23 Sep 2009 at 14:48 - 4
It's a good card, no doubts... but, the hype was Halo3 level on almost every forum I went to, and suffice to say, it far from lives up to any of that.
Unfortunately, for ATi, they won't hold a candle to GT300 in any performance category. However, that said, they do have a nice edge on release timing and yields, so that is a plus for them.
One thing that I found very disappointing was that Z process was moved to a lower priority and after the rasterizers (instead of synchronous) in the pipeline. I have a feeling that may impact DX11 performance a bit more than ATi seems to think. However, the increased L1 bandwidth may alleviate some of this. Despite that, I still anticipate at least a 10% performance decrease under DX11 when compared to DX10, based solely on the fact that DX11 thrives on Z buffering to boost efficiency early on. I've got a feeling that will slow poly render down by 25%+, but I haven't really looked full on at the architecture to make that prediction with full confidence.
However! Their authoring and tesselator are beautiful. It is fast, precise, and requires very few passes to do its work. I believe that will be their strongest playing card when it comes to DX11 games (provided they make extensive use of tessellation), and should offer them nice performance gains to make up for the Z buffer fiasco.
I do see one huge caveat with their new texture engine though. Because it is, for all intents and purposes, unrestricted (16K x 16K is silly....), I see driver texture mapping management cropping up as a real reason for slowdowns or even driver crashes. Judging from their focus on Anti Aliasing, this very well may plague their newest Catalyst drivers for quite some time after DX11 games release. You simply don't need that kind of overhead; use the KISS principle whenever possible.
Now, one big feature that I think will be a boon into other customer segments (mainly audiophile) if it works out as intended, is the audio bitstreaming of Dolby DTS-MA and TrueHD. This is a huge boon, considering the state of the audio card market, and complete lack of support via chipsets or decently priced add on cards. Kudos for this feature being thought of, though I think it may not work quite as well as intended, that is normal for a first generation product feature.
In closing, to avoid wall'o'text style, I will say that I am both impressed and disappointed by this launch. The pricing of the HD5870 is decent, and its 5850 little brother is amazingly priced. However, ATi will not take any performance crowns this generation, that I say with certainty. They will do well in the OEM and mainstream market, as well as the budget market. The enthusiast and extreme market, they will fall flat on their face. Don't expect this to be ATi's big ticket to gobbling up market share, but at the same time, don't expect this to be another x800 series in regards to market performance. I'm guessing after GT300 releases, this launch will sit between the HD3000 and HD4000 series launches in success.