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WACC Dual Radiator and P/A Reservoir WACC Dual Radiator and P/A Reservoir: We take a look at a couple new additions to the WACC lineup which are a new dual radiator and passive active reservoir.
Date: July 21, 2004
Manufacturer:
Written By:

Test Setup

ABIT AN7, Athlon 2500+ @ 3200+ (11x200, supplied by ), 2x 256 Corsair PC3200, 1x 512 Corsair PC4000, 80GB WD 8MB Cache, Windows XP SP1, Forceware 3.13’s, ATi Catalyst 4.6, Detonator 61.04’s, Antec P160 Case

Watercooling Setup (including flow order)

WACC MK I Reservoir with MaxiJet 1200 (1100 LPH) pump - Dual Row Rad - WACC Aluminum CPU block - WACC Northbridge Block - P/A Reservoir

120mm Evercool fan @ 12v, 4v and 0v (controlled by Vantec Nexus 3 Channel Rheobus)

For comparison, the Three Row Radiator without the P/A Reservoir (our original setup) was used, and then the Three Row Rad was swapped out for the Dual Row Rad. Finally the P/A Reservoir was added to the loop. Also, the MK I reservoir and pump setup is no longer sold, but the MaxiJet pump is used in an inline manner rather than submerged, although this shouldn't overly effect our results here.

Testing Methodology

As with all temperature related reviews we do, the system was allowed a few days to bed in and settle down, then readings were taking both from idle and under load multiple times, with the temperatures averaged out for the final results. Results were taken when the room temperature was 25C (+ or - 0.5 C) and any other results ignored. For idle, the PC was warm rebooted and left doing nothing for 15 minutes.

For load testing, Folding@Home was run for at least an hour as well as a looped series of timedemos from Quake III Arena (3 different, one run after the other). Temperatures were taken using a Lian Li Digital temperature probe placed next to the core of the CPU. Arctic Silver 5 (provided by ) was used throughout.

Dual Row Radiator Results

Swapping the original Three Row Rad for the newer Dual Row Rad, we put the system under load and noted down the results. All temperatures are in degrees Celsius. You can use this for Fahrenheit numbers.

Idle
3 Row
2 Row
12v
34
34
4v
35
35
0v
n/a
n/a

Idle Temperatures in Celsius

Load
3 Row
2 Row
12v
38
39
4v
39
40
0v
n/a
n/a

Load Temperatures in Celsius

I've not seen any large differences in the temperatures when comparing the Three Row Rad to the Dual Row Rad, although the load temperatures are 1C lower under load on the Three Row Rad. However, do bear in mind the compact nature of the Dual Row Rad when compared to the Three Row, and of course there is the price difference too, making the Dual Row Rad a better buy for all but the most hardcore. Being as compact as it is, and still being able to perform on par with the larger Three Row is a nice thing to see, especially if you want to mount the rad in your case. Having the Evercool fan at only 4v (its lowest, any lower and it cuts out completely) provides a virtually silent system all bar the actual air moving. Unfortunately, without some form of active cooling on either rad, the temperatures kept rising, albeit slowly, and at 55C I turned the fans back on (yeah, I'm a chicken).

P/A Reservoir

Keeping with the Dual Row Radiator, we added the P/A Reservoir into the loop between the north bridge block and the original MK I reservoir and pump.

Idle
2 Row
P/A Res
12v
34
33
4v
35
33
0v
n/a
38

Idle Temperatures in Celsius

Load
2 Row
P/A Res
12v
39
38
4v
40
38
0v
n/a
47

Load Temperatures in Celsius

Adding the P/A Reservoir into the loop produces some really interesting results. At idle with a 12v fan, we have a 1C drop on the previous setup, but lower the fan speed to 4v and the idle temperature remains the same. Using the scientific method of "does it feel warm to the touch?", well at 12v the P/A Res feels quite cool. Its warmed up that's for sure, and is obviously drawing out some heat, but the water isn't that warm since its been cooled by the rad and 120mm fan. Reducing the fan speed to 4v and you really notice a rise in temperature from the P/A Reservoir, as the work load is transferred from the rad to the res. However the temperature of the CPU remains the same, 2C lower than with just the radiator and of course the noise level drops too. The best part though, has got to be the 38C idle without fans. It's very strange to cut out not only the noise from the fan, but also the almost silent turbulence of the moving air disappears too. If I also kill the front intake fan, apart from the occasional click from the hard drive and the slight vibration from the pump, the system becomes eerily silent. It's still a very foreign sound to me, or rather a lack of it and despite the obvious fact that the system is running (as evidenced by the fact that the monitor is on and displaying Windows) I still physically look at the system now and then to double check for a power LED. Since my PC is in the bedroom, having the ability to run silent is very welcome.

