I've got the iSilence version of this card for my new build, but in the PCI-E x16 slot the heatsink is right up against the Megahalems, so I'm concerned about cooling. If I move it to the x4 slot on my EVGA P55 LE mobo, will the throughput suffer? This machine will be used for audio production and video ripping/encoding. CPU is an i860.