Normally it is indeed just a loss of couple frames but it is proven that fsx is one the game where the difference can be as big as 15% or bigger cause fsx is using almost the full bandwith, especially on a gfx like a 560, 570, 580.
The circuit board of the graphics card is not touching the heatsink but the fans which are more wide. Can the heat of the gfx melt the fan? Or can it be solft by putting electrical tape between it?
Quote: These results confirm what we already saw on the ATI Radeon HD3850 card: Flight Simulator X heavily depends on PCI Express bandwidth. Reducing the x16 PCI Express 2.0 links to slower ones noticeably bottlenecks the simulator, as access to textures stored in the system main memory becomes far too slow.
Ive also read it on other forums and they are also saying that the difference is bigger with the a high end card a 560, 570 for instance than with a gtx 275, 285.