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Thread: If my PSU is too small, what happens?

  1. #11
    FLAC WuNgUn's Avatar
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    Quote Originally Posted by ShawJohn View Post
    desktop dual core processing power is just not needed in a car...
    I wouldn't go so far as to say that exactly! I just found an AMD 64+ 2.2Ghz X2 CPU that I'll be using to replace my single core 2Ghz...(OPUS 320 power)

    I'm running 2 Xonar sound cards, thru AudioMulch, with active crossover (+ delay + EQ) outputed thru 11 channels and sampling at 24-bit and 96 to 192Khz, depending on whether it's just lossless CD audio, SACD or DVD-A...
    I can SQUEAK by at 96Khz, but 192Khz needs all the CPU I can give it...

    Also, I've gone thru two M4 PSU's (and a M2) and they just weren't up to the challege I guess...or they were just garbage.

  2. #12
    FLAC Dougw133's Avatar
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    Quote Originally Posted by Bugbyte View Post
    If it is running but the PSU is 'undersized,' it could shorten the life of the PSU. It all depends on exactly how you are overdrawing the supply. You may be using more power on one rail than the PSU is rated for even though the total wattage of the setup is below the max output of the PSU. Have you used one of the power calculators to figure the draw?

    In the short run, I'd at least take the screen off of the PSU and connect it to the car itself.
    I understand a "Desktop" dual core may be over kill but I had it laying around. I don't see how this is so bad. If I was utilizing 75% of the load all the time then I would see where we could have a problem.

    I already took as much off the PSU's shoulders as I could in the meantime until MP3car.com takes my bum M4 back. So the screen is off. It's pretty lines but it's off the PSU.

    When I usded a power calculator the recommendation with the scenario operating the PSU under 50% was 193W PSU. So I am under powered at peak. I guess I am just used to something either working, or not. Thanks...

  3. #13
    Variable Bitrate dMand's Avatar
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    shawnjohn, there's nothing wrong with a desktop cpu in a car. Besides those low voltage cpus that you think are effecient were used in a desktop environment once apon a time. Furthermore, what you use might not be suitable for doug's requirements, and vise versa.
    A dual core processor pulls what it needs, and doesn't draw it's maximum rated power all of the time. So it's great to have the extra power available when called upon. In the end, doug doesn't have to be concerned about needing a cpu upgrade any time soon, it was parts simply laying around. Just like my dual core setup.

  4. #14
    FLAC Dougw133's Avatar
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    Quote Originally Posted by dMand View Post
    shawnjohn, there's nothing wrong with a desktop cpu in a car. Besides those low voltage cpus that you think are effecient were used in a desktop environment once apon a time. Furthermore, what you use might not be suitable for doug's requirements, and vise versa.
    A dual core processor pulls what it needs, and doesn't draw it's maximum rated power all of the time. So it's great to have the extra power available when called upon. In the end, doug doesn't have to be concerned about needing a cpu upgrade any time soon, it was parts simply laying around. Just like my dual core setup.
    Thats my thoughts exactly. The most that CPU ever got to was 8%. I bought my C7 Jetway board 1 year ago when everyone here said 2.0GHZ was overkill for a Carputer. I found after 6 months it was under powered and not to my taste. It will onyl be a matter of time before everyone on here is buying boards with integrated dual cores and such. Thanks for the opinion though, it's something to consider.

  5. #15
    Variable Bitrate dMand's Avatar
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    Thumbs up

    Quote Originally Posted by Dougw133 View Post
    Thats my thoughts exactly. The most that CPU ever got to was 8%. I bought my C7 Jetway board 1 year ago when everyone here said 2.0GHZ was overkill for a Carputer. I found after 6 months it was under powered and not to my taste. It will onyl be a matter of time before everyone on here is buying boards with integrated dual cores and such. Thanks for the opinion though, it's something to consider.
    I just got through looking at Jetway jnc62k. It's an awesome mini-ITX board board, capable of quad core computing. You've got a great foundation for that processor.

  6. #16
    FLAC Dougw133's Avatar
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    Quote Originally Posted by dMand View Post
    I just got through looking at Jetway jnc62k. It's an awesome mini-ITX board board, capable of quad core computing. You've got a great foundation for that processor.
    The MB is great! I love it. My biggest plus was getting an Nvidia chipset and graphics. That alone probably improved my performance 500%. I would recommend it.

  7. #17
    FLAC WuNgUn's Avatar
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    I had terrible luck with the nForce2 chipset on my last carputer mainboard, from a performance perspective...
    And come to think of it, about the same with my last desktop PC that also had a nForce chipset. They are junk...
    ATI and Intel chipset, FTMFW!!!

  8. #18
    Variable Bitrate Ramanator's Avatar
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    WuNgUn, What makes the nForce chipset junk in the car environment?
    If you cant DODGE em, RAM em.

  9. #19
    FLAC WuNgUn's Avatar
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    Quote Originally Posted by Ramanator View Post
    WuNgUn, What makes the nForce chipset junk in the car environment?
    I'm going strictly by my experiences as it pertains to audio signal processing, i.e. AudioMulch...
    With my NF7-S board (which is considered a great socket A board), I was limited to how much VST plugins and at what sampling rate I was able to process my audio. Even with rather low CPU utilization (under 40%), I would get drop-outs, tempo shifts, static on the output stage...I was forced to lower my sampling rate.
    On my new board (socket 939), with an equivilent CPU, but with the ATI chipset, I'm able to sample higher and utilize more and more sophisticated VST's, while maintaining a higher or equal CPU load, and play the audio smoothly and cleanly...
    I think it has to do with memory management and bus thruput...i.e. the chipset.

    I made improvements with the nForce 2 board with BIOS tweaks, but it was never as good as I'm getting now.

    As far as my desktop PC is concerned, I was running an Asus 680i chipset with a Q6600 quad-core, overclocking of course, and it was VERY limited to as far I could go. It was also VERY picky with the RAM and power supply...
    Often times it wouldn't even POST with 'default' settings without having to remove a stick of RAM.
    My new board, Asus P5Q, with Intel P45 chipset is a marvel! Simply outstanding...I'm able to run my 2.4Ghz quad at 3.56Ghz easily (1776Mhz FSB!!)...RAM at 1180Mhz, all with just minor voltage tweaks.
    (Both quad boards ran liquid cooling as well)

  10. #20
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    What's the point installing a desktop PC in your vehicle if you aren't going to park the car, light a bowl and watch a movie or play games with passengers? If all you use your car PC for is to play MP3's, you might as well buy an i-pod and connect it to your car stereo..

    That said, you wouldn't catch me with a power hungry CPU in the car. I have a 35W TDP mobile Athlon 64 3000+, it's plenty. No need for a dual core 85w beast, unless your goal is to edit video quickly or play GTA IV.. I know I can max out my CPU while running MAME or something else, and I know that it's doing it efficiently. TDP is basically an average, so arguing that your cpu is never maxed out is beside the point. On average, it still draws a lot more power than a mobile chip which is designed to use a lot less than a standard desktop CPU. Save juice where you can, 2.5" HDD and a low power CPU are a must IMO. Of course i've built my PC around reserve capacity, and how long I can park the car and compute.

    Anyway, the M2 reportedly can fry everything connected to it if it's overloaded. That means your whole system is at risk. What I read awhile back was enough for me to completely forget about using the M2 I bought a couple years ago. Whether or not it was a rumor started to get people to buy the DSATX, i'm not sure, seems possible.. I didn't find many posts from owners saying their hardware was killed by the M2, but there are a lot of posts by people spreading the word (or rumor).

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