Morning
Ambient temps range from 15c on cool mornings, to 25c when 2 PCs have been on all day, as measured by an internal digital room thermometer thingy.
Yesterday evening, room temp was 25c. The Reserator also showed a starting coolant temp of 25, and ambient temp of 25. This never changed at all for 3 hours (no heavy use). Again idle/Civ IV temps, and yes Speedstep is enabled, sat at 28c CPU and 32c GPU.
I will admit I was using the Gigabyte windows software and Catalyst to measure the temps so take the numbers with some salt, and I understand that as the computer is basically doing nothing, the temps should be low. I'l say again though, this Reserator keeps this machine cooler during idle than the older Reserator did to my older A64 based machine.
As mentioned I don't prime, simply because I don't. I honestly don't believe the Reserator series have been designed with performance OC in mind, more for the ability to silently cool a relatively powerful machine. However, in the interests of science i'l give Prime a go. (I will admit, I deliberately chose some components with the idea of having a little go at some OC'ing) I'l have to read the relavent stickies first to get the right testing/measuring software etc.
On the cool'n'quiet side, i'l now say that when there's background noise such as during the day, the system really blends in. Late at night, no traffic, no kids, no TV etc, the noise is more noticeable at the desk, 2-3m from the desk and the noise begins to blend into the background level.
Overall thoughts
For those interested in noise level, it's not as quiet as previous Reserators.. simply because you can't switch of the internal 14cm fan, lowest it seems to run at is about 1000rpm, and whilst the woosh of air is background during the day, it's noticeable during the night.
For those interested in cooling, It keeps an idle Q6600 cool

not much more I can say at this time and tor those interested in performance.. please hold whilst I muck about with Prime and wotnot...
Anyway. Here's complete specs. Reserator XT cools the CPU, GPU and GPU RAM at the moment.
Q6600 G0
GA-P35-DQ6
Crucial Ballistix 5300 (4GB)
Sapphire X1950 Pro
2x WD Raptor 36Gb - Raid (Vista 64 Ultimate)
2x WD 500GB - No RAID
Dell 2407WFP-HC
Lian Li Medium Tower, not sure the name, 3years old.