AMD’s Radeon HD 6870 & 6850: Renewing Competition in the Mid-Range Market
by Ryan Smith on October 21, 2010 10:08 PM ESTThe last new game in our benchmark suite is Civilization 5, the latest incarnation in Firaxis Games’ series of turn-based strategy games. Civ 5 gives us an interesting look at things that not even RTSes can match, with a much weaker focus on shading in the game world, and a much greater focus on creating the geometry needed to bring such a world to life. In doing so it uses a slew of DirectX 11 technologies, including tessellation for said geometry and compute shaders for on-the-fly texture decompression.
It’s also one of the few games banned at AnandTech, as “one more turn” and article deadlines are rarely compatible.
Civ 5 has given us benchmark results that quite honestly we have yet to fully appreciate. A tight clustering of results would normally indicate that we’re CPU bound, but the multi-GPU results – particularly for the AMD cards – turns this concept on its head by improving performance by 47% anyhow. The most telling results however are found in the GTX 460 cards, where there’s a clear jump in performance going form the 768MB card to the 1GB card, and again from the 1GB card to the EVGA card. The 1GB GTX only improves on memory, memory bandwidth, and ROPs, greatly narrowing down the factors. No one factor can explain our results, but we believe we’re almost simultaneously memory and geometry bound.
With that in mind, this is clearly a game that benefits NVIDIA’s GPUs right now when we’re looking at single-GPU performance. This likely comes down to NVIDIA’s greater geometry capabilities, but we’re not willing to rule out drivers quite yet, particularly when a partially CPU-bound game comes in to play. In any case NVIDIA’s advantage leads to their wiping the floor with AMD here, as even the mere GTX 460 768MB can best a 5870, let alone the 6800 series.
Crossfire changes things up, but only because NVIDIA apparently does not have a SLI profile for Civ 5 at this time.
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Ryan Smith - Friday, October 22, 2010 - link
In case it isn't obvious from the slipshod organization of the article, we didn't quite get it done on time. We had less than a week to put this article together when normally for an article of this size it takes 2 weeks. Check back in the morning, everything on Eyefinity, DP1.2, etc will be up by then.counter03 - Friday, October 22, 2010 - link
i am quite interested in that 'mst hub'.is there any available product now?well,i just find nothing with google.wolrah - Friday, October 22, 2010 - link
The card still has two TMDS clock generators. This means only two DVI/HDMI displays can be driven off the card at one time, no matter what connection. With that in mind, I wouldn't be surprised if the card doesn't even support passive adapters as there is literally no good reason to ever use them. You already have two native ports, so with a maximum of two DVI displays that's that.Regardless of if passive adapters are supported, you'll still need active adapters or native DisplayPort on your display to run three or four monitors off this card.
Supposedly it also supports DisplayPort daisy chaining, so possibly when monitors arrive that have an out port it may handle more than four displays, but again only a maximum of two can be DVI/HDMI without active adapters.
ninjaquick - Monday, October 25, 2010 - link
DP support shouldn't be a problem since I've seen quite a few monitors coming out with DP in and some with I/O.Abot13 - Saturday, October 23, 2010 - link
With the 6800 series the cards can support up to 6 monitors in Eyefinity. The DP ports can use a DP hub or the monitors can be chained with DP. Either way the max is 6 monitors per card.ol1bit - Thursday, October 21, 2010 - link
The naming stinks, but I can see how these cards will be a big Christmas season for AMD.So people that don't the new naming scheme will rush out an buy the bigger names. Smooth Marketing Move.
Well, if the 6900's launch next month, that will be fun to see.
Zokudu - Thursday, October 21, 2010 - link
You removed Left 4 Dead from your benchmarks. Does this mean you won't be replacing it with another Source game (ie L4D2 or maybe Portal 2 when that releases)?I know its not 100% perfect but 3 of the top 10 selling games on steam right now are run on the Source engine and the only other ones that share and engine are BF:BC2 and MoH both using Frostbite. I would think that having some form of a Source game in there would be a good idea considering the vast amount of popular games that run on it. I always used the L4D benchmark to compare performance for TF2 and CS:S. in the past.
Otherwise good review and I'm excited for the HD6900 launch next month.
Ryan Smith - Friday, October 22, 2010 - link
By the time Portal 2 comes out, it'll be about the time we refresh our suite anyhow. For the time being the existing Source games run on anything (even the GT 430 got L4D playable at 1680 with 4xAA) so it's not a useful benchmark, especially since there's no guarantee Portal will run that well.AmdInside - Thursday, October 21, 2010 - link
In the 3DTV Play article, you mentioned AMD's 6000 series would challenge NVIDIA in 3D with the 6000 series but I didn't read any info on it in this article. What gives?StevoLincolnite - Friday, October 22, 2010 - link
Also didn't see any mention of the improved crossfire performance either...