The Great Equalizer 3: How Fast is Your Smartphone/Tablet in PC GPU Termsby Anand Lal Shimpi on April 4, 2013 1:00 AM EST
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For the past several days I've been playing around with Futuremark's new 3DMark for Android, as well as Kishonti's GL and DXBenchmark 2.7. All of these tests are scheduled to be available on Android, iOS, Windows RT and Windows 8 - giving us the beginning of a very wonderful thing: a set of benchmarks that allow us to roughly compare mobile hardware across (virtually) all OSes. The computing world is headed for convergence in a major way, and with benchmarks like these we'll be able to better track everyone's progress as the high performance folks go low power, and the low power folks aim for higher performance.
The previous two articles I did on the topic were really focused on comparing smartphones to smartphones, and tablets to tablets. What we've been lacking however has been perspective. On the CPU side we've known how fast Atom was for quite a while. Back in 2008 I concluded that a 1.6GHz single core Atom processor delivered performance similar to that of a 1.2GHz Pentium M, or a mainstream Centrino notebook from 2003. Higher clock speeds and a second core would likely push that performance forward by another year or two at most. Given that most of the ARM based CPU competitors tend to be a bit slower than Atom, you could estimate that any of the current crop of smartphones delivers CPU performance somewhere in the range of a notebook from 2003 - 2005. Not bad. But what about graphics performance?
To find out, I went through my parts closet in search of GPUs from a similar time period. I needed hardware that supported PCIe (to make testbed construction easier), and I needed GPUs that supported DirectX 9, which had me starting at 2004. I don't always keep everything I've ever tested, but I try to keep parts of potential value to future comparisons. Rest assured that back in 2004 - 2007, I didn't think I'd be using these GPUs to put smartphone performance in perspective.
Here's what I dug up:
|The Lineup (Configurations as Tested)|
|Release Year||Pixel Shaders||Vertex Shaders||Core Clock||Memory Data Rate||Memory Bus Width||Memory Size|
|NVIDIA GeForce 8500 GT||2007||16 (unified)||520MHz (1040MHz shader clock)||1.4GHz||128-bit||256MB DDR3|
|NVIDIA GeForce 7900 GTX||2006||24||8||650MHz||1.6GHz||256-bit||512MB DDR3|
|NVIDIA GeForce 7900 GS||2006||20||7||480MHz||1.4GHz||256-bit||256MB DDR3|
|NVIDIA GeForce 7800 GT||2005||20||7||400MHz||1GHz||256-bit||256MB DDR3|
|NVIDIA GeForce 6600||2004||8||3||300MHz||500MHz||128-bit||256MB DDR|
I wanted to toss in a GeForce 6600 GT, given just how awesome that card was back in 2004, but alas I had cleared out my old stock of PCIe 6600 GTs long ago. I had an AGP 6600 GT but that would ruin my ability to keep CPU performance in-line with Surface Pro, so I had to resort to a vanilla GeForce 6600. Both core clock and memory bandwidth suffered as a result, with the latter being cut in half from using slower DDR. The core clock on the base 6600 was only 300MHz compared to 500MHz for the GT. What does make the vanilla GeForce 6600 very interesting however is that it delivered similar performance to a very famous card: the Radeon 9700 Pro (chip codename: R300). The Radeon 9700 Pro also had 8 pixel pipes, but 4 vertex shader units, and ran at 325MHz. The 9700 Pro did have substantially higher memory bandwidth, but given the bandwidth-limited target market of our only cross-platform benchmarks we won't always see tons of memory bandwidth put to good use here.
The 7800 GT and 7900 GS/GTX were included to showcase the impacts of scaling up compute units and memory bandwidth, as the architectures aren't fundamentally all that different from the GeForce 6600 - they're just bigger and better. The 7800 GT in particular was exciting as it delivered performance competitive with the previous generation GeForce 6800 Ultra, but at a more attractive price point. Given that the 6800 Ultra was cream of the crop in 2004, the performance of the competitive 7800 GT will be important to look at.
