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AMD Phenom II TDP and underclokcing / undervolting

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  • Mr. Hilarious
    replied
    Originally posted by Thatguy View Post
    the stock 1055t cooler is actually pretty nice " if you get a retail box cpu kit"
    Originally posted by droidhacker View Post
    The stock coolers are ok, if you don't mind them being CRAP.
    Originally posted by Thatguy View Post
    its such a piece of crap that I was able to overclock my 1055t from a stock setting of 2.8ghz to 3.9ghz on air.
    Heh, I started a small flame war

    But seriously, thanks for your input, though you never answered my question: which one is better, the 65TWP processor, or the 95W hexacore underclocked to an equivalent clock speed, in terms of current consumption? Another way to put my question: are there measurements, that approximately shows the TDP in relation to the clock speed? Or TDP vs. power steps graph when using Cool'N' Quiet? Is the curve linear? Or, does the slope get higher at higher clock speed? Remember, more current = more heat = more noise.

    After posting the thread, I figured, that of course you can always lower the clock speed... that's what Cool'N'Quiet is all about (and also lowering the voltage, IIRC, although quite conservatively). After booting to Linux, probably just editing the highest frequency step, or limiting the PM governor to the lower ones, should be enough to acquire what I want. IIRC, in Linux editing the power steps is possible, tought I'm not sure.

    I believe that the 95W underclocked by 200MhZ (that's their clock speed difference) won't do much difference, so I'm leaning towards the quad core at the moment.

    Maybe I'm at the wrong forum. I might get more attention at spcr forums for this question

    About stock coolers: in my experience the stock coolers are the minimum (or near minimum) you need to safely use a processor. Never QUIET by my standard (and, quietness is a subjective thing). While it might be that AMD has put some effort on their stock cooler, I doubt that the stock heatsink is better than the Scythe Ninja I currently have (I'm not going to put a dedicated CPU fan in there). I conclude that AMD might have the same heat sink and cooler for their 125W and 95W lines of AM2/3 socket processors (perhaps for simpler mass producing). That might explain why you get good results with overclocking on the stock cooler.

    Currently I have two Nexus test winners (don't remember the model) sucking (in terms of pressure, of course, not sucking as in being CRAP ) right next to the Ninja Mini. Look at here to get a picture of my setup. (Same case as in the review ) I think the current fans I have start to sound annoying if another one is running at =>1200RPM (i.e. I hear them without needing to concentrate on them). But that is the case only when I'm doing something CPU intensive, not when listening to classicfm.nl


    Cheers!

    Leave a comment:


  • Thatguy
    replied
    Originally posted by droidhacker View Post
    The stock coolers are ok, if you don't mind them being CRAP. There is a high frequency noise that comes from some transistor that is part of the PWM crap... the fan is TRULY low quality junk.
    its such a piece of crap that I was able to overclock my 1055t from a stock setting of 2.8ghz to 3.9ghz on air. Wow what piece of junk.

    Leave a comment:


  • droidhacker
    replied
    The stock coolers are ok, if you don't mind them being CRAP. There is a high frequency noise that comes from some transistor that is part of the PWM crap... the fan is TRULY low quality junk.

    Leave a comment:


  • Thatguy
    replied
    Originally posted by Mr. Hilarious View Post
    Hi Forum readers!

    I have a HTPC (but not deticated - occasional gaming and some tinkering with stuff) setup (OS is Linux / Gentoo) and I'm going to upgrade the CPU (and add 2-4 GBs of RAM). Energy-Power -efficacy is important, because of NOISE. There's just one problem: I can't choose which CPU to upgrade to

    Currently it is running on AMD X2 4850e. The temperatures are VERY good on this 45W processor with the aforementioned exhaust fans just next to the Nexus Ninja Mini, even with full load it never gets above 50?C (in the summer maybe just there - now that the sun isn't heating this apartment to the 32?C ambient temperature, I really need to work getting the cores to 46?C).

    I have two processors currently in mind (that are available here):

    AMD Phenom II X4 910e (2.6GHz, @65W TDP)
    AMD Phenom II X6 1055T (2.8GHz, @95W TDP)

    The price difference is negligible. I think that with the current cooling solution I'd have no problems cooling a 65W processor, but with a 95W TDP processor, I might run into problems. But, I read one can LOWER the multiplier on a non-BE Phenom II - so, if the cooling is insufficient, I could lower the multiplier on the X6 so that I'd run (when running at maximum speed) on 2.6GHz? If that is the case, I'd go for the extra two cores - or maybe even a 125W Phenom processor?!??

    So, any experience with underclocking / undervolting Phenom II's? Is there a lot of TDP to gain, say, undervolting the aforementioned 1055T? Or a 125W one (either a X6 or a higher speed X4)? Do these new processors have any stability issues when undervolting / underclocking?

    Cheers!


    the stock 1055t cooler is actually pretty nice " if you get a retail box cpu kit" and its not to loud. I have one in my wifes computer in the living room. I put a v8 on my cpu and went the other way with clockspeed. hehe.

    anyways, the fan is pwm so if you downclock, I got mine to 2.0ghz at 1.29volts" I only had to run the fan at like 15-20% total.

    It was nearly silent.

    Leave a comment:

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