle the temperature down below that threshold, then the board must in turn consume less power to respect the new temperature limit. Consuming less power means lowering vcore and engine clock, which means less performance.
You want to take full advantage of product TDP to maximize performance, and that is accomplished with a 95C ideal operating temperature for the 290 and 290X. Even with a third-party cooling solution, like the Accelero 3 some users have started deploying, the logic of PowerTune will still try to maximize TDP by allowing temperatures to float higher until some other limit is met (voltage, clock, fan RPM, whatever). It's so bloody smart and it kills me that more people don't fully understand it.
They aren't saying it needs to run hot, they are just saying that the 95C threshold is what the card was designed for, and setting the temperature target below 95C will result in less performance due to throttling.Basically it's just "spin" to get people off of the subject of "these run hot as shit with our cheap cooler". There is absolutely no science to it needing to run hot.
Mine runs great at 49C load on water. My vrms do sometimes touch 60C though.
yes... they did
They aren't saying it needs to run hot, they are just saying that the 95C threshold is what the card was designed for, and setting the temperature target below 95C will result in less performance due to throttling.
If you improve the cooling and the cards run cooler it won't negatively impact performance.
What boards have enough pci-e bandwidth to support 4 290s?
There is hard science, hotter electrons move faster! <- sarcasm alert