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Noise Levels
Water cooling can be a step up in the cooling department, but it’s also a way to decrease noise levels. If you select the correct 120mm (or larger) fans to cool down the radiator you can run them at very low speed and keep high performance. Our test setup consisted of an external water cooling housing with two rather noisy 120mm fans, the pump, even running at 12V, was hardly noticeable, but the fans were picked up clearly by the dBA meter.
 ambient noise level = 40,1dBA
When the auto fan speed is set on the Stock NVIDIA heatsink the card remains quite silent, you can force the fan to run at 100% but this increases noise level to ~47dBA. Performance wise temperatures drop by ~10°C. I’m quite tolerant to noise, as long as it’s not Delta/Vantec Tornado level, so my choice of fans might not be the “quiet man’s” best friend. I’d rather have those extra frames in-game with speakers blasting at full force, than to not hear my PC running. The perception of noise is a very subjective matter so I can't fault these water blocks for being “noisy”, how can they be, they are just metal blocks. Choosing the “silent” components to build you WC setup is the deciding factor, our tests revealed only a negligible decrease in performance when using slower fans.
Water- vs High-End Air-Cooling
We had to wait a while but finally some manufacturers released 3rd party air cooled heatsinks for the Geforce 8800 series, first up was the MACS M-Sorceress II, available separately or pre-installed on cards like the Calibre 8800 GTS we reviewed. The second alternative to the stock heatsink was provided by Thermalright, their HR-03 Plus which we tested in-depth here, provides a remarkable increase in cooler power. This heatsink is heat pipe powered and relies on a 92mm fan of your choice to provide airflow; this leaves the choice to the end user whether he wants high performance, quiet operating (even fanless) or a bit of both. We used a Sunon KDE1209PTB1-6 92mm fan which provided a lot of airflow, but made the dBA meter spike to ~55dBA.
Let’s put all the results in one nifty chart to see how they performed:

Conclusive Thoughts
The MCW-60 from Swiftech is by far the best performing water block we tested yet, people aiming for lowest temps should definitely go for it. Keep in mind that you could come across small problems during the install procedure, and you also might want to be looking for third party thermal pads because the original thermal pads applied on the MC8800 SMC cooling kit did not stick very well (White paste helped for us, though this will dry out in little time which eventually causes the heatsinks loosing it grip). Price might be on the high side but with all those different mounting kits included this block offers compatibility with most of the latest VGA cards (AMD R600 mounting kit coming up?). Thanks to its low profile this block is also SLI compatible, but will require some extra loops of tubing.
The installation of the NV-88GTS-PC from Danger Den was straight forward, less experienced users can't go wrong with this block, as cools both GPU and Memory chips and the water tube fittings can be configured to point either way, making it compatible with different case layouts, this same fittings system is also responsible for a seamless SLI integration, where two blocks can be installed without much hassle or extra tubing. Performance wise it trails the MCW-60 but with load temps still noticeably better than stock (-10~20°C !) it’s hard to say it under performs. The HR-03 Plus air cooled heatsink from Thermalright does match the NV-88GTS-PC performance numbers but needs a loud fan to accomplish this, the Danger Den block does not restrict water flow a lot and will keep the G80 running cool even when you undervolt the water pump and/or fan(s) on the radiator. The downside of the NV-88GTS-PC can be found in its name, the block only works with Geforce 8800 GTS video cards, making it an expensive one time purchase of $134.99.
What we haven’t look at in-depth in this review is extra overclocking potential with these high performance water blocks installed, in our recent G80 Overclocking Guide we looked at the temperature side of things when the G80 is overclocked and overvolted, temperature on the GPU rose more than 15°C, and that was with voltages and speeds nowhere near the limit. With these water blocks your overclocking experience will be quite positive, as heat will no longer be an issue, our overclocking tests revealed only very small GPU temp increases with either block, this allows you to find the maximum GPU and Memory speeds without worry for overheating.
Let’s wrap up our experience with both Geforce 8800 water cooling solutions.

Swiftech MCW-60 + MC8800 SMC cooling kit Recommended for

+ Best retail VGA G80 cooling solution + Excellent compatibility (different VGA cards and Tubing Sizes) + Low Profile = SLI ready + Excellent Build Quality, Sleek Looks - Installation of mounting brackets needs minor fixes - Thermal pads on memory heatsinks not very adhesive (see update bottom of page!) - Price on the high side: $46.95 (MCW-60) + $39.95 (MC8800 SMC cooling kit)
DanderDen NV-88GTS-PC Recommended for

+ Excellent Geforce 8800 GTS Cooling + Easy installation + Excellent Build Quality + Possibility to choose for smaller fittings when ordering your block + Cools both GPU and Memory Chips + Configurable fittings (direction) + Made with SLI in mind: low profile - Restricted compatibility (only Geforce 8800 GTS) - Minor issue: no INBUS screwdriver included - High price premium $134.99
We would like to thank Dan from Danger Den and Gabe from Swiftech for allowing us to test drive their product; Until next time!
Update: Swiftech thermal pads
We were informed by Swiftech that since May 2007 (our samples are dated before May) they have switched the adhesive thermal pad for the memory heatsinks seen here. The new ones are much stickier and won't fall of easily.
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