Under load we see a similar picture as before. A 1C drop from the previous setup at 12v on the Evercool fan, and at 4v the drop is 2C again, keeping the load temperature at 38C, 2C lower than with the Dual Row Rad alone. Without any fans then the P/A Reservoir does begin to struggle, but still puts in an impressive 47C under load without any fans. The other thing to note is the extended periods of time it takes for the temperature to change. For example, while the temperature changed from 33 to 38C quick enough, 38 to 47C took a lot longer; it took me a ½ hour before I was able to get a sustained reading of 47C as the temperature slowly rose from 38 to 40 and then began to slow down on its climb to 47C. This bodes well for those with real furnaces of CPU’s such as a Prescott, as during a fan failure the P/A Res could do its part for a short while in keeping the CPU from being down clocked.

Final Words

Despite having a few set backs in its production of these new products, has come up trumps with both, and have a real golden item in the P/A Reservoir. The Dual Row Rad improves on the Three Row with its similar cooling abilities but in a much more compact design. We still have the same plenum design as before, but the standard of a Black Epoxy Coating to the rad and its removable casing covers many end user eventualities, from those who won't/can't paint the rad to those who have differing mounting ideas. Like before, the Dual Row Rad has 10mm tubing which makes it more compatible with other non-WACC components and you have mounting holes for a 120mm fan on both sides

The P/A Reservoir is a great addition to WACC's lineup, and whilst it retains the 8mm push fittings WACC use on their small bore system, provision has been made for other fitments and these can be changed by simply asking when ordering. The inclusion of blanking plugs of ¼" holes, allows you to alter the flow from end to end to be all in one end if you so wish, and WACC also have a couple of ideas too (watch this space :) ). Multiple sizes from 300mm up to 1 metre, differing colours (blue, silver and black) and of course the different fitments make it quite versatile in its application. I've also seen them for sale with 1/2" fittings for you big bore users. Having no included pump means that not only is the price low, it can be added to any existing system with the right fittings. The two clear end caps add to the aesthetic quality and provide an instant visual indication of the water flowing. The mounting system is simple but effective. It's light, solidly constructed; And bottom line, it works.

Right now my system temperature is at 29C, my Antec P160's front 120mm intake fan is off, the fan for the radiator is off and the P/A Reservoir is doing the majority of the cooling work alone. I'm typing this review in MS Word, Winamp is playing a song from an Internet radio station, mIRC is in another corner and for all intents and purposes the system is pretty much idle, with the odd spike up to 8% CPU usage. During all this, my CPU temperature is holding at 38C in utter silence, no fans. That's pretty damn good to me. I'll probably play a game later, or set the system to do some Folding@Home, at which point I can put the fans to 4v (just enough to get the radiator actively cooling) which will give me the almost silent sound of the air moving and not much else.

I have no doubt that a Prescott would give the P/A Reservoir a run for its money, but if you have a non-overclocked system, then chances are that a P/A Reservoir, pump and block alone will keep your system cool enough and in silence too. If you're overclocking or have a Prescott, you'll want a radiator and fan in the loop for load situations, and this is also recommendation too.

(For the P/A Reservoir)

Right now WACC are selling from their own site, and you can also buy the P/A Reservoir at . American and European orders are a little harder to come by, and WACC are looking for resellers for both areas (feel free to contact WACC if you are a reseller on the continent or in the states and are interested in stocking WACC Products).

update - have agreed to take orders for WACC stuff, so if you are in the US and are interested, click the link and place you're order!

Pros: Dual Row Rad - Black epoxy coating gives a tidy appearance, High density fins, Rifled tubing, Compact design, Price
P/A Reservoir - Great overall looks, Clear end caps for visual water flow indication, 3 colours available, Different lengths, Different fitments, Unique, Great temperatures without the need of a fan, No moving parts and therefore no noise, Price

Cons: UK sales only on all WACC stuff at time of writing, will need an area to mount the P/A Reservoir

Bottom Line: I've seen a few products go through the VL Labs that have stuck in my mind as outstandingly good and memorable. The Antec P160 is one, the MSI K7N2 Delta is another, and now the P/A Reservoir can be added to the list as well. Questions or Comments, hit me up in the Forums.

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