What's in my laptop...
in [Hardware]
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From: GT on 13 Oct 2009 07:23 "kony" <spam(a)spam.com> wrote in message news:6su6d513o8dqvqs5meamdo2800dkvgcjpq(a)4ax.com... > On Mon, 12 Oct 2009 14:26:04 +0100, "GT" > <ContactGT_rem_ov_e_(a)hotmail.com> wrote: > > >>Brilliant, thanks. I'm not looking to overclock, but run as quietly as >>possible. Its just a basic PC connected to the TV for the kids to run >>CBeebies and silly little games on. No power required, but silence would >>be >>perfect! >> > > > You may have a lot of latitude with that CPU, depending on > what voltage, bus and multiplier settings your board > supports. > > Generally keeping in mind that it may boost performance > keeping a 1:1 FSB to memory bus ratio, it would be better > performance to set FSB and memory to the max your memory and > chipset revision supports, then set the multiplier depending > on what speed you want (you could even desire underclocking > it to reduce power/heat... and use lower speed fan for less > noise, the most possible), and give it enough voltage to > POST, and run Prime95's Torture Test stabily. > > That voltage can vary quite a bit on mobile chips. I expect > you can run stock speed at around 1.5V, but don't recall if > that might be under the stock voltage. Odds are good that > you can run the stock speed stabily at lower than the stock > voltage, but the heatsink you want to use factors in at some > point, this was an era when plain cheap all aluminum > extruded types started to not do so well anymore at full > load unless they had pretty large or high RPM fans. Thanks again. The setup is all in a Shuttle SK41 case. There is a spring mounted 3 heatpipe setup with a variable fan exhausing to the rear. The exhaust fan is noisy at anything other than its 'ultra quite' setting (slowest of 4 settings). I could replace the fan, but frankly, I don't know what db its putting out now, so don't know what difference a replacement would make. I had a desktop Athlon 2400 in there and the fan kept on changing speeds. As my old laptop has died I have put the mobile CPU into the shuttle hoping that it would silence things, but it seems to be running at 1.65v still. Clearly that would give headroom for quite a decent overclock, but I'm not after that - Silence is the target. Performance is not too important. I don't think the bios has any voltage settings, but I think there are frequency settings. Its downstairs and I'm lazy - doing my research before I dedicate any time to this! I'll hunt around for the latest bios and see what there is on offer. If I can't find a software solution, then I'll pinmod the voltage as low as I can at standard speeds. Must remember to put CPU Idle on there too! I know that makes a huge difference when the CPU isn't loaded.
From: kony on 13 Oct 2009 22:41 On Tue, 13 Oct 2009 12:23:56 +0100, "GT" <ContactGT_rem_ov_e_(a)hotmail.com> wrote: >Thanks again. The setup is all in a Shuttle SK41 case. There is a spring >mounted 3 heatpipe setup with a variable fan exhausing to the rear. The >exhaust fan is noisy at anything other than its 'ultra quite' setting >(slowest of 4 settings). I could replace the fan, but frankly, I don't know >what db its putting out now, so don't know what difference a replacement >would make. There's probably a sticker on one side of the fan hub that'll allow finding it's specs, but if the PSU has a variable speed fan circuit that responds to temperature, a slower (at default 12V) spec'd fan might just speed up faster till it reaches it's max possible RPM. It may not be good to try and slow down the fan though, if it's already spec'd for 3000 RPM or lower then heat is the next thing to reduce. Some athlon XP era boards didn't implement HALT idle bus disconnect feature, resulting in higher than otherwise possible idle temperatures. The thinking at the time was that some PSU couldn't ramp up 5V current fast enough to compensate and they left things that way even when systems went to using 12V current for the CPU. A google search something like this might find some utilities or manual settings to enable that if it's disabled (and if the bios doesn't have adequate settings), though it does nothing about full load temps. http://www.google.com/#hl=en&source=hp&q=Athlon+bus+disconnect+HALT >I had a desktop Athlon 2400 in there and the fan kept on >changing speeds. As my old laptop has died I have put the mobile CPU into >the shuttle hoping that it would silence things, but it seems to be running >at 1.65v still. Clearly that would give headroom for quite a decent >overclock, but I'm not after that - Silence is the target. Performance is >not too important. Google for Athlon pinmods, there are ways to make a CPU run at lower voltage though the trick will be if the board can POST at the lower voltage since you wrote there are frequency settings it could enable once it loads and applies the CMOS user-adjustable settings. Come to think of it there are pinmod options for FSB too, but how much work you want to put into this I don't know... > >I don't think the bios has any voltage settings, but I think there are >frequency settings. Its downstairs and I'm lazy - doing my research before I >dedicate any time to this! I'll hunt around for the latest bios and see what >there is on offer. If I can't find a software solution, then I'll pinmod the >voltage as low as I can at standard speeds. If it supports lower multiplier, lower that first leaving FSB as high as you reasonably can, especially if it has integrated video that will keep memory bus higher for better video performance. > >Must remember to put CPU Idle on there too! I know that makes a huge >difference when the CPU isn't loaded. Those systems were fairly popular, I wonder if anyone has modified a bios for it to enable more voltage, multiplier, etc, settings. Lower the frequency enough and you should be able to run below 1.5V, minimum varies per board design but I would guess down to about 1.2V if you needed to.
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