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Water cooled back plate?

post #1 of 9
Thread Starter 
So, I was just thinking... rolleyes.gif

Would a water cooled back plate be an easy solution to cool the off parts of a gxf card? I have a core only block EK HF (gpu version), and gluing the little passive vrm coolers is a pita. Besides they don´t look particularly good.

Then I noticed some cards come with stock coolers that don´t cover the vrms at all. So, a thermal pad, the size of a nvidia 560, a copper block the same size, simple fin design. And voila, sufficient cooling for all off parts of a gfx card?

Or, would the pcb just not carry enough heat through to the water cooled back plate?

...no more thinking for me

/otPi
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post #2 of 9
'fraid that wont work.

you wont transfer enough hear through a layer of air and the circuitboard. IMO you really do need the heatsinks.

OFC I don't know exactly what the heat generated in each part of the GPU is, the core obviously produces the most. You might be able to get away with not cooling some parts. but then again, maybe not. Are the little passive coolers that bad? : /

I mean what you're saying is very interesting and you could produce some good results, but making blocks that cover everything wont be easy if the intricate block designs I have seen on other full cover blocks is anything to go by.
    
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post #3 of 9
I don't know if this is what you're talking about or not, but it sounds like it. You could make it, but the way it's being described is a little vague...

GTX560TIHS.png
That, but making it yourself?

Also, if that is what you're talking about, why are you calling it a backplate? The backplate is the part that sticks up when the card is installed:
backplate_thumb.jpg

People say that a backplate dissipates heat, but it really doesn't since there is a large air gap between it and the PCB itself. I've used an infrared thermometer on the back of my overclocked 6950 cards (where the backplate would normally be, but isn't because I've installed waterblocks that don't fit the backplate) and the temps rarely get over 50c or so, and are usually warmest around the RAM chips. I've never really thought of actively cooling them since the temps are never high, even when benching and whatnot. My mobo heatsink gets a fair bit warmer, but Asus thinks it's fine passively cooled, so I leave it, just as I leave the backsides of my video cards.
post #4 of 9
Quote:
Originally Posted by OnetwoPi;13844345 
Or, would the pcb just not carry enough heat through to the water cooled back plate?

...no more thinking for me

/otPi

lol...

You really dont need to cool the backside when you got sinks on the hot spots.

The only exception to this rule would be if u had ram on the underside of your card like how it used to be on the 280 + 285.

Probably will see it again on the 580 3gb.

But if u got cooling area's directly on the hotspot, the underside will be kept in check.
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post #5 of 9
Does this card in question have ram on the backside? If it does, good contact with the PCB won't be easy. If it doesn't, you could do it, but it would still be as proprietary to the card as any other full cover block. Most surface mounted components are sunk to the PCB, so the heat transfer would be fine, but there doesn't seem to be any simplification or cost reduction to this set up.
    
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post #6 of 9
Thread Starter 
I called it a back plate because that´s the part i wanted (was thinking) to water cool ^^

May have been to vague. The thought was to sandwich the card between two water cooled blocks. Like dr.gumby said, if the backside of a gfx card gets up to 50 degrees C then a nice cool piece of copper should do it good?

A good sized thermal pad would be used to close the gap between pcb and block, and to prevent shorting the circuits.

Backside of a card is usually free of obstructions. So it could possibly be reused.

Speaking of which; My 800D has a big panel in the mobo-tray that can be removed to get to the backside of the cpu. Anyone ever tried to sandwich a cpu between two water blocks?

These ramblings of mine is only because I started thinking it was strange that we put so much work into removing hundreds of watts of heat from one side of the heat source only?

Anyone up for the task? I´d like to see before and after temps of a 2600k cooled from one and both sides of the mobo tongue.gif

/otPi
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post #7 of 9
yeah but u ignore a backblock of that size will add a significant amount of weight.

Full card blocks are heavy as it is, and having another one on the other side sandwitching the block would make it weigh more then the og 9800GX2 blocks that came out.

And that was a heavy beast.
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post #8 of 9
Thread Starter 
With regards to the weight I do not think it would be a problem. At least for a vertically mounted cpu block. The problem with heavy coolers is the bending moment created, in addition to the compression forces caused by the weight. Bending moments have to be carried by the pcb and bending is bad for mobos. Adding the same weight to the opposite side will negate the bending moment and the weight is carried by the pcb as compression forces only.

I've spurred my own curiosity. Once I get the new 2600k rig in-house I'll see what I can do with my two EK HF blocks. Thinking of:

1. Mount cpu block.
2. OC
3. post pic and brag
4. mount 2nd block on the backside (this depends on how the back of the card looks...)
5. OC some more
6. compare results
7. post more pics

tongue.gif
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post #9 of 9
well yeah if ur using a hori design or a raven style it will work.

But i can say with confidence 90% of the cases out there, that can even fit half the h2o gear internally are all normal motherboard layouts.
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