I had to swap the connector, but this fan runs almost completely silently and and is working great in my Bolt. https://www.amazon.com/gp/product/B00006HOMA
Interestingly that fan does not seem to show up on the UK Amazon site. Originally I had a noisy fan on my Bolt, but when I raised a ticket on this I got sent a replacement that runs silently. It seems quite a few of the original Kickstarter Bolt’s had an incorrect fan installed that was much noisier than the one that was intended to be installed.
I ordered my Bolt from Digikey, I wonder if my fan was louder than it was supposed to be, but I don't think it was outside its specs.
