so... 550mhz?

Discussion in 'Android Hacks and Help' started by Sam, Oct 25, 2009.

  1. eetu

    eetu New Member

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    Snapdragons, the OMAP on the Droid, and the Samsung on the iPhone are all System On a Chips. Each one has a graphics processor and a main processor.

    No one knows the exact spec of the iPhone graphics processor but all signs point to the same PowerVR in the Droid, but possibly faster.

    All three processors in each SOC are all Cortex A8 based, so their Mhz should be comparable (Snapdragon possibly being the fastest, then the OMAP and Samsung somewhat tied).

    This means that the Snapdragon SOCs are probably the fastest overall in terms of system performance and graphics performance. Then the Samsung, then the Droid's TI OMAPs.
     
  2. rushmore

    rushmore Member

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    Snap uses a weaker DSP and GPU but makes up using more clock cycles. The problem is Snap eats more battery than the 3430 to get the same amount of work done.

    Most snaps are expected to be clocked at a 750mhz cap due to battery and heat concerns. Still using 65nm fabrication process so battery bleed and heat are an issue
    and reason for 750mhz cap. Some may go higher, but 850mhz is the expected threshold for official roms.

    Also have to watch out because Snap has even weaker integrated DSP and GPU functions built in. Some device makers will not even bother with discrete DSP or GPUs since cheaper for them!

    Still, as usual, fanboys with those weaker chipset devices will swear their device is best ;)
     
  3. Dave12308

    Dave12308 Silver Member

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    I'm not sure how that would make it superior to the iPhone? The iPhone 3GS has a PowerVR SGX 535 GPU, which is more powerful than the 530 in the Droid.
     
  4. New2u

    New2u Super Moderator

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    Because the droid isn't SoC. From everything that's been said, it has it's CPU and GPU separate. So if someone has anything that shows otherwise please send a link.

     
    #16 New2u, Nov 16, 2009
    Last edited: Nov 16, 2009
  5. New2u

    New2u Super Moderator

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    Everything i've seen on the documents state the droid is NOT a SoC. It has a CPU and a separate GPU.

    "But the main processor is also accompanied by a separate on-board graphics chip"
     
  6. Randomocity

    Randomocity Member

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    To clarify, the droid is NOT a SoC. If you've looked through the teardowns, the CPU and GPU are two completely separate chips, on two different areas of the board. The iphone 3GS uses a very similar architecture, so the droid for all intents and purposes should perform the same as the iphone if not better. Both run the cortex a8. The snapdragon may be 1Ghz, but chances are that'll probably get underclocked, and remember people, clock speed isnt everything.
     
  7. New2u

    New2u Super Moderator

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    Though the Iphone is a SoC.
     
  8. DaHarder

    DaHarder Member

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    Overclocking is tempting, but not at the sacrifice of the DROID's surprisingly good battery autonomy.


    Happy DROIDing​
     
  9. rushmore

    rushmore Member

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    In theory, yes, but the problems is Android apps and its SDK are higher level due to the need for apps to be compatible with many chipsets. iPhone on the other hand has a more robust SDK with more API access since they only have to design for a few chipsets. The result is lower level code options for iPhone's OS and more efficient and more powerful apps by third parties.
     
  10. limaxray

    limaxray New Member

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    I think there is a bit of misunderstanding - the OMAP3430 in the Droid is a SoC that contains not just the CPU and GPU, but also a DSP and an image processor. Looking at the break down pics, there is no separate GPU.

    Also, part of the reason for under clocking is not just to save battery life, but also to extend the life of the processor. TI gives different MTBF ratings for the OMAP depending on the clock speed. So while it *can* do 600 MHz, it does significantly shorten the life of the chip. The OMAP36xx chips are built using a 45nm process and can do up to 1 GHz. The multicore OMAP4s can do over 1 GHz.

    I think the Snapdragon will always be slightly behind in terms of performance - they are just releasing chips now that exceed the performance of the 2 year old OMAP3. The real advantage of these chips however is that they include the cellular modem and GPS onto a single package. This means devices using them can be made much smaller for comparable performance.
     
  11. hazydave

    hazydave Member

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    The DROID is using the Texas Instruments OMAP 3430 processor. This is very much a System-on-a-Chip design, including the ARM Cortex A8 CPU, the POWERVR SGX GPU, TI's IVA-2+ media processor (accelerates video encoding/decoding), and an image processor (primarily for camera input). The media processor and much of the other bits are enhanced versions of the modules in TI's DaVinci processor line, which have been in many if not most of the high-end PMPs lately (Archos, Cowon, etc)... at least before the nVidia Tegra came out.

    It also includes nearly all the I/O needed in the system, aside from the radio/baseband processors themselves. See info here:

    OMAP™ 3 Processors - OMAP3430

    The iPhone 3GS is believed to use a version of the Samsung S5PC100 processor. Apple and Samsung have been mum about the iPhone specifics, but the S5PC100 is documented (see link). This has similar units for video, 3D, and image processing, as you might expect.

    http://www.samsung.com/global/busin...wnloads/systemlsi/s5pc100_brochure_200902.pdf

    Only recent smart phones have this level of processor... the DROID, the iPhone 3GS, the Palm Pre (also uses the TI3430), maybe a few others. Older smart phones are more likely to use an ARM-11 or Marvell (formerly Intel, formerly formerly DEC) XScale (nee StrongARM) applications processor. The Cortex offers a much improved floating point unit, the NEON SIMD instruction set (like SSE on the x86), and 2-issue superscalar operation, versus single issue on the ARM-11 (both in-order).
     
  12. New2u

    New2u Super Moderator

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    I think the main confusion really comes from the amount of articles that more or less state one thing or another. Here are a few examples of what i mean.

    All taken from separate websites.
     
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