Peeling the lid on Ivy 3770K is certainly worth the effort to reduce core temps provided you have the right equipment, I have done a few myself and with an older EK supreme HF CU block in Nickle dropped the average temp at least 6-10c if not more once set correct. The thermal glue job Intel did really sucks and needs to be replaced. I managed a get a few chips after binning that could do mid 50s multi without issue. I use Thermochill PA120.3 rads with Swiftech MCP655 vari speed pumps in current systems.