AMD’s Brazos vs. Atom Thermals, Revisited

Last week, we met with AMD at their CES location to see some of their upcoming systems and laptops. While they’ve also recently released several new desktop GPUs, there wasn’t anything new to discuss in that area. The same applies to their desktop CPUs—we’re all waiting to see Llano and Bulldozer. So the focus at CES was understandably on Brazos, aka the “first APU” Vision C- and E-series processors.

We’ve been critical of some of the staged platform comparisons we’ve seen in the past—as Anand put it, the onus is on AMD in this case to provide a truly representative comparison between their new product and Intel’s competing offerings. After the demonstration of their Brazos netbooks on Thursday, AMD called us back and said they wanted to let us rerun the tests to make sure we accurately represented the two platforms. See, there was a slight snafu in the initial thermal imaging comparison. Specifically, AMD thought they put out a netbook with a C-50, but the test system was actually a C-30. So, we returned….

The reason for the mix-up was simple: they had both a C-30 and C-50 system from the same OEM, and they’re basically identical (one was dark blue and the other was light blue). Given that the two C-series parts are both 9W TDP, we didn’t expect much to change, and the new testing confirmed this. We did get some better images of both the top and bottom of the three test netbooks—Atom N550 vs. C-30 and C-50. Unfortunately, stupidity on my part resulted in the loss of said images (it’s a long story…), so all we have are the thermal shots from the keyboard area and screenshots showing CPU utilization during playback along with screen captures taken with FRAPS.

The above gallery shows essentially the same thing as our initial testing: Brazos using its GPU uses less power and runs cooler than Atom N550 doing the decoding in software. The difference between the C-30 and C-50 is pretty much non-existent, as expected. The testing environment was not conducive to doing any form of noise comparison, so while the N550 setup was clearly warmer we couldn’t say if it was quieter or not. Battery life is looking to roughly equal Atom, so that’s good to see. Now we’re waiting for final hardware to see if we can shed any more light on the situation, as well as running our full suite of tests.

We also took the opportunity to capture a video showing the 1080p playback comparison, as that’s part of the story. The video in question is Big Buck Bunny, an open movie demo created as part of the Peach movie project. (You can read more about it on their site, though it’s old enough now that if you haven’t heard of it already there’s not much to add. Suffice it to say, the lack of any licensing issues meant BBB was all over the CES floor, and I’m tired of the short now!) This particular version is a stereoscopic rendering, so instead of the normal 24FPS the frame rate is 48FPS according to FRAPS.

I believe during playback Arcsoft TotalMedia Theater 5 is skipping half the frames, as none of the netbooks come equipped with a 3D 120Hz panel. Does that actually matter? Not that we could tell—now that we’re home from CES, I ran the regular 24FPS version of Big Buck Bunny on a different dual-core N550 netbook, and frame rates still frequently dropped into the teens. Actually, it was worse than the netbook at AMD’s demonstration, but that’s probably more to do with lack of optimizations and some bloatware that came preinstalled; but I digress….

You can see during playback that the Atom N550 periodically stutters and drops below 48FPS—and more importantly, it’s far below 24FPS as well at times. In comparison, both the Vision C-30 and C-50 Brazos/Ontario chips manage a consistent 48FPS. The C-30 does flicker between 47 and 48FPS, but again, that may simply be an artifact of using a stereoscopic 3D video on a non-3D panel. Temperatures are in line with what we reported in our earlier coverage, and the two AMD netbooks are virtually identical. CPU utilization on the dual-core C-50 is lower by about half, as expected.

Once More, With Feeling

This is essentially the killer app of Brazos compared to Atom, and it’s important to keep things in perspective. These chips have a much better IGP than Atom, but at least on the nettop side of things the faster AMD E-350 isn’t miles ahead of Atom D510 in the CPU department. When we drop clock speeds down to 1.0GHz (dual-core C-50) from 1.6GHz (E-350) and compare that to the Atom N550 (1.5GHz)… well, 62.5% of the performance of E-350 compared to 90.4% of the performance of D510 means that in some tests the N550 will probably beat the C-50 for raw CPU potential. Yeah, that’s a concern for me. The GPU is the real difference, so naturally a video decoding test is the best-case scenario. I suspect C-50 will be underpowered for most 3D games, even if the DX11 GPU inside Brazos is fast enough—it will just be the AMD equivalent of Atom + NVIDIA ION, only without as many discrete chips.

We also have to consider performance of the next tier of CPUs and IGPs. Atom is the lowest of the low hanging fruit; we have much faster chips and IGPs from both AMD and Intel, and we don’t need to move up to current generation parts like 2nd Gen Core processors. Even the old Core 2 Duo CULV chips are a darn sight faster than Atom (2x-3x faster), and bad as GMA 4500MHD is, it could do an okay job at H.264 offload. It appears that the E-350 will end up delivering performance roughly equal to the old CULV chips (probably a bit slower, to be honest). That means it will also be around the same level as the Athlon II Neo K325, only with a better IGP and apparently improved power characteristics.

