Whats a decent C/W for watercooling?

[Seiko]

Cel II566@876 (1.85v)

Amb=24C, SYS=28C, CPU=34C

As both my PSU and slot exhaust are running @7V and I haven't tried to use a fan with my radiator yet I think these are not to bad. I reckon I'm hovering with a C/W of .37 so I think there is room for improvement ?

Any idea on what a decent C/W for a WB should be?

: )

[Thelemac]

I'd say there's some room for improvement...put a fan on the radiator! :)

[mkelder]

A C/W of .10 should be expected from water cooling...

[Seiko]

Wow, 0.10 seems a big jump?

I'm sure just by adding a fan to the rad setup I won't be coming anywhere close to 0.10.

I guess I could try and increase flowrate? I'm currently pushing approx 0.7L per minute due largely to the heater matrix I use for a rad.

Even before I restricted the flow rate with the rad though my temps where very similiar although they increased as time went on.

Any suggestions?

BTW, I've got the Swiftech MCW372-B and I'm running 10mm hose?

[Thelemac]

It's going to be hard for you to get an accurate C/W with Watercooling as there are many more variables for the ambient temp that with air.

You'll probably see a huge improvement with a fan or two on your radiator, though. Helps get rid of a lot of heat in the water. :)

[Seiko]

Sorry 1 more question,

Surely the water temp can never really drop below the room ambient temp?

And I currently have the rad between the pump and water block? Would it not be better to use the radiator at the end of the cycle so that it removes the heat gathered by the CPU?

[Flow]

Originally posted by Seiko
Sorry 1 more question,

Surely the water temp can never really drop below the room ambient temp?

And I currently have the rad between the pump and water block? Would it not be better to use the radiator at the end of the cycle so that it removes the heat gathered by the CPU?

that's right. Without additional active cooling you can't get temperatures below ambient with water cooling.

Personally I think it's best to put the radiator between the pump/reservoir and the CPU, like you did. If you are running a submersible pump it will add some heat to the system as well. By placing the rad after your pump it will dump (a part of) that heat as well.

But you need at least one fan on your rad! most rads are designed to work with forced airflow. The cooling fins are to close together to facilitate "natural" circulation.

Good luck!

[sfa ok]

Can't the water get below ambient with a bong cooler?

[JML]

I've heard of people getting about a degree lower than the ambient temp

[William]

yes, the water can, but not by a whole lot. You need a fan on the rad and you should see a huge improvement. The more airflow on the fan, the better. Leave the setup like you have it, you really just need the fan to be added.

[mkelder]

well, .10 is what you should be aiming for at lest. My swiftech mc462 is doing .15 ....

[Warlord2]

I would say I get about .08 idle .13 load=]

I think thats not bad for a hot tbird=]

[TOMATOMAN]

A heard of bongs geting the water 4c below room temps but they can do better people over at [H] forums are working on a vortex bong wich show be nice :}

[train22]

it's useless telling us your C/W without the Vcore, a tbird at 1.7 will not have the same C/W as a tbird @ 2.2

[SteenkyBastage]

you're right my c/w ratio goes DOWN the more watts i put into it. my 1.2 @ 1.47 and 1.88v gets .9 c/w under load. but it only gets .10 without being oc'ed.

this is being measured with a probe touching the side of the core. and the watts are calculated with radiate.

[Morphoius]

Temps at the bottom of the CPU differ from the top of the CPU. if you get a independant temperature probe and put it right next to the CPU you will probably get a lower C/W

my C/W is .21 at 1460mhz and 1.94v measuring using MBM, but i don't trust this as the truth as i am using a bong watercooled setup.

[Seiko]

Originally posted by train22
it's useless telling us your C/W without the Vcore, a tbird at 1.7 will not have the same C/W as a tbird @ 2.2

Of course it is that's why I clearly stated 'Cel II566@876 (1.85v)' in my first post ; )

More testing last night. I placed a large household fan in front of my rad and managed to keep the temps 2C cooler.

Amb=24C, SYS=28C, CPU=32C bringing my C/W down to approx 0.29. Still a far cry from your results?

Not too sure what to do next really, it seems my poor case temps are still effecting the CPU temp even though my water cooling rig is external?

As soon as I open the case and blast inside with cool air both my SYS and CPU temp drops by 2-3C? but as I don't want to add more fans or run the existing ones at 12V I'm a bit stuck : (

C/Ws of sub 0.15 really seem to good to be true? By my calcs that means I should not rise 4C over Ambient even under full load?