Advanced Micro Devices Inc (AMD)

[CombJelly]

"How much power do you think a regular DDR or DDR2 can dissipate?"

According to Micron, max. 4 watts for their 1 gig. DDR1 DIMM.

http://download.micron.com/pdf/datasheets/modules/ddr/DDA16C32_64_128x64AG.pdf

For their 16 chip 1 gig. DDR2 modules, it is about the same

http://download.micron.com/pdf/datasheets/modules/ddr2/HTF16C64_128_256x64HG.pdf

If FBDIMMs require an additional 8 watts, then a fan might not be strictly needed, but some way to insure good air flow is needed. They can't just dissipate to still air.