Finally we have a mainstream part from NVIDIA's G8x family: the GeForce 8500 GT. Prior to G80 and its derivatives, NVIDIA used dedicated pixel and vertex shader hardware - similar to what it does today with its ultra mobile GPUs (Tegra 2 - 4). Starting with G80 (and eventually trickling down to G86, the basis of the 8500 GT), NVIDIA embraced a unified shader architecture with a single set of execution resources that could be used to run pixel or vertex shader programs. NVIDIA will make a similar transition in its Tegra lineup with Logan in 2014. The 8500 GT won't outperform the 7900 GTX in most gaming workloads, but it does give us a look at how NVIDIA's unified architecture deals with our two cross-platform benchmarks. Remember that both 3DMark and GL/DXBenchmark 2.7 were designed (mostly) to run on modern hardware. Although hardly modern, the 8500 GT does look a lot more like today's architectures than the G70 based cards.
You'll notice a distinct lack of ATI video cards here - that's not from a lack of trying. I dusted off an old X800 GT and an X1650 Pro, neither of which would complete the first graphics test in 3DMark or DXBenchmark's T-Rex HD test. Drivers seem to be at fault here. ATI dropped support for DX9-only GPUs long ago, the latest Catalyst available for these cards (10.2) was put out well before either benchmark was conceived. Unfortunately I don't have any AMD based ultraportables, but I did grab the old Brazos E-350. As a reminder, the E-350 was a 40nm APU that used two Bobcat cores and featured 80 GPU cores (Radeon HD 6310). While we won't see the E-350 in a tablet, a faster member of its lineage will find its way into tablets beginning this year.
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marc1000 - Saturday, April 6, 2013 - linkAnand, it seems you are talking about Sony (I doubt it is MS). And unfortunately I am one of the orphaned users of the ill fated Xperia Play. They had a HUGE trump card with that phone, but killed it deliberately to clear the path to PS Vita. So I have to say that I doubt they will ever release games for any tablet, instead they will keep pushing PS3/4 + Vita combo.
Krysto - Thursday, April 4, 2013 - linkWhere's the proof that E-350's CPU is faster than Cortex A15? Or did I miss it?
milli - Thursday, April 4, 2013 - linkYou need to compare the physics score between the E-350 and Nexus 10. It shows that the Bobcat core has a higher IPC compared to the A15.
scaramoosh - Thursday, April 4, 2013 - linkcompared to 8 year old desktop gpus....
compare them to a 7990
tipoo - Thursday, April 4, 2013 - linkThe graphs on the chart would have to be smaller than the width of a pixel :P
it's still impressive that single digit watt system on chips are getting up around 7 year old GPU performance though, the Geforce 7800 is close to what the 360 has. From everything I've been hearing SGXs Rogue/600 series will be a huge boost, bigger than just adding MP cores.
B3an - Thursday, April 4, 2013 - linkYeah Anand, put a Nividia Titan or 7990 in there just for the lolz. Have it on the last page or something, it would just be interesting and amusing.
fabarati - Thursday, April 4, 2013 - linkA good thing to remember is that despite the 8500 GT scoring better, the 7900 GTX (and gs and 7800 gt) was much faster in actual games.
tipoo - Thursday, April 4, 2013 - linkYeah, the 8500 is only faster when it's a complete vertex or pixel shading situation due to its unified shaders, in most games with mixed requirements the 7900 would still beat it with its fixed shaders.
Flunk - Thursday, April 4, 2013 - linkBecause modern games are more shader heavy this would no longer be the case. A 8500 GT beats a 7900 GTX hands down for modern game performance. However, both are still pretty bad. A higher end card like a 8800 GT is still usable in a lot of games where the 7 series is totally unusable.
Friendly0Fire - Thursday, April 4, 2013 - linkDo mobile games use a lot of shaders though? What I've seen looks a lot closer to early DX9 era pipelines than the shader-heavy setups console/PC games have been moving towards.