Looks like they use the same fan. I want to replace the VF900 that's currently on my GTS250, since even at 1800rpm it's too loud. Both these coolers start at 1400rpm, which sounds great- at the upper limit of acceptable. Has anyone seen a side-by-side between the two coolers? My concern is that the VF1000 has more heatpipes, but they're farther away from the fan, and may therefore be less effective.