The biggest point in favor of Brazos isn't performance, though. It's going to be cost. If AMD can get partners to put out $400 netbooks (hopefully without Win7 Starter and with more than 1GB RAM), that will hopefully put the nail in the current iteration of Atom. We've seen the Brazos chips, and they're extremely small—smaller even than Atom—so pricing should be very compelling. AMD also doesn't appear concerned about protecting their more expensive mobile offerings (mostly because there aren't many), so they don't have to castrate Brazos in the same way Atom has been stagnant since the first N270 rolled out. Well equipped Brazos netbooks (and nettops) in the $500 range should also be a more elegant choice than Atom + ION/NG-ION, so again AMD looks set to win several matchups.

We’re working to get Brazos hardware in for testing as soon as possible, but it looks like the biggest beneficiaries will be users that want good H.264 decoding in a 10.1” form factor, or an alternative to ION. If you’re looking for the ultimate HTPC chip, we’ll have to investigate that area in further detail, as bitstreaming support and other features are still a question mark. Right now, Brazos is shaping up to be what we all wanted from Atom last year; whether that will be enough in 2011 remains to be seen.

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  • nitrousoxide - Monday, January 17, 2011 - link

    Tablet is just an alternative, not replacement for netbooks. If you like a tablet, grab one for sure; but that's not the case for most people. And please note that tablet is just at its very beginning.
  • silverblue - Monday, January 17, 2011 - link

    Regardless of what the machine has in it, what truly matters is what it can do for the consumer. So, as long as manufacturers put down what it can do, such as "9 hour battery life (typical)" or "watch movies in full HD" or suchlike on the packaging, that'll do just nicely. If someone sees an AMD logo at the same time, it can only be a good thing.

    Laptop manufacturers should flock readily to Brazos due to the cheaper platform cost so it shouldn't be too hard to sell plenty of netbooks.
  • Byte - Monday, January 17, 2011 - link

    I had some high hopes for AMD getting back in the game somehow. God knows I loved them in the XP days. After the P!!! 800MHz, it was Athlons for a couple of years until wolfdales.

    Bulldozer has been hyped for so long, i was hopping for something really interesting like reverse hyperthreading, but instead we get a hardperthreading.

    And then there was Fusion. Pretty much everyone was waiting for that. CPU and GPU in one chip! How do you do that!?!?! They took so long Sandy Bridge came rolling by so casually, no one even noticed.

    And AMD laptops, oh my how they are just so behind. Performance somehow feels terrible even comparing to a Core 1 Duo vs Turion X2, and its just hot and sucks battery.

    I've been telling everyone to hold off on their netbook purchases as AMDs got something twice as fast coming out, but at 1GHz, it will be twice as fast, only folded in half! UGhhhhh!
  • Lolimaster - Monday, January 17, 2011 - link

    That's the low end of Brazos(Ontario), Zacare runs at 1.6Ghz. Is the only netbook chip now and it delivers, no more sub-par performance (Atom).

    If this Fusion chip brings this performance prepare for the mainstream one, Llano.
  • ninjaquick - Tuesday, January 18, 2011 - link

    llano is just a slightly modified re-badged K10. Trinity is Bulldozer which is a completely new and unique design. Basically:

    Bobcat - Atom
    Llano - CULV (Conroe)
    Bulldozer - Core i5-i7 (Nehalem)
  • silverblue - Wednesday, January 19, 2011 - link

    Llano sounds good, however I expect it'll run into bandwidth issues when you jack the settings up too highly. As a result, I'm looking forward to how overclocking benefits such systems.
  • silverblue - Monday, January 17, 2011 - link

    A Turion X2 was merely a mobile Athlon 64 X2, so not exactly difficult for a dual-core Core CPU to win a battle there. However, Bobcat performs close to a similarly clocked Turion X2 with a fraction of the power and heat.
  • mschira - Monday, January 17, 2011 - link

    Engadget has a review on an HP 11" notebook with Fusion.

    They had it for a week and seemed to kinda liked it, performance, battery life and price seem nicely balanced.

    Now what would be really great if one could overclock the 1.6Ghz APU a bit when plugged in.
    That would be really great...
  • ninjaquick - Tuesday, January 18, 2011 - link

    Cuz the Atom is so fast...
  • digitalzombie - Wednesday, January 19, 2011 - link

    I read a few pages of comments and there were so many flames for bias.

    I think Anandtech is the only site I know of that actually does fair reviews. I think the article is fine. Was totally hoping that AMD's APU was going to revolutionize the netbook market but sadly it's not going to be this first gen iteration, stupid Atom setting the bar so low. Well, I still kinda hope I can still watch movie on my laptop without burning my stomach on AMD's new APU. Can you guys have a test like that? Where you lay on a bed and have the laptop on your stomach while watching a movie? >,<

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