GPU-Z 0.5.3 gives me good vreg temp readings.
All right. Installed a full size 12cm fan - some Asus sleeve bearing 1200rpm fan, says the air flow is 60cfm. It's a little noisy, though nowhere near as bad as the stock cooler. The topmost sata connector on my GA-p35-ds3 is now blocked, or at least difficult to use without some cable bending. (if it was a ga-p35-ds3r, there would be 1 blocked Sata ports)
Idle temps were 33c on boot, 42c after a long stresstest.
Still using OpenCL hash bruteforcers that max the card more than games but less than Furmark:
- Load temps, with shaders unlocked, powertune +10% and 840mhz (max overclock from CCC): ~78c gpu, ~82c VRM.
- Load temps, with MSI Afterburner set to 900mhz and 1,2v: ~90c gpu, but VRMs reach as much as ~106c.
I am not yet convinced that this was a good buy.
I was doing a third test with the Thermaltake TT-1225 A1225L12S fan that I'm using for intake - Thermaltake gets a lot of shit for their noisy fans, but I found these to be noiseless at 5v and 7v, I have 2 as intake and I had a third on my old 5850 + Accelero S1 that I sold. Since I moved one to the cooler, I now have no intake fan in the machine (antec p183, upper chamber. lower chamber still has one intake fan pointed on the hdds).
- at 7v, at 900mhz 1,2v, the machine crashed as I wrote this edit on the first time. Stock speed was some 70-80c for the gpu, as I recall.
- at 12v, which gives a little whoosh sound, at same clock/voltage, I got 92c gpu and 110c vrm. Not good.
- with card set to the marginally lower 880mhz 1,175v (same speeds as the 6970), 87c gpu and 100c vrm. This is... bearable.
I guess there's just no helping it - the Setsugen 2 is NOT fit to cool the 6950 at complete silence, not by itself and not with alternate coolers either. Of course, it was never advertised as 6950 compatible to begin with. I wonder what the temperatures would be with a Nexus or some other more tried-and-true fan that I have no access to at the moment, they'd probably only shave down 5c or so, unless its some high rpm fan which is also very noisy.
Also, remember that I'm running the card overclocked, with unlocked shaders. That puts a ton of extra work into the gpu. With unlocked shaders and stock clocks, the Setsugen 2 stock oughta be enough, and with an alternate 12c fan, it can even do temperatures far lower than the stock cooler... at much lower noise level. Not to mention if you use a PWM fan, and if you NOT run the card 24/7 on max load.
The bottom line is, the 6950 is a giant of a GPU that's pushing the limits of the 45nm process already. It runs hot, like the 4xxx series did so before it. The upcoming 7xxx series on 28nm will have a much, much, much better chance at giving low temps with no noise, just like the 58xx cards did before.
I have a feeling that an Accelero S1 may cool the card as good as the Setsugen 2, at the expense of space. For that reason, I'm not happy with this Setsugen 2 at all.
Now, my only remaining concern, is that I had the backplate attached to the card. This thing gets VERY hot after running the card! I can't imagine it spreading much of the heat, but I'm a little worried that it heats up other components on the card that would be cooled fine otherwise, or would require no cooling by themselves. Should I remove it?