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#41
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On Sun, 20 Jun 2004 13:36:28 +0100, Miss Perspicacia Tick wrote:
Wes Newell wrote: On Sat, 19 Jun 2004 22:12:24 +0100, Miss Perspicacia Tick wrote: I have an FX-53 based system on an SK8V board in a CoolerMaster Wave Master case. The HSF is a Swiftech MCX64-V with a Delta fan and the PSU is a 480W Tagan. The rest of the spec is as follows: - 1GB RAM 3xSATA HDs (2xRaptor in a RAID 0 array plus a WDC) 9800XT 256MB Audigy 2 Platinum Pro XS Plextor 708A Samsung combi I have a *serious* issue with overheating - and I do mean *SERIOUS*. With the side panel on, it *IDLES* at between 60-65°C (140-149°F) and once, when I'm running it with the side off at the moment and it's stabilised at 45°C (113°F) - but I don't want to have to do that forever! I'm hoping The problem (at least one) is obvious from the above 2 lines. Fix your case cooling first. Well, DUH! I think I could have figured that out myself! THAT'S what I'm trying to do! Are you blonde by any chance? If it's 40C in your house and 25C outside, would you have to ask how to cool your house? How about creating some ventilation? And in case you didn't know, heat rises, so put exhaust fans high, intake fans low. Simple common sense should apply. -- Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB) http://mysite.verizon.net/res0exft/cpu.htm |
#42
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On Sun, 20 Jun 2004 16:02:31 +0100, Miss Perspicacia Tick wrote:
Just so we're clear - this http://tinyurl.com/2l4vq is the case in question...There is only ONE case fan at the back - that's it, there isn't room for any others. Well, according to the link you provided, the case has mounts for dual 80x80x25mm intake fans in the front, and one exhaust fan in the rear. Now where I come from that's 3, not 1. Now add the PSU exhaust and you have an even match of 2 intake in front and 2 exhuast in rear. The only other thing to make sure of is that the intake fans don't have restricted air. Most cases DO restrict airflow. That's easily overcome by doing away with the restrictions. -- Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB) http://mysite.verizon.net/res0exft/cpu.htm |
#43
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On Mon, 21 Jun 2004 04:14:50 GMT, Hellmark
wrote: kony's last words before the Sword of Azrial plunged through his body we But there is no gain to doing it. Beyond a certain point the adapter is adding so much air volume between the fan and 'sink that it's robbing the fan of CFM by maintaining this pressurized region. The optimal fan size is that where the opening is matched to the 'sink fins, while the fan sits as near the 'sink as possible, not raised up off of it more than a few mm. Depends on the sink, there are a few setups meant for larger fans. What sink is meant for a fan larger than 120mm? Motherboards simply aren't designed to have that large an area around the socket, even if a 'sink were made to accomodate a 120mm fan, that fan would mostly hang outside the fin area, where the greater portion of the airflow didn't pass though the hotter portion of the fins. Even Thermalright's SLK series, some of the very best air-coolers, which will take a 92mm, show very little benefit beyond that seen with a similar 80mm fan. By similar, I mean the noise level isn't even lower with the 92mm fan unless both were running extremely slow, under 1000 RPM, at which point the 92 mm is slightly better, but her system is looking like it needs the opposite, an even higher RPM fan, _IF_ no other remedy suffices. |
#44
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On Mon, 21 Jun 2004 06:18:05 GMT, kony wrote:
On Mon, 21 Jun 2004 04:14:50 GMT, Hellmark Depends on the sink, there are a few setups meant for larger fans. What sink is meant for a fan larger than 120mm? I meant, "What sink is meant for a fan larger than 92mm?" There are some Zalman (flower?) coolers with the separate fan bracket, but they are not suited to hotter running CPUs, for the same $ a CPU would be cooler with something else, like one of the Thermalrights... which are deeply discounted from time to time, the last SLK-947U I bought only cost $20. |
#45
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On Sat, 19 Jun 2004 22:12:24 +0100, Miss Perspicacia Tick wrote:
I have an FX-53 based system on an SK8V board in a CoolerMaster Wave Master case. The HSF is a Swiftech MCX64-V with a Delta fan and the PSU is a 480W Tagan. The rest of the spec is as follows: - 1GB RAM 3xSATA HDs (2xRaptor in a RAID 0 array plus a WDC) 9800XT 256MB Audigy 2 Platinum Pro XS Plextor 708A Samsung combi As a temporary measure, until you add more fans to your case, reduce the clock rate on your CPU. Reducing the clock rate will do two things for you, 1) it will give you more timing margin. 2) It will reduce the power consumed by the CPU. If you step the clock rate down enough you will also be able to lower the core voltage. Power is V^2/R so reducing the core voltage reduces the power dramatically. BTW that's what AMD is doing for their 30W and 50W Opterons. The "low power" parts are just fast parts that are run at a lower clock frequency and a lower core voltage. |
