Jsi Hardware has a Thermaltake Volcano Heatsink Roundup for your viewing pleasure. It features the Volcano 5, 6Cu, and 6Cu+. here's a snip:
"The Volcano 6 series comes in two forms the Volcano 6Cu A1139 and the Volcano 6Cu+ A1138 the difference is that the 6Cu comes with a 4550 rpm fan and the Volcano 6Cu+ comes with a 7000 rpm fan."
Further Reading: Read and find more Roundups news at our Roundups news index page.