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Gtx280('s) in the loop?

Water is always worth it.

Less noise, better overclock, stability......

With a decent rad it would be no problem. I use a PA120.3 and I have yet to see that get warm to the touch.
 
I haven't added my 280 to my loop yet but will do soon. It overclocks extremely well on air but the thought of also eliminating the fan noise makes it worthwhile.
 
I use a DD Tieton, and load is mid 40s after a few hours, sure to drop a bit in winter time.

The problem you might encounter with some 280s is the heat faulty ones cannot be saved by liquid cooling. Well they'll be saved, as they won't run 100c anymore. If lucky you'll bring it down to the 70s, but that's still way wrong.

If you're on the stock cooler at 80% fan and pushing 85c then you got a bad card.

Performance wise, it's not worth it. Any decent 280 will get at least 690 core/1250+mem/1450+shader on air and I doubt artifacting will be due to heat. In the situation where it is due to heat, liquid won't take you that much farther, if lucky 30-50mhz depending on the variable(mem, shader etc.) and that's not going to give you one noticeable bit of performance gains.

And ultimatley cards like the 280 don't even need and OC for real world use, i.e. 3d applications. You'll see less than five frames, usually less than three, by taking a stock 280 to an extreme overclock.
 
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I've got one WC'd 280 and one on stock air until I can get my 2nd block installed. The loop is kind of overkill with one on (PA120.3, DD Tieton) but I'm using one fan on the rad atm and my ambient temps are pretty hot usually.
I've never seen the WC'd card above 60C and get no artifacts, even with a 748 core clock, but when in SLi the air cooled one can get to over 70C pretty quickly and I'll start seeing artifacts when slightly OC'd (717 core, Zotac is 700 standard btw), even crashing more times than not when it hits 76-80C.

As others have said though, OCing these cards doesn't bring a massive gain unless you're pushing them for benches or whatever.
 
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