For the BCU-1525 it appears that there are 4 heatsink options and I have been asked to complete a survey to chose my cooling options.

As a group buy purchaser back in June, I m really confused on the options and what performance benefits we will see.

I ordered the $3600 USD models with RAM and "mods and alterations".

The 4 options are:

1) stock factory BCU Xilinx heatsink
2) SQRL upgraded passive heatsink
3) SQRL upgraded active heatsink
4) SQRL water block

Does my $3600 model include the #2 heatsink?

What will the mining performance variance be for the 4 different options?

Can the active air cooled units mine as quickly as the water cooled units assuming 4 or 8 cards in a standard GPU mining rack with external fan blowing?

Thnx!