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Thread: How much is too much

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    ez_
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    How much is too much

    im wondering at what point is it too much. is it possible to rin a quadcore sli/crossfire gameing rig in your car. can the car battery power it? would a multibattery setup be the way?? how would you keep those batterys from dieing ect. whatever elese u can think of that might fit under whats too much.

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    MySQL Error soundman98's Avatar
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    it is realy more dependant on how much money you have and the power supply you can afford-- if you want to go all out, get a true sine dc-ac converter(see how much those cost ), and a 1000 watt power supply.

    most of the reason that most of us stay with low powered setups is because there is less heat, less power requirements, and most realistically don't need much cpu power-- gps, audio, and web(the most common features) really dont take too much of the cpu resources.

    there is nothing that says that you can't, just remember that the more power, the more problems that could come up...

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    No reason you can't. Just the question of why you would. It's not necessary in a normal car. If it's a show car, okay.
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    if your talking about a machine drawing upwards of 1000 watts plus which these days is more than realistic you are talking about over 100 amps fromt he batteries. Is it possible, YES but is it realistic, NO. In order to run such a machine for any length of time, not kill the battery, and be able to start the vehicle your looking at least two large AGM Deep Cycle batteries isolated from the starting battery with large cabling for all of it. I run more power than this in my truck for all of my stuff but I also have 3 large batteries, a big alternator and a diesel to run it.
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    Quote Originally Posted by ez_ View Post
    im wondering at what point is it too much. is it possible to rin a quadcore sli/crossfire gameing rig in your car. can the car battery power it? would a multibattery setup be the way?? how would you keep those batterys from dieing ect. whatever elese u can think of that might fit under whats too much.
    If I could offer my advice here...

    1,000 watt for SLI is too high, unless you're running a 4-way. Also, I'm pretty sure you can get quad cores at 95w.
    I have a real nice ABS Tagan 700w with REMI that supports SLI. It depends exactly which card you're using, but you should be able to run it on 500-600 with ease.

    But practically, unless SLI has changed drastically in the last few months - you're wasting your money. You'd get more Performance out of a single, higher-end card, and more compatibility. And you do not want a quad core for gaming..

    If you want me to explain "why," let me know.

    As to power draw.. Let's go to the safe, high-end and say you average 550w usage. 550 / 12v = 45.8a
    As I recall, the A/C on High draws 50-60A.. Correct me if I'm wrong, someone.

    The point is, if the car is running (especially if it's Moving), this should be doable. You might need a stronger amp or second amp, if you're not... But I know Much more about computers than I do about cars and electricity, so please don't take my advice without checking it.

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    And just to be realistic, an alternator puts out somewhere around 120 amps under full load. Here's the math on one:

    Amps = 120
    Volts = 13.5
    Watts = 120 X 13.5 or 1620 watts

    Running a 1,000 watt gaming rig in your car at max power will leave you with 620 watts headroom for your stereo system. If you run a 500 watt stereo system, you'll be left with 120 watts to run you headlights, which are probably in the 60 watt range for the headlights and let's say another 20 watts for your side and tail lights. That leaves 40 watts for ignition system, heater fans, headlights, ECU and of course, recharging the battery.

    And, running your alternator at full output generates a lot of heat in the alternator and will shorten its life. There may be periods when your alternator cannot supply all of the power needed and the battery will supply that power during those periods. It will need to be recharged - by the alternator, which is busy powering everything else.

    Figure in a certain amount of inefficiency due to resistance, connections and so forth and you will likely overload your stock alternator whether you have one or two batteries. You should budget for purchasing and installing either a second alternator or a higher capacity alternator.

    In addition, it probably make the most sense to leave the stock car and electrical system alone and have a completely separate electrical supply -including deep cycle battery, for the computer and audio system. If you know how to do that, great. Otherwise include custom installation and wiring as part of the cost.
    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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    Bug, what about a 500w drain? That should be a Safe number to get him a good gaming PC.

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    Sure, cutting it in half would help a lot. Plus, the example I gave assumes the rig draws 1,000 watts all the time. I'm sure it rarely does. Moving to a 500 watt rig would help immensely.
    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:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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    Quote Originally Posted by icor1031 View Post
    But practically, unless SLI has changed drastically in the last few months - you're wasting your money. You'd get more Performance out of a single, higher-end card, and more compatibility. And you do not want a quad core for gaming..

    If you want me to explain "why," let me know.
    just curious--why?

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    Quote Originally Posted by soundman98 View Post
    just curious--why?
    Very few PC games can support more than 1 core. You want atleast 2 though, so that the other can run the background applications, OS, etc. Adding a third, fourth core.. could there be benefit? I imagine so, but it's negated by price, overclockability, cache, etc. etc.
    If you're running SLI, you're probably a fairly high-end gamer.
    Unless he gets an i series, I do believe the Wolfdale has a higher IPC than the other intel quads.
    But more importantly, the wolfdale has a high cache and is easily overclocked. I.E., he should be able take an E8500 to atleast 4.2ghz.

    But this is mostly theory: practically, games are only cpu dependant at low resolutions (i.e. 1024x768.) When you get up around 1920x1080, increasing your CPU by 1ghz will only give you in the area of .5 to 1.0 fps increase. .. and even at lower res, 1680x1050, the cpu doesn't mean much... 3fps maybe?

    Now, there are some games that are CPU dependant. Think an RTS: Forged Alliance with 4,000 units on the map, which need a lot of path finding computation, etc. This particular game can use multiple cores, (although not very efficently.) so a quad could be useful. I am sure some RTS that are CPU dependant, cannot use more than 1 core - though. In which case, the wolfdale is still better. Higher clock, high cache, probably higher IPC.

    SLI is bad because again, not many games support it. (though a lot more support sli than do mutli-core.) With those that do, I seem to recall only about a 25, Maybe 40% increase as average... Some do better than others. The G92 8800 was around 90% - "very" good. Most do not see anything like this, though.. again, unless that's changed recently.

    Unless almost all of the games he wants support SLI, he's better off with a single, faster card even if he had a 100% increase from SLI.

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