Power Consumption and Final Words

At 2.0GHz, Yonah is basically equal to, if not slightly slower than an Athlon 64 X2 running at the same clock speed in virtually all of the tests we ran. The important distinction here is that Intel is able to achieve that level of performance, without an on-die memory controller. But there is also one more thing to note, Yonah can offer that level of performance with significantly lower power consumption:

Total System Power Consumption - Idle

Total System Power Consumption - Load

While the Yonah and Athlon 64 X2 systems consumed relatively similar power at idle, Yonah hardly eats up any more power under full load. In fact, a 2.0GHz Yonah under 100% load consumes less power than an Athlon 64 X2 3800+ at idle. Obviously Intel has the advantage of being on a much lower power 65nm process, but it won't be until the second half of next year before we see any Athlon 64 X2s at 65nm, so it is an advantage that Intel will have for quite some time.

Although we didn't consider it as such here today , Yonah will be quite impressive on notebooks. The thought of having such a cool running dual core processor in a notebook is honestly amazing, and the performance difference (especially for multitaskers) over what we have today will be significant. The other thing to keep in mind is that when you go from a single core to a dual core Pentium M notebook, you won't be giving up anything at all. On the desktop side, you normally give up clock speed for dual core support, but Yonah will be running at very similar frequencies to what Dothan is running at today. In other words, you won't be giving up single threaded performance in favor of multi-threaded performance - you'll get the whole package.

As a desktop contender, Yonah is a bit of a mixed bag. While its performance in content creation applications has definitely improved over the single core Dothan, it still falls behind the Athlon 64 X2 in a handful of areas. Intel still needs to improve their video encoding and gaming performance, but it looks like we may have to wait for Conroe and Merom for that.

Multitasking Performance
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  • edwardhchan - Wednesday, November 30, 2005 - link

    For those who care, this is probably the chip that will make it into the Macs next year. Drooling over a new powerbook that dualboots.... Reply
  • bldckstark - Wednesday, November 30, 2005 - link

    I suppose you will be drowning yourself when you start dreaming of a triple boot with the GoogleOS? On Cell processors? With SkyFi wireless bouncing signals off of the moon (system outage during new moon transition)?
    Dreams of vaporware let you down more often than a topless dancer when you run out of ones.
    I do however often dream about my robotically driven car so that I may play PC games from the back seat on my 60" OLED TV during the drive to work. Imagine internet access on the road then. All the mobile PRON. Gives a new meaning to the word carjack doesn't it?
    Reply
  • dougSF30 - Wednesday, November 30, 2005 - link

    and on the next generation process.

    So really, one could say it this way:

    AMD's IMC allows their 90nm DC part with 1/2 to 1/4 the L2 cache to perform better than Intel's new 65nm part running at the same clock speed.
    Reply
  • fitten - Thursday, December 01, 2005 - link

    Only fanbois would say that (or folks who just don't know about computer architectures).

    a) The AMD Athlon64 has a faster FPU than the Yonah. Benchmarks doing heavy FPU will do better aon the Athlon64.
    2) The Athlon64 has more memory bandwidth available to it than the Yonah. While chipsets for Yonah are dual channel, the chip itself still seems to be single channel (like it's predecessors - for power reasons). This configuration does give better performance than all single channel but it isn't as good as all dual channel.
    D) Despite these two disadvantages (there are a few others), Yonah still manages to stay close to the Athlon64 parts on average. Some benchmarks it's actually a little faster and some it's a fair bit slower.

    One of the best unsung things about the Athlon64 X2s is that a single core Athlon64 only benefits marginally in real benchmarks with dual channel memory compared to single channel memory (ignore synthetic benchmarks). The best I've seen is 20% faster but it is typically on the order of 7% faster. This means that adding a second core, which can double the bandwidth requirements to main memory in really bad situations, can be almost completely satisfied by dual channel. Using the best cases above, the benchmark would need 1.20x the bandwidth of single channel, so this same with a dual core would need 2.4x single channel bandwidth. That's only lacking by 20%.

    Compare this to the Pentium4 which gets very large speedups (60% or more sometimes) from dual channel over single channel. Two of those cores doing that would need 3.2x single channel, but dual channel only gives 2.0x meaning that the Pentium4 dual core may have a deficit of 60% of the bandwidth needed to run both cores full-tilt.
    Reply
  • Leper Messiah - Thursday, December 01, 2005 - link

    But what does the above have to do with Yonah's performance. Architecturally, Yonah is far closer to K8 than to netburst. It should have more than enough bandwidth provided with the "667" FSB, esp. if its dual channel. Reply
  • Anemone - Wednesday, November 30, 2005 - link

    I'd agree, the basic core of the A64 chip is quite superior to the P-M, meaning when you take out the cache factor (remember that also applies to programs whose requirements exceed the 2M cache as well so think ahead on that).

    And yes someone mentioned power requirements going up for Merom - which might require a moderating of clockspeeds to keep it in check in the mobile arena.

    Basically for AMD and Nvidia a big opportunity exists here to deliver (and deliver soon) the M2 and take advantage of a very good, but not superb chip from Intel. It remains to be seen if that can be done.

    Yonah is good, and would have been great if it had delivered when originally promised (Aug 05, from very early roadmaps), however it is not stellar. But as an overall mobile platform is is the current best. Kudos Intel.
    Reply
  • dougSF30 - Wednesday, November 30, 2005 - link

    And as far as power goes, Intel admitted that 64-bit would've pushed the power way up on Yonah, so you need to consider that when looking at Yonah TDP vs. X2 TDP. Reply
  • Amagus - Wednesday, November 30, 2005 - link


    I'm assuming the load tests were for both cores being fully stressed. What I would have like to have seen were power numbers on a similarly configured Dothan desktop. That would give us a better idea of how expensive that 2nd core is and how good Intel's 65nm process is.

    -Amagus
    Reply
  • phaxmohdem - Wednesday, November 30, 2005 - link

    Well, I'm fairly impressed with this chip personally. It's definately not the "spooge your pants" object of Techno-Lust many of us were hoping for, but as a man truely impressed with the performance of his Banias Pentium M 1.6GHZ CPU, I can only imagine how awesome that 2.0 Dually would be in a laptop.

    If Conroe can pull off slightly better performance per clock + higher clock speeds + add an integrated Mem/PCIe controller.... We might see some good shiznat in the year to come.
    Reply
  • NullSubroutine - Wednesday, November 30, 2005 - link

    Intel at least has something to offer if you want a decent notebook. I think it all comes down to cost. It probably wont be as equally fast as an AMD dual core Turion, but if it costs alot more, the whole "less power" really doesnt sell me on the extra money I would have to spend for the entire Intel setup.

    The product is a decent product, it doesnt blow you away, but it is something that you can get in a new system and not be disappointed (unless you encode/decode). I personally plan to buy a dual core laptop sometime at the end of spring, if the price is right, then it might be what I am getting (unless they produce that Monroe by then).
    Reply

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