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Bencmark Results: Synthetics

AVADirect's W860CU: Mobility Radeon HD 5870 Vs. GeForce GTX 285M
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We wouldn’t expect to see any noticeable difference in CPU or memory performance between two systems that differ only in graphics, yet enthusiasts looking to break away from the desk will be interested to see how much performance must be sacrificed.

Synthetic benchmarks represent the “worst case” for the mobile CPU, since these benchmarks are multi-threaded and optimized for Intel’s quad-core devices. That’s because Intel Turbo Boost doesn’t work as aggressively when all four cores are occupied and the mobile processors have a lower standard frequency. As stated on the previous page, more optimistic turbo multipliers for the mobile processors allow them to frequency-match the desktop part whenever fewer processing threads are in use.

A 35% lower clock speed gives way to a performance loss of around 40% for the mobile CPU in this fully threaded benchmark. Our real-world benchmarks have shown that many applications are poorly threaded, though the industry is advancing.

The desktop platform also has a triple-channel memory controller, yet once again we remind readers that our real-world benchmarks have not previously shown a significant benefit in applications.

PCMark results are influenced by the fact that AVADirect uses high-performance solid-state disks. Our current application benchmark set has not shown more than the slightest preference for the lower seek times that these devices provide, but in the real-world, booting Windows and loading the levels in your favorite games will happen faster.

3DMark shows some inconsistency, though a look at its GPU results (not shown) confirm that a desktop Radeon HD 5850 is twice as powerful as a Mobility Radeon HD 5870.

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  • 2 Hide
    ksampanna , 15 May 2010 17:13
    I must say I was under the impression that mobility graphic cards are similarly specced versions of their desktop counterparts & perform the same. Thanks to AVADirect & Toms for making me aware of my ignorance.
  • 0 Hide
    tranzz , 15 May 2010 23:09
    Dirt 2 the full game has the benchmark feature at the bottom of the graphics options. You say it dosn't but I have double checked. Only diff is I run under XP.
  • 1 Hide
    Silmarunya , 15 May 2010 23:54
    ksampannaI must say I was under the impression that mobility graphic cards are similarly specced versions of their desktop counterparts & perform the same. Thanks to AVADirect & Toms for making me aware of my ignorance.


    Simple logic was enough to figure out it isn't the case. A Radeon 5870 is 11 inches long, way larger than you can fit in a laptop. It generates significantly more heat than a laptop can possibly dissipate. And the big one: a laptop has to be able to run on a battery at least for a while. It can't power a desktop graphics card for any length of time...
  • 0 Hide
    eriko , 20 May 2010 08:47
    I'd love to see the industry forced not to be able to name COMPLETELY DIFFERENT HARDWARE - ie.e graphic cards for laptops and desktops, via the same name.

    'tis common sense.
  • 0 Hide
    Anonymous , 20 May 2010 22:26
    why? It's built on the same architecture. Thought it would be pretty obvious it's going to be a mild alternative considering the space it has to fit in. Portable gaming should be left to ignorant people anyway. Buy a DS
  • 0 Hide
    Anonymous , 30 May 2010 01:52
    I didn't see a mention of the max resolution of the two cards, the 5870 is the only of the two cards that can drive a 30" screen at 2560x1600 which is why i'm considering an upgrade.
  • 0 Hide
    Anonymous , 30 May 2010 01:53
    I didn't see a mention of the max resolution of the two cards, the 5870 is the only of the two cards that can drive a 30" screen at 2560x1600 which is why i'm considering an upgrade.