My new case has helped my GTX 470 overclocking endeavors tremendously.
As of right now I've got it running stable at 788\1575\1900 with 1.062v. In Kombustor it tops out at around 82C, in the Cryostasis benchmark it sat at 84C for a while. The fan is fairly loud because it scales almost 1:1 once the GPU gets over 75C, but its not too bad. Its currently about 68F in my room, so its fairly cool in here.
The performance is through the roof because of this as well.
Check out the increases I recorded from overclocking in the Cryostasis tech demo benchmark:
Cryostasis Tech Demo - 1920x1200 - DX10 - High Preset (Physx on GTS 250 @ 600/1566/800)
GTX 470 @ 600/1215/1674
GTX 470 @ 725/1450/1800 (1.025v)
GTX 470 @ 750/1500/1800 (1.050v)
GTX 470 @ 750/1500/1875 (1.050v)
GTX 470 @ 788/1575/1900 (1.062v)
That's a 23.7% increase in average frame rate from overclocking.
I've never seen GPU overclocking results like this before. I'm very impressed!