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mcw60 block mod

post #1 of 11
Thread Starter 
Would it be of any benefit to take make the base smooth and get rid of the square in the center.

I ask this because the G80 core on the 8800GTX is as big as the base. I know that the internal contact area is not as big as the external base.

I think taking it down level and lapped would be good.

What do you think worth doing or not?
    
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post #2 of 11
yup i think thats worth a shot, it should get better temps, as the heat transfer has less resistance and has to go through less copper to get from the GPU to the water, so give it a shot.
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post #3 of 11
Thread Starter 
That's what I thought...I'll take some pictures when I do it.
    
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post #4 of 11
Uh...Isn't the square in the center so it will fit down between the shims and make good contact with the core? If not it should help...
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post #5 of 11
NO DONT!!!!!.....

the actual core is less than the size of the middle square... the ihs cover is only that big to spread heat in combination with the stock cooler...

please tell me you havent done it...
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post #6 of 11
Just be very certain you wont break into the inside of the WB. No need to ruin a perfectly good WB.
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post #7 of 11
i think these guys have a VERY good point...the IHS heat spreader actually sits BELOW the mounting block around it...shaving the water block smooth will not allow the copper base to even make contact with the IHS....i wouldnt do it...take a straight edge and lay it across the mounting plate on the GTX and you will see what im talking about.
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post #8 of 11
I thought about this the first time I looked at the block and spent a great deal of time searching the net for the die size and found that the base is big enough to cover the actual die so it's fine stock.

You might actually make temps worse because now all your valuable block pressure will be wasted in the non die areas. Leaving it with the step actually gives you some similar advantages that bowing the base of a CPU block does.

In the end I decided to leave it and try it as is...couldn't be more happy with my GPU temps and have yet to find another block as good so my vote goes towards leaving the step there. I'd still be curious to know what if any difference there would be, but I'd first want to see a direct comparison to it as stock.

If you decide to do it, can you first try with the block stock and burn in the TIM paste with some good ambient reads and then follow up with the results of the mod?
    
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post #9 of 11
Thread Starter 
what makes contact with the large heat spreader other than the gpu...

If my card was a ATi I would leave the step for shure because you the block makes direct contact with the core...

The G80 has that big heat spreader on top......Are you guys saying take it off or leave it.

If I leave it on there is an air gap all around the edges due to that flat gpu heat spreader..

I think I get what you are saying the core is only in the center of that big heat spreader so leave the step so only to suck up the heat in the center....is this correct
    
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post #10 of 11
Yes exactly, the same idea as bowing the base of a CPU block. Can't find the link now, but the only important area to cover is the die under the IHS and it should be better to get better contact just over the die than to have the whole IHS covered.
    
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