Half Life 2 GPU Roundup Part 1 - DirectX 9 Shootout
by Anand Lal Shimpi on November 17, 2004 11:22 AM EST- Posted in
- GPUs
Turning on Anisotropic Filtering
For the most part Half Life 2 doesn’t absolutely beg for anisotropic filtering to be enabled, but there are definitely a few situations where image quality could be improved by turning it on.
Looking at the peach colored metal platform towards the right of the images before you can see some of the benefits of anisotropic filtering in Half Life 2:
Aniso Disabled
8X Aniso Enabled - ATI
8X Aniso Enabled - NVIDIA
So there's definitely an improvement with 8X anisotropic filtering enabled but the difference in image quality between ATI and NVIDIA is tough to quantify. The two look quite similar in our opinion, with ATI getting the nod for slightly better image quality (the difference is quite subtle).
One issue we found in Half Life 2 with anisotropic filtering enabled is that the amount of resulting texture shimmering was borderline unbearable. The shimmering was worse on NVIDIA cards than on ATI cards, but it was definitely present on both. Part of the cause of the shimmering was the fact that all modern ATI and NVIDIA cards have resorted to a less ideal method of distance calculation for anisotropic filtering, which contributes to the shimmering issues we noticed under Half Life 2. With the release of the GeForce 6 series, NVIDIA moved to a method of anisotropic filtering using a weighted manhattan distance calculation, similar to what ATI had been doing for quite a while. The problem with the weighted manhattan distance calculation is that it is much more sensitive to the orientation of a surface in respect to the viewer, which can cause more of these shimmering issues.
NVIDIA’s NV3x line used a Euclidean distance calculation that was less sensitive to surface orientation and thus reduced some of the shimmering issues we encountered under Half Life 2.
There are some levels in Half Life 2 where enabling anisotropic filtering improves image quality, but then there are others where image quality is improved at the expense of increased texture shimmering. Rest assured that the shimmer occurs on both ATI and NVIDIA cards and it seems that the only way to get around it (unless both ATI and NVIDIA choose to employ different methods of anisotropic filtering) is to leave it disabled if it bothers you enough.
In terms of anisotropic filtering image quality, we just showed that we were hard pressed to find any image quality differences between ATI and NVIDIA’s solutions under Half Life 2. In motion however, NVIDIA’s drivers did seem to cause more texture shimmering than ATI’s with anisotropic filtering enabled.
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nthexwn - Wednesday, November 17, 2004 - link
In reply to Jeff7181 (#14):I have a Radeon 9700 pro with the 4.11 drivers and I'm having the same problems with my LCD (Samsung Syncmaster 710T @ 1280x1024)! Refresh rate is set to 70hz and with vsync I either get 35 (Interleaving frames to every other) or 70 fps (Matching frames to refresh rate)... Since our cards are from different companies I'm guessing it's a problem with the game itself...
I've tried both triple buffering and alternating the DVI frequency (don't know if that would even help) and it doesn't solve the problem...
It's rather irritating because I actually PLAY my games instead of just gawking over the benchmark scores (I'm one of those lucky people that has some free time!), and the screen looks like a Freddy Kruger job without vsync on! :*(
Also, when the game switches between 70 and 35 there is a bit of a stall, which, even though 35fps is still playable can ruin online play in CS:S! Especially since player models running onto the screen tend to temporarily stress the card enough to make it hitch up on me, in which time said player usually caps me in the head and moves on! :*(
I suppose we could type "fps_max 35" or "fps_max 42.5" (assuming it accepts floating values. You could just set your monitor to 80hz and set fps_max to 40) in the console (don't use the "s), but limiting the framerate to those values isn't what I'd call an ideal solution...
Oh well...
GREAT GAME! GREAT HARDWARE! GREAT WEBSITE!
smn198 - Wednesday, November 17, 2004 - link
I'v got a 9800SE 128MB (256bit) card. Would like to know how that compares. I fried my 9500Pro making it into a 9700Pro so that won't do 3D no more (Artifacts then crashes) :(What graphics card which will be tested would have similar performance to a 9800SE (256bit RAM)?
ElMoIsEviL - Wednesday, November 17, 2004 - link
"The one issue I'm struggling with right now is the fact that the X700 XT is still not available in retail, while the X700 Pro (256MB) is. If I have the time I may go back and run some X700 Pro numbers to make this a more realistic present-day comparison."I should post you a picture.. the x700XT is available at futurshop in Canada and has been for about a week now.. :)
Althought not my cup of tea they are selling quite well I'm told.
But then again ATi cards always sell well in Canada.. so well ATi usually cannot fill the demand (with the USA taking soo many of the chips lol).
ElMoIsEviL - Wednesday, November 17, 2004 - link
Well... for one thing the numbers are not even close to what other sites are showing and secondly where's the x800XT PE?It's the card I own (albeit mine is clocked at 650/625).
It's good to see ATi in the lead by such significant margins and that the game can be easilly played at 1600x1200 with 4xAA and 8xAF with an x800XT PE. Also great to see that the game runs well without the final HL2 drivers from ATi (yeah the 4.12's are only interim, the full 4.12's are going to be fully optimised).
The biggest surprise is how well the 6600GT performed although losing convinsingly against the x700XT it still put on a good showing.
BTW, other sites are showing the x800 Pro beating the 6800 Ultra with the same drivers albeit using an AthlonFX-55.
Meh,
Looks like ATi can probably offer even greater performance at lower resolutions according to the 1600x1200 results being soo close to the lower resolutions.
SMT - Wednesday, November 17, 2004 - link
Anand,My flashlight worked throughout Nova Prospekt. Are you sure yours wasn't available?
abravo01 - Wednesday, November 17, 2004 - link
Was the 6800GT used on the test 128 or 256MB? Huge price difference around here: if it was the 128MB, than it's definitely the best buy.Anand Lal Shimpi - Wednesday, November 17, 2004 - link
The AA benchmarks actually used 8X Aniso as well.Take care,
Anand
OriginalReaper - Wednesday, November 17, 2004 - link
on page 8 and 9 you discuss AA and AF, yet on page 10, 11, 12, and 13, you only list 4xAA being used. Did you forget to put 8xAF in the results or did the benchmark only do 4xAA?Thanks.
CU - Wednesday, November 17, 2004 - link
I think an investigative article that shows when what hardware becomes a bottleneck for HL2 would be great. I look forward to it."Any other requests?
Take care,
Anand"
Can you send me all the hardware when you are done testing HL2. :-)
Cybercat - Wednesday, November 17, 2004 - link
Nice, I wanted to know how the 9550 performed, mostly to see how it compares with the FX 5200. Is that 128 bit memory or 64 bit memory interface version? I'm pretty excited about the 6200 as well, since this is finally a budget card that performs better than the Ti4200. The performance leap this gen is spectacular.Overall, I think you left the other guys in the dust with this one.
And on the subject of the X700 Pro, it's kind of an odd card, because with its price range (the 128MB version at about $180, 256MB at $200), it's unclear what card it's competing with. It acts like a fifth wheel in this way. People would much rather buy a X700XT or 6600GT instead since they're in the same general price range. Only thing is, like you said the X700XT isn't widely available yet, making the X700 Pro a stopgap for now, and giving NVIDIA the clear win in the mainstream market until ATI can start shipping out the more competitive card. That's the only thing saving the X700 Pro right now from being completely pointless.