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Thread: need low TDP CPU but no Atom!

  1. #1
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    need low TDP CPU but no Atom!

    Hi There,

    I am currently planning my first car pc.

    As power source i want to use a pico-type psu and I think that i will go with a mini itx board.

    I now searched for suitable CPUS but I didnt find any ones that are lower than 45W TDP. Compared to a D510 Atom which has 13W TDP this is very much!

    What are low TDP CPUs and how much heat can I save by underclocking the CPU?

  2. #2
    And then I was mod. Tidder's Avatar
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    Look into mobile processors. Lots of the Core 2 Duos are 25w TDP.
    Tidder

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  3. #3
    Admin. Linux loser.
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    Bugbyte's Avatar
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    If power is the consideration, take a look at the IGEP V2 from ISEE or the Beagleboard XM. It is a linux embedded device that is extremely low power.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
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  4. #4
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    thx for the advices!

    Acutually i want to run Win7 x64 and Centrafuse as frontend so a linux embedded System is out of discussion! The embedded Sys will also have even lesser guts than the Atom!

    25W TDP sounds interessting. Which socket do this core2duos use?

    I only know the socket P which is outdated and the socket 988 which is only used on mobile boards afaik.

  5. #5
    And then I was mod. Tidder's Avatar
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    There are lots of Socket P processors on newegg and as far as motherboards go, a quick search turned up this http://www.newegg.com/Product/Produc...82E16813153174

    I guess you are stuck with "outdated" socket P if you don't want to go atom and need a low power processor. Sounds like you need to do more research and see what's out there.
    Tidder

    Try RevFE
    The best resurrected frontend I've ever used, period.

  6. #6
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    Search for "Core 2 Duo Mobile" on newegg.com. The CPUs start at $215, not cheap.

    Somebody on another thread mentioned AMD Ontario and Zacate, forthcoming Q1 2011.

    Basically if money is no concern and you need it now, buy a C2D Mobile. If money is tight and need it now, Atom is hard to beat. If you can wait a few months then wait for the new AMD offerings. Those would be my choices in the low TDP CPUs.

  7. #7
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    AMD has Socket AM3 processors at 25 Watts TDP, 270u 2.0 GHz.,260u 1.8 GHz. and 250u 1.6 GHz. They also have a 20 Watt 160u 1.8 GHz. These are dual core, 2 MB L2 cache (250u is 1MB). Click on link http://www.amd.com/us/products/deskt...omparison.aspx for more specs.

    www.shopblt.com has the 270u listed at $91.16 USD, 260u $90.94,250u $78.76 and 150u at $48.76
    www.pcsuperstore.com also lists these processors

    A warning, no one keeps stock, BLT says it takes 15 days to order in, but my experience is 3 weeks to arrive and 1 more week to ship, and don't get it shipped USPS priority parcel, or it's 2-3 more weeks to arrive.

    You can get a Socket AM3 785GX-SP128M for $129 at
    http://www.mvixusa.com/shop/index.ph...roduct_id=1600
    Or a Socket AM3 890GX-USB3 for $199.00
    http://www.mvixusa.com/shop/index.ph...roduct_id=1613

    NVix is a US company, so you should be able to RMA the motherboard if it doesn't work or malfunctions under warranty. I haven't checked on other manufacturers of mini ITX AMD boards.

    Don't ask the quality of the J&W Minix motherboards, I have the 890GX-USB3,(nice board, VGA/DVI/HDMI, So-Dimm PC3-850/1066,comes with N WiFi and Bluetooth adapter, PCI-e, USB3 and SATA III) but waiting for my 270u CPU to arrive by snailmail.

    I've never underclocked a AMD CPU, but imagine it depends the same as overclocking, some from one batch might work OK, other's not. The 780GX-USB has the ability to Under/over clock CPU's, and if you upgrade to a newer board later on, you can always put in a 6 core and use it for a home entertainment unit.

  8. #8
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    ty, for the advcie! The Athlon II X2 270u looks very very promissing.
    Unfortunately it isnt aviable in germany yet but I have to wait about 6mounths till my car arrives anyways.

  9. #9
    Variable Bitrate Zogg's Avatar
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    Intel Celeron 430 and 440 are 35W cpu's available now. I've had one in my carputer in the past and it worked great. I'm running a 65W e5200 now just because I wanted to try watching TV (ATSC) and needed a bit more horsepower to decode HDTV, but the 430 worked so well that I have a home server based off one as well.
    Zotac N630I-D-E M/B w/ Nvidia 7100, E5300 cpu, Xenarc 700IDT, M2-ATX, XP, RR & DFX 5.1.

  10. #10
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    i run a celeron 430. its plenty fast enough, even though i get a lag after saying commands.... i think i have a software problem though. its a night and day difference over an atom setup though.

    edit- fixed my problem! debugging for rrvoice was set to OFF in the config program, but once i went into the rrvoice.ini file i noticed it was set to TRUE. i wrote in False and now everything is instant.

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