Tried a couple of TIM's yesterday and today on GTX580 Lightning without IHS:

- Gelid GC-Extreme: 3DMark2011 @ 1425MHz with 1.47v @ -120
- Homight taiwanese silver paste (from Andre): 3DMark2011 @ 1370MHz with 1.47v @ -190

Will try OCZ Freeze because it was excelent on the R6970 Lightning, the contact was so good that the pot barely could handle the heat!