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Old 2nd April, 2007, 05:00 PM
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Hose Sizes

Hi Guys

Just setting up my water cooled rig and just noticed that the fittings on my 8800 water blocks are .5" and the rest of the fittings must be .25" is there a problem in running a .5" hose on a .25" fitting?
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Old 2nd April, 2007, 05:36 PM
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Yes...leaks. 1/4 inch hose is nasty for flow. 3/8 or above is preferred.

What components are you using?
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Old 2nd April, 2007, 06:13 PM
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got a Thermaltake Kandalf on the way but it isnt going to be until May until I get it However I have a Zalman Resinator 1v2 for the time being The problem is the Resinator is using 1/4" and the Danger Dan 8800GTX waterblocks are using 1/2"
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Old 2nd April, 2007, 06:19 PM
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Quote:
Originally Posted by Daston
got a Thermaltake Kandalf on the way but it isnt going to be until May until I get it However I have a Zalman Resinator 1v2 for the time being The problem is the Resinator is using 1/4" and the Danger Dan 8800GTX waterblocks are using 1/2"

To tell you the truth, I do not think that reserator will keep up with the 8800 and the CPU. You will end up with an aluminum pressure cooker on your desk. Probably sell the Zalman unit and pick up some DD parts to go with that nice VGA block
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Old 2nd April, 2007, 06:23 PM
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Sell it in the classifieds. Maybe for an amount of money I can afford and...
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Old 2nd April, 2007, 07:51 PM
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Ok fair cop I will put it in lol
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Old 2nd April, 2007, 07:53 PM
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however I now have one very nice slim 8800 looks funny against my other 8800 that still has the fan on dont seem to be noticing any difference in performace either with out running the 2 cards
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Old 2nd April, 2007, 10:26 PM
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Are you saying that one card benches that same as SLI
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Old 3rd April, 2007, 07:42 AM
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ohh I havent even run a 3Dmark test yet good plan that man! I was basing it from playing EQ2 I dont think it likes SLI too much so that could be why it is running a bit better
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Old 3rd April, 2007, 09:36 AM
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Personally, with such a high-heat output component like a 8800, you'd be better getting some high-flow hose such as 1/2" (0.5). 1/2" is the most readily available to the general public (but if you can get 3/4", which i'm sure someone is selling, then go for that and get some adapters). Also, with 1/4 as you plan on using, there's chance of leaks (like said previously) and also, you're halfing the effectivness, despite the pressure being higher. With the added pressure, you're also gonna find it more difficult to get rid of bubbles and air-pockets.

That's unless you've already sorted something out.
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Old 3rd April, 2007, 03:26 PM
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Huh ???

Match the hoses to the connectors you have on your blocks and try to keep it consistant across the entire system.
As changing tube size creates quite a pressure difference.

Smaller bore means higher velocity flow for the same mass flow rate of fluid. Since your pipes arent going to be dead straight your not going to get laminer flow so you'll be in turbulent flow.
In which case wall sheer stress will increase and thus more of a pressure difference across the system.

Your system will have a total pressure drop which comprises of the difference in pressure through
-Blocks
-Tubes
-Height change across system (important!)

Typically a pump will be designed to give a certain flow rate for a given pressure difference.
Increasing the pressure difference usually results in a decrease in flow rate. (All depends on where your operating on the flow rate vs head pressure chart)

Increasing the working pressure, increases the ability to collapse air bubbles, its low pressure regions where bubbles can form (can cause cavitation).

Doubling the diameter, gives you 4x the cross sectional area. not double!
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