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NVIDIA says that the GeForce GTX 275 will be available for purchase by consumers on April 14th, and that they will cost $249 when they hit the shelves. So there you have it: AMD/ATI, the company that practically invented the paper launch is delivering product almost two weeks before NVIDIA, the company who endlessly poked fun at them about it, even though they are both being "launched" on the same day.
RV790 scales like no other ATI GPU we’ve seen; when ATI told us that 1.0GHz was reachable with 4890, we thought they were referring to a card with exotic cooling or some one-off sample they’d scrounged up in the labs, but we now have no doubt that its achievable with the stock ATI cooler – we didn’t even have to manually crank up the fan speeds in order to hit 1GHz either! In hindsight, it looks like ATI could have introduced an even more extreme 4890 SKU, but it appears they plan to leave that up to their board partners.
In the head-to-head battle between Radeon 4890 and GeForce GTX 275, the 4890 manages to eke out ahead, but it’s definitely a close race.
وتفوق ال HD4890 1GB على ال GTX285 :p
في هذا الإختبار COD5 يتفوق كل من ال HD4890 وال HD4870 1GB على ال GT260 216
Also, some icing on top of the cake is the Radeon HD 4890's tweakability. Looking at the GPU clock frequency, 850, 900, 950 perhaps even 1000 MHz on the core GPU clock is a possibility. It's exactly there where the product really starts to shine. The same can be said about the GDDR5 clock frequency, it's very tweakable and can be clocked a vast amount higher. If you clock it at 950 MHz on the core and 4400~4600 Mhz on the memory, the card will surpass GeForce GTX 285 performance
With all the tweakage in mind, the Radeon HD 4890 will be a bit of a niche product for the really enthusiast gamers out there who just like to overclock and tweak a little. Well, since you are reading this article on Guru3D, that's pretty much means all of you hehe
The card at reference clocks viciously takes the 219 USD ~ 190 EUR GeForce GTX 260 as prisoner
, even the SP216 model is no match whatsoever. All thanks to the faster clocks the 4890 offers, yet also to a tremendous heap of performance increases to be found in the latest Catalyst drivers
!ATI Radeon HD 4890: 1GHz Conquered
من كان يتخيل منافسة ال HD4890 1GB لل GTX285 والتفوق عليه أحياناً كثيرة ؟!:D
كسر سرعة الآن الى 1000 ميجاهيرتز سهل جداً ويعطي أداء مذهل مع كسر السرعة بسبب كفاءته وهذا يعني أن المستخدم سيشعر بفارق إطارات محسوس جداً مع كسر السرعة هذا