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Originally Posted by freeloadingbum
http://www.xbitlabs.com/articles/vid...v-power_9.html
If you deduct for voltage regulators, ram and everything else, 50 watts should be a safe high estimate at the gpu. Also, in a system with a mcp600 and double rad, the flow rate difference should be alot less than your estimates.
My personal experience with a mcw50 showed no loss going from 1.5 to .75 gpm using atitool to overclock with on a 9800
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Well first I really did enjoy that article, thanks.
Please note that the O/Cs of the cards are on stock air, good after market copper coolers can do a bit better & not at all what I'd call high for a water cooled card with good copper sinks on the memory and a strong side panel blower blowing cool air over the card. There's a guy at Xtreme with a non Ultra 6800 at 492/1290 on water......I suspect there's some Ultras on water well over 500/1300. And those would be some high wattage cards.
Not sure what your referance to the MCP600 and double rads is about. A Iwaki MD20 could also be said to offer higher flows & larger differances between blocks than pH's numbers, but so what, (his set up has much higher resistences due to measurments taken.) I didn't estimate those differances in flow, they are from ph's testing data of the differant blocks as I posted. Check out the Pro Cooling interactive graph. And pH's numbers are accurate, which is a major help in comparisons.
I've not used the MCW50 block. But a open chambered and thick based block will do the most to dimenish the impact of flow changes. A block like the Fusion with a thinner base & micro fin internal structure will show up flow changes quicker.
On average I expect higher flows to result in higher clocks of a vid card. Every card is differant, but over a number of cards added cooling will show increases.