Hi, Guys,
While working on my How to Make a Silk Purse out of a Sow's Ear project (It is running quite nicely BTW, I finally did an inventory of my parts cabinet and discovered I had enough parts to build the MITX custom loop gaming system that just never quite got to the top of my To Do List.
The key components I found are an I9-9900KS CPU and a Gigabyte RTX 3080 Waterforce GPU!
I needed to determine what radiator would be required, so I went to Ms. Google to discover the maximum power required for each component. What I found was that :
I9-9900KS = 241wts(OverClocked) + RTX 3080 = 320wts (OverClocked) totaling 561wts required to be dissapated.
Gigabyte makes two versions of their Waterforce cards: one for custom loops with only the waterblock and one with the waterblock plus an AIO cooler. My searching found that the Gigabyte Waterforce RTX 3090ti had a max power = 480wts and was cooled by an included AIO of 360 x 120 x 30 mm.
Then I went looking for an appropriately sized radiator....and DAMN the manufacturers don't give you the watts dissapated!
But WAIT! If a 360mm radiator would safely dissapate 480 watts, then a 120mm should safely dissapate 160 watts!
And that formed the baseline for the table that appears far below.
But first a little about how I did my calculations and just a bit about Heat Transfer and Fluid Flow (just skip to the table if you trust some random guy on the forum with your CPU and GPU).
More than half a century ago I attended Naval Nuclear Power School and one of the tougher courses was Heat Transfer and Fluid Flow, so I used to know quite a bit about the subject.
There are three modes of heat transfer:
Conduction: heat transfered through direct contact between the radiator and its mountings. I ignored this mode because most radiator mounts are rubber to minimize vibration and also insulate the radiator from its mountings.
Rad Size : Watts Capacity:
120 x 120 x 30 mm 160
140 x 140 x 30 mm 225
240 x 120 x 30 mm 320
280x 140 x 30 mm 450
360 x 120 x 30 mm 480
180 x 180 x 45 mm 578
420 x 140 x 30 mm 675
200 x 200 x 45 mm 720
180 x 180 x 100 mm 1283
200 x 200 x 100 mm 1600
For those few of you who have the fortitude to endure the length of this little essay, PLEASE comment and ABSOLUTELY give me any errors you discover!
Larry
While working on my How to Make a Silk Purse out of a Sow's Ear project (It is running quite nicely BTW, I finally did an inventory of my parts cabinet and discovered I had enough parts to build the MITX custom loop gaming system that just never quite got to the top of my To Do List.
The key components I found are an I9-9900KS CPU and a Gigabyte RTX 3080 Waterforce GPU!
I needed to determine what radiator would be required, so I went to Ms. Google to discover the maximum power required for each component. What I found was that :
I9-9900KS = 241wts(OverClocked) + RTX 3080 = 320wts (OverClocked) totaling 561wts required to be dissapated.
Gigabyte makes two versions of their Waterforce cards: one for custom loops with only the waterblock and one with the waterblock plus an AIO cooler. My searching found that the Gigabyte Waterforce RTX 3090ti had a max power = 480wts and was cooled by an included AIO of 360 x 120 x 30 mm.
Then I went looking for an appropriately sized radiator....and DAMN the manufacturers don't give you the watts dissapated!
But WAIT! If a 360mm radiator would safely dissapate 480 watts, then a 120mm should safely dissapate 160 watts!
And that formed the baseline for the table that appears far below.
But first a little about how I did my calculations and just a bit about Heat Transfer and Fluid Flow (just skip to the table if you trust some random guy on the forum with your CPU and GPU).
More than half a century ago I attended Naval Nuclear Power School and one of the tougher courses was Heat Transfer and Fluid Flow, so I used to know quite a bit about the subject.
There are three modes of heat transfer:
Conduction: heat transfered through direct contact between the radiator and its mountings. I ignored this mode because most radiator mounts are rubber to minimize vibration and also insulate the radiator from its mountings.
Radiation: Heat transfered by emitting infrared radiation. The is calculcated by the Stefan-Boltzmann law of radiation: Qt=σeAT4 , where σ = 5.67 × 10−8 J/s · m2 · K4 is the Stefan-Boltzmann constant, A is the surface area of the object, and T is its absolute temperature in degrees Kelvin. This is also the equation that put me on Stupid Study at Reactor Operator School and still gives me a headache! It is nearly always less than 20% of total heat transer and I ignored it in developing the table below. Convection: This where almost all of the heat gets transfered. It is based on the annular area of the fan (Fan area - hub area) and the area of the fins. It also involves the velocity of the wind from the fan which I also ignored since I have no data on the fans Gigabyte used on the RTX 3090 Waterforce. And that is basically how I developed the table below. If there are any untrusting souls, or the merely curious, or math masochists who are interested who want to check my work, you can email me at <Redacted by Moderator> and I will send you a copy of the Excel spreadsheet I used in developing this table. It is sorted by radiator watts capacity and it is interesting how much heat the 180 and 200mm radiators can handle, very useful in managing space in an MITX case. |
Rad Size : Watts Capacity:
120 x 120 x 30 mm 160
140 x 140 x 30 mm 225
240 x 120 x 30 mm 320
280x 140 x 30 mm 450
360 x 120 x 30 mm 480
180 x 180 x 45 mm 578
420 x 140 x 30 mm 675
200 x 200 x 45 mm 720
180 x 180 x 100 mm 1283
200 x 200 x 100 mm 1600
For those few of you who have the fortitude to endure the length of this little essay, PLEASE comment and ABSOLUTELY give me any errors you discover!
Larry
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