How low can you go?

[masaville]

So I hooked up my hack of a system just to see what two rads would do for temps. I split two 8800 GTXs onto a GTX 480 and an E6700 onto a 120.3.

Fans used were 4 Silenx Pros at 1400rpm and 3 Aerocools
Xtremes running at about 1800rpm, plus the onboard NB fan. Fluid was a 90/10 mix of distilled water and G11.

Ambient temps of 21c.

Record temps are max idle and load, although they don't reflect the average temps.

GTX 480 loop only
------------------
Max Idle temps
cpu1-36 cpu2-34 gpu1-47 gpu2-43 mb-35

Max load temps in 3dmark06 default test
-Sorry, no data available for 480 rad with G11

Max load temps in Vanguard
cpu1-42-cpu2-41 gpu1-59 gpu2-52 mb-39

Split loop - GTX 480 for GPUs and 120.3 for CPU
-------------------------
Max idle temps
cpu1-30 cpu2-30 gpu1-43 gpu2-39 mb-33

Max load temps in 3dmark06 default test
cpu1-34 cpu2-33 gpu1-49 gpu2-43 mb 34

Max load temps in Vanguard
cpu1-31 cpu2-31 gpu1-52 gpu2-45 mb-35

I think those are some pretty kick ass temperature readings, particularly under load. With these two rads I should be able to turn fans down quite a bit and maintain at least the old temps on a single rad with little minimal fan noise. Anyway, in case anyone was thinking of doing the same that's what you can expect.

[Spawne32]

I dunno if i missed it but are you overclocking at all? You might do better trashing those silenX fans...

[masaville]

I dunno if i missed it but are you overclocking at all? You might do better trashing those silenX fans...

No overclock at this point.

[hopper]

cpu 24-30c gpu 37-42ish c not overclocking yet

record temps for me 18c on the cpu but it was really really cold in my room

[Marci]

Total heatload will increase SIGNIFICANTLY when you overclock things... don't expect those temps to stay that sane for long.

[Cronos]

You should provide more details on rad placement and what pumps do you use.

Surely 10C drop is way to much. You can get the 2-4C drop in coolant temperature and maybe 1C from increased water flow (though unlikely) for CPU.
10C? Does not make sense for me.

Quick estimation: 7C drop for GPU is almost totally attributed to 7C drop in coolant temp (as D-Tek has low enough resistance to significantly change the flow).
7C frop in coolant ~7C drop in radiator temp ~7C drop in air out.
Provided that total airflow through GTX480 is no less than 100cfm, This will give ~500W drop in total thermal dump in the loop, and thats only from 1CPU?

[masaville]

You should provide more details on rad placement and what pumps do you use.

Surely 10C drop is way to much. You can get the 2-4C drop in coolant temperature and maybe 1C from increased water flow (though unlikely) for CPU.
10C? Does not make sense for me.

Quick estimation: 7C drop for GPU is almost totally attributed to 7C drop in coolant temp (as D-Tek has low enough resistance to significantly change the flow).
7C frop in coolant ~7C drop in radiator temp ~7C drop in air out.
Provided that total airflow through GTX480 is no less than 100cfm, This will give ~500W drop in total thermal dump in the loop, and thats only from 1CPU?

Make sense or not, those are the results I got. I'll post some photos tonight so you can see the loops yourself. Temps were reported using Everest in all cases. Fluid was the same in both loops, from a pre-mixed 90/10 ration of G11/distilled. The loops are actually a bit long at this point as they were just thrown together for a test to see what impact two loops would have on temps. Fan speeds were listed up top. As for the rad positioning, one at the bottom of a TJ07 on it's side, the other sitting on the top. Sides of the case were off in all tests as well. I used the XSPC 250mm res on the 480 loop and a Swiftech Micro res on the 120.3 loop.