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#11
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How many watts
Err, nope. Those watts are used to spin the fan blades. (Duh! Electric
motor.) A tiny amount is lost as heat in the form of bearing friction. -- "War is the continuation of politics by other means. It can therefore be said that politics is war without bloodshed while war is politics with bloodshed." "Grant Edwards" wrote in message ... On 2007-04-12, First of One wrote: Well, if you are going to count that, then include the few watts used to drive the cooling fan. :-) Those watts turn into heat as well. -- Grant Edwards grante Yow! What a at COINCIDENCE! I'm an visi.com authorized "SNOOTS OF THE STARS" dealer!! |
#12
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OP : How many watts
'Mr. Porter' wrote:
| Thank you all for the answers and the link especially. | | I water cool my video cards, soon, when the price drops I'll be water | cooling a couple of 8800GTX's | | knowing 145, gives me a number I can get my system to dissipate. x2 + 65 | for 345 watts _____ Glad we could help. I have a web page that hasn't been updated since before the Pentium 4, but it does include numbers useful for calculating cooling system capacity (I'm not even sure it CAN be updated - my ISP seems to no longer support this feature.) See http://home.mindspring.com/~pweldon/ . Phil Weldon "Mr. Porter" wrote in message news:lBpTh.5985$SK3.5628@trnddc03... | Thank you all for the answers and the link especially. | | I water cool my video cards, soon, when the price drops I'll be water | cooling a couple of 8800GTX's | | knowing 145, gives me a number I can get my system to dissipate. x2 + 65 | for 345 watts | | | | | | "Mr. Porter" wrote in message | news:ny8Th.16874$jS1.6223@trndny07... | How many watts of heat do 8800 GTXs put out on general | | do they tell us this stuff? | | | |
#13
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How many watts
On 2007-04-12, First of One wrote:
Err, nope. Those watts are used to spin the fan blades. And that all of that kinetic energy ends up as heat. (Duh! Electric motor.) A tiny amount is lost as heat in the form of bearing friction. Everything that's not stored as potential energy ends up as heat. That's simple thermodynamics. There's resistive loss in the motor, heat loss in the bearings, and shoving the air around heats it up. 100.00% of the energy consumed by a fan turns into heat. You're not allowed to destroy energy. You can convert it into mass, but that takes something like a particle collider -- not a fan on a video card. -- Grant Edwards grante Yow! Yow! Are we in the at perfect mood? visi.com |
#14
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How many watts
Remember the fan isn't just there to stir up the air, it actually propels
the air through a heat sink and out the back of the PC. The heat sink causes a pressure drop due to aerodynamic drag. Volumetric flow rate x pressure drop = power. Sure, the air eventually slows down, but then the heat is generated outside of the PC. The few milliwatts transfered to the monitor via the video cable eventually turn into heat as well. Hence the need to define your control volume. :-) -- "War is the continuation of politics by other means. It can therefore be said that politics is war without bloodshed while war is politics with bloodshed." "Grant Edwards" wrote in message ... On 2007-04-12, First of One wrote: Err, nope. Those watts are used to spin the fan blades. And that all of that kinetic energy ends up as heat. (Duh! Electric motor.) A tiny amount is lost as heat in the form of bearing friction. Everything that's not stored as potential energy ends up as heat. That's simple thermodynamics. There's resistive loss in the motor, heat loss in the bearings, and shoving the air around heats it up. 100.00% of the energy consumed by a fan turns into heat. You're not allowed to destroy energy. You can convert it into mass, but that takes something like a particle collider -- not a fan on a video card. -- Grant Edwards grante Yow! Yow! Are we in the at perfect mood? visi.com |
#15
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How many watts
On 2007-04-14, First of One wrote:
Remember the fan isn't just there to stir up the air, it actually propels the air through a heat sink and out the back of the PC. For some cards that's true. For others, it just stirs up the air. The heat sink causes a pressure drop due to aerodynamic drag. Volumetric flow rate x pressure drop = power. Sure, the air eventually slows down, but then the heat is generated outside of the PC. It wold be interesting to know how much of he power dissipated by the fan actually ends up as kinetic energy in the air. Unfortunately my fluid dynamics skills are pretty weak. The few milliwatts transfered to the monitor via the video cable eventually turn into heat as well. Hence the need to define your control volume. :-) -- Grant |
#16
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OP : How many watts
In article lBpTh.5985$SK3.5628@trnddc03, "Mr. Porter" wrote:
Thank you all for the answers and the link especially. I water cool my video cards, soon, when the price drops I'll be water cooling a couple of 8800GTX's knowing 145, gives me a number I can get my system to dissipate. x2 + 65 for 345 watts There is a power supply calculator here http://www.journeysystems.com/?powercalc "Mr. Porter" wrote in message news:ny8Th.16874$jS1.6223@trndny07... How many watts of heat do 8800 GTXs put out on general do they tell us this stuff? |
#17
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OP : How many watts
GMAN wrote:
There is a power supply calculator here http://www.journeysystems.com/?powercalc That calculator does not incorporate GeForce 7 series cards, among other omissions. Try this power calculator, use the free lite version, the pro version has a fee(!). http://www.extreme.outervision.com/psucalculator.jsp |
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