Card Spacing and Cooling

The spacing should be 2-3 slots apart on all boards (you can send your thanks to 3DLabs on that one) and the NV Silencer 5 doesn’t take up any more real estate on the card itself from the VPU forward than the stock cooling does (it obviously takes up quite a bit of space behind it due to the large fan), so it should work just fine if the golden fingers are not further more than an inch or so further from the mounting bracket than the VPU is. This does include the EN6800, however unfortunately Asus does not follow standard fan plug design for their graphics cards so to use the NV Silencer 5 you will need to mod it a bit or hook it up directly to the PSU (Arctic cooling has instructions).

You will therefore have to pick your cards carefully for golden finger position. Fortunately, when ATi’s SLI launches ~Q2 it will not use any bridge, it will rely on manufacturers meeting the PCI-E specification for high speed switching between cards. Looks like Via’s up a creek without a paddle … (nVidia’s chipsets are not in that much better shape either, but at least they will support two ATi cards correctly, although Intel chipsets will support three or more in SLI).

Which reminds me to check and see if my FGL Z1-128p will accept the ATi Silencer 1, since this thing is rather loud and gets rather toasty (and requires two slots to begin with so its no loss).
There should be no need for additional slot cooling after putting in an NV Silencer/ATi Silencer. It’s already sucking out all of the hot air, an putting a fan there wn’t change how much air is being drawn. And yes, if you have two slots in between your two GFX cards you’re more than fine, even with only one you should be OK. Remember that 3DLabs uses basically the same cooling system as the NV Silencer/ATi Silencer and their Realizm 800’s are routinely spaced only one slot apart for a pair of them.