Compute Performance

As always we'll start with our DirectCompute game example, Civilization V, which uses DirectCompute to decompress textures on the fly. Civ V includes a sub-benchmark that exclusively tests the speed of their texture decompression algorithm by repeatedly decompressing the textures required for one of the game’s leader scenes.  While DirectCompute is used in many games, this is one of the only games with a benchmark that can isolate the use of DirectCompute and its resulting performance.

Compute: Civilization V

As our Civilization V compute benchmark is just that, a compute benchmark, so our results aren’t too surprising. This is one of the few compute tests NVIDIA does well at, so the GTX 650 Ti Boost is close to both Radeon cards, and not all that far behind the GTX 660 either.

Our next benchmark is LuxMark2.0, the official benchmark of SmallLuxGPU 2.0. SmallLuxGPU is an OpenCL accelerated ray tracer that is part of the larger LuxRender suite. Ray tracing has become a stronghold for GPUs in recent years as ray tracing maps well to GPU pipelines, allowing artists to render scenes much more quickly than with CPUs alone.

Compute: LuxMark 2.0

Moving on to LuxMark, we quite frankly transition into a more normal compute benchmark pattern for NVIDIA, which sees Kepler flopping. The GTX 650 Ti Boost can’t get even remotely close to a 7770, let alone the 7850. On the NVIDIA side it doesn’t help that since this is a compute benchmark the GTX 650 Ti Boost gains fairly little over the GTX 650 Ti.

Our 3rd benchmark set comes from CLBenchmark 1.1. CLBenchmark contains a number of subtests; we’re focusing on the most practical of them, the computer vision test and the fluid simulation test. The former being a useful proxy for computer imaging tasks where systems are required to parse images and identify features (e.g. humans), while fluid simulations are common in professional graphics work and games alike.

Compute: CLBenchmark 1.1 Computer Vision

Compute: CLBenchmark 1.1 Fluid Simulation

CLBenchmark is much the same as LuxMark, with NVIDIA cards bringing up the rear. The fluid simulation ends up being the more painful of the two benchmarks for the GTX 650 Ti Boost, clocking in at less than 1/3rd the performance of the 7850.

Moving on, our 4th compute benchmark is FAHBench, the official Folding @ Home benchmark. Folding @ Home is the popular Stanford-backed research and distributed computing initiative that has work distributed to millions of volunteer computers over the internet, each of which is responsible for a tiny slice of a protein folding simulation. FAHBench can test both single precision and double precision floating point performance, with single precision being the most useful metric for most consumer cards due to their low double precision performance. Each precision has two modes, explicit and implicit, the difference being whether water atoms are included in the simulation, which adds quite a bit of work and overhead. This is another OpenCL test, as Folding @ Home is moving exclusively OpenCL this year with FAHCore 17.

Compute: Folding @ Home: Explicit, Single Precision

Compute: Folding @ Home: Implicit, Single Precision

NVIDIA still struggles at compute with FAHBench – the move to OpenCL isn’t doing them any favors – but it’s not the blowout that was our last two benchmarks. Interestingly explicit favors NVIDIA more than implicit, which may mean NVIDIA is handling the overhead better than AMD is. Still, any Folding @ Home users will be far better served by AMD than NVIIDA here.

Our 5th compute benchmark is Sony Vegas Pro 12, an OpenGL and OpenCL video editing and authoring package. Vegas can use GPUs in a few different ways, the primary uses being to accelerate the video effects and compositing process itself, and in the video encoding step. With video encoding being increasingly offloaded to dedicated DSPs these days we’re focusing on the editing and compositing process, rendering to a low CPU overhead format (XDCAM EX). This specific test comes from Sony, and measures how long it takes to render a video.

Compute: Sony Vegas Pro 12 Video Render

Vegas is another OpenCL benchmark, and another benchmark NVIDIA brings up the rear with. Certainly the additional compute performance of the GTX 650 Ti Boost over the GTX 650 Ti is helping NVIDIA here, but it can’t make up for a gap of over 30 seconds.

Wrapping things up, our final compute benchmark is an in-house project developed by our very own Dr. Ian Cutress. SystemCompute is our first C++ AMP benchmark, utilizing Microsoft’s simple C++ extensions to allow the easy use of GPU computing in C++ programs. SystemCompute in turn is a collection of benchmarks for several different fundamental compute algorithms, as described in this previous article, with the final score represented in points. DirectCompute is the compute backend for C++ AMP on Windows, so this forms our other DirectCompute test.

Compute: SystemCompute v0.5.7.2 C++ AMP Benchmark

SystemCompute mixes things up a bit with its multiple sub-benchmarks, but it still doesn’t change the fact that Kepler and GTX 650 Ti Boost just don’t do that well in most compute scenarios. 68K points is enough to tie the 6870 of all things, itself not a particular good compute card. Otherwise the bar is set by AMD at over 100K points.

Civilization V Synthetics


View All Comments

  • Hrel - Tuesday, March 26, 2013 - link

    More realistically, price the GTX660 at MOST 180. I can find 7850's for 160, from XFX no less.

    Anandtech, please add an "edit" function to you comments. Also, I want an email when someone responds to me. Then to be able to click a link that takes me directly to that comment, instead of having to plow through 100's of comments.
  • CiccioB - Tuesday, March 26, 2013 - link

    nvidia prices its solutions at the price it think they are best. If GTX660 sells like cookies, why on earth should they lower the price? To have a red quarter like AMD?
    And possibly they have quite a few GK106 with just some shaders dead but the memory controller completely working. So those pieces would have to be sold at GTX650 Ti price. With this move they can sell them with a bit of premium price.
    Consider that for nvidia this new board costed zero, while AMD had to forge a new chip, which has a cost.
  • Hrel - Tuesday, March 26, 2013 - link

    It'd be nice to Just Cause 2 in your benchmarks. It has a built in benchmark and everything. Awesome game people will be playing for years, considering they added multi-player. I know you're still working on the benchmark suite, so this is a suggestion I'd really like to see. Reply
  • Hrel - Tuesday, March 26, 2013 - link

    nice to see*

    Holy Batman do you guys need to add an edit function to your comments.
  • aTonyAtlaw - Tuesday, March 26, 2013 - link

    I would posit that perhaps you need to proofread your comments more than Anandtech needs to provide an edit function. Reply
  • skiboysteve - Tuesday, March 26, 2013 - link

    its good to keep in mind that open air coolers can be very loud if you dont have a well ventilated case like me. I have a 6850 with an open air cooler and the thing is VERY loud because it gets so crazy hot inside my case. If I had a blower on it, it wouldn't be nearly as loud Reply
  • marc1000 - Tuesday, March 26, 2013 - link

    where is Starcraft II ? it's no longer part of the test suite? Reply
  • Ryan Smith - Tuesday, March 26, 2013 - link

    Yes, it was removed. It gets rather silly on high-end cards these days, which is what we base our benchmark selections on. Reply
  • Oxford Guy - Tuesday, March 26, 2013 - link

    How about Skyrim with the high resolution textures? I've heard that that requires 2 GB to run decently. That would be nice to see tested when the silly 1 GB card is released. Reply
  • warezme - Tuesday, March 26, 2013 - link

    I think it would be interesting to also post mobile GPU numbers along with these cards. In this field of models there is some relevance related to how the two types would perform in similar games as a comparison. Reply

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