For it’s Architecturally, the RV790 graphics processor is identical to RV770. The vital specs haven’t changed one bit. It’s still a 55 nm component, though transistor count is up just slightly to approximately 959 million transistors (from 956 million). The GPU is still made up of 800 stream processors, 40 texture units, and 16 ROPs. It still sports a 1 GB GDDR5 frame buffer on a 256-bit memory bus, too. Where it differs most is clock speed—on its core and memory bus. Stock Radeon HD 4870s employed a 750 MHz engine and quad data rate memory running at 900 MHz. This new offering cruises at 850 MHz with 975 MHz GDDR5 memory.
In order to get those elevated frequencies, ATI had to do some work to the GPU’s core. In short, the RV770 consistently had issues clocking beyond a certain point—a fact that was evident in many of our System Builder Marathon overclocking attempts, which generally fell short at the same frequency range.
Here are the product review that I’ve got from Tom’s Hardware site.
Not surprisingly, the 4890 card itself is easily mistaken for a Radeon HD 4870. They’re the same length; they both employ dual-slot coolers and the same dual-DVI plus video output configuration. Subtle differences set the two cards apart, giving away the fact that these two boards are indeed based on different GPUs. And despite the slight increase in load power consumption as a result of the 4890’s higher clock speed, ATI still gets away arming the card with two six-pin auxiliary power connectors.
Overclocking
The principal benefit from moving from HD 4870 to HD 4890 would, in our minds, be overclocking headroom. Stock-to-stock, you’re looking at a 100 MHz frequency increase. However, right out of the gate, ATI’s board partners will be shipping juiced models running a 50 MHz-faster core clock. According to AMD, the new GPU layout should be capable of going even faster than that.
The driver’s Overdrive sub-routine now offers a maximum frequency of 1 GHz, suggesting ATI is fairly comfortable with its enthusiast customers running at that speed. Rather than push our card that high and run the risk of misrepresenting performance with a hand-picked sample, however, we ran our HIS Radeon HD 4890 Turbo sample at its stock 900/975 MHz speeds and compared it to the reference clocks ATI is officially launching.
Upping the core clocks to 900 MHz is good for gains between five and 10% at 2560x1600. One of these factory-overclocked boards undoubtedly enhances the value of ATI’s Radeon HD 4890 versus the 4870 1 GB. However, there will undoubtedly be an additional price premium over the reference cards, too, softening the worth of that extra performance to some degree.
So…after overall review, some might think about how much this product “eating watts”??
Still from T’s H site, they have testing this product and give us their review.
“In the presentation ATI gave on its Radeon HD 4890 pre-launch, it admitted that the board’s load power would be up as a result of the higher clock speeds, to the tune of roughly 30 W. Idle power, however, was said to be down 30 W from 90 to 60 W.
That was a much more significant number in our eyes, since the card would spend a majority of its time in that lower-power state and, as a percentage, the drop from 90 to 60 W was much larger than the load increase from 160 W to 190 W. Nevertheless, our system power measurements do not reflect the idle power consumption improvements. Our load numbers do jump 25 W, which is close to the 30 that ATI cites. But the idle power sitting on the Vista desktop is actually 2 W higher than the Radeon HD 4870 1 GB. The 512 MB card is higher than both, strangely enough. This was one of the original card samples, so it’s entirely possible that it isn’t optimized for power as the retail boards being tested alongside it.
The GeForce GTX 260 Core 216 trumps the entire ATI lineup, both in idle and load power consumption. The 55 nm GTX 285 turns in even better idle results, though its load consumption jumps in response to its increased complexity.”
And now for it Benchmarking results in Worlds in Conflict’s game
And in the end, after watch their battle now let’s compare about this product price.
“Last year, ATI straight-armed Nvidia into slashing the prices on its GeForce GTX 280 and 260 cards, while prices on its own offerings held up extremely well given a lack of new competition.
This year, Nvidia is rolling with a 55 nm die shrink and e-tail prices that might displease shareholders, but certainly give game enthusiasts something to celebrate. With prices on GeForce GTX 260 Core 216s hovering between $180 and $190 online (with rebates dropping that to $160 in many cases), this isn’t June of 2008, where a surprise attack from ATI rocks Nvidia’s world.
At the same time, ATI’s existing Radeon HD 4870 1 GB costs just a tad more than the GTX 260 Core 216 and, in return, is able to best the Nvidia card in a number of our tests. At $170-$180 after rebates from a number of different vendors, that’s a great choice as well.
Yes, the RV790 GPU is a brand new piece of logic. Yes, it does enable quite a bit more headroom in ATI’s architecture. But at the end of the day, the Radeon HD 4890 is good for a fairly consistent 10% performance boost over the card it will succeed (and push down to the $180-ish price point to battle the GTX 260). Will 10% ever mean the difference between turning anti-aliasing on, or stepping up from 1680x1050 to 1920x1200? A thousand times, no. Flip through the benchmarks—at no point does an extra three frames at 30 fps turn into a significantly better gaming experience. And at a $250-ish estimated price point, you’re talking about spending an extra $75 or $80 bucks to get those few frames.
If it turns out that rebates and price cuts push the Radeon HD 4890 somewhere between $200 and $210, it would be deserving of a look and some hands-on time with the re-designed core to push its overclocking limits (Update: ATI is shooting for prices, with rebates, around $220. That's still a little higher than we'd like to see, but certainly more aggressive than the $260 we were initially expecting). Otherwise, the Radeon HD 4870 1 GB and GeForce GTX 260 Core 216 at their current levels are just too good to skip over for what amounts to a very similar experience. At least in the case of the HD 4870, you get the exact same feature set, including DirectX 10.1 support, too.”
So..this is a great product n also for their price bargainer, even some might say that RV 770 with HD 4870 still better for it’s price, coz off same specs for Direct 10.1 support, still this product (HD 4890) is a great product from ATi and recommended for every gamers that need some new experiences without paying more. It’s all up to you. See ya
Reference : Tom’s Hardware
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