#46
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General Schvantzkoph wrote:
Power is V^2/R so reducing the core voltage reduces the power dramatically. I think that heat production in a chip is more about capacitance than resistance. The voltage and capacitance (and switching time) will affect the amount of current that flows, and that will determine the heat production. Ben -- A7N8X FAQ: www.ben.pope.name/a7n8x_faq.html Questions by email will likely be ignored, please use the newsgroups. I'm not just a number. To many, I'm known as a String... |
#47
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"Ben Pope" wrote in message ... General Schvantzkoph wrote: Power is V^2/R so reducing the core voltage reduces the power dramatically. I think that heat production in a chip is more about capacitance than resistance. The voltage and capacitance (and switching time) will affect the amount of current that flows, and that will determine the heat production. Ben Capacitive Reactance (Xc) If you had a pure Capacitive circut then the P = V^2/(Xc) might be correct Of course, it's a ton more complicated than this in a processor.. and I would have to wonder just how much total capacitance there is in a processor (I wouldnt guess it's a lot given it's size) ;P |
#48
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On Mon, 21 Jun 2004 20:54:31 +0100, wrote:
"Ben Pope" wrote in message ... General Schvantzkoph wrote: Power is V^2/R so reducing the core voltage reduces the power dramatically. I think that heat production in a chip is more about capacitance than resistance. The voltage and capacitance (and switching time) will affect the amount of current that flows, and that will determine the heat production. Ben Capacitive Reactance (Xc) If you had a pure Capacitive circut then the P = V^2/(Xc) might be correct Of course, it's a ton more complicated than this in a processor.. and I would have to wonder just how much total capacitance there is in a processor (I wouldnt guess it's a lot given it's size) ;P The leakage current is the resistive part, the capactance is reactive. The capactive part dominated in earlier generations but as line widths have become smaller the leakage has become much more significant. In both cases the power is related to the square of the core voltage. The reactive part is linearly related to the frequency, so reducing the clock frequency reduces the reactive power. If you lower the clock frequency and lower the core voltage you get a very large reduction in power. |
#49
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rstlne wrote:
"Ben Pope" wrote in message ... General Schvantzkoph wrote: Power is V^2/R so reducing the core voltage reduces the power dramatically. I think that heat production in a chip is more about capacitance than resistance. The voltage and capacitance (and switching time) will affect the amount of current that flows, and that will determine the heat production. Ben Capacitive Reactance (Xc) If you had a pure Capacitive circut then the P = V^2/(Xc) might be correct Of course, it's a ton more complicated than this in a processor.. and I would have to wonder just how much total capacitance there is in a processor (I wouldnt guess it's a lot given it's size) ;P No, but there are 50Million transistors being charged and discharged around 2Billion times/s = 100 * 10^15 charges and discharges per second. So they might be small, but there are a considerable number of them. Thats rough for a P4 working at 100%, which would probably melt it pretty quick. Still, an order of magnitude doesn't make a whole load of difference :-p Ben -- A7N8X FAQ: www.ben.pope.name/a7n8x_faq.html Questions by email will likely be ignored, please use the newsgroups. I'm not just a number. To many, I'm known as a String... |
#50
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Ben Pope wrote:
General Schvantzkoph wrote: Power is V^2/R so reducing the core voltage reduces the power dramatically. I think that heat production in a chip is more about capacitance than resistance. The voltage and capacitance (and switching time) will affect the amount of current that flows, and that will determine the heat production. In CMOS logic the action consists of charging and discharging many small capacitances at the clock rate. The charge q transferred is proportional to V and C, i.e. dQ = CV. The time interval dT is inversely proportional to frequence, so the effective current I is dQ/dT, and the effective power is V*I. Since q is proportional to V, that gives the usual power vs V squared relationship, but power is also directly proportional to frequency. Just keep your eye on the fundamental ball, power is voltage times current. -- Chuck F ) ) Available for consulting/temporary embedded and systems. http://cbfalconer.home.att.net USE worldnet address! |
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