If you look at this Zalman cooler you linked, the 8800 graphics cards aren't included in the compatibility list. there are very few coolers out there currently that are made to work with these cards.
ThermalRight HR-03-Plus for 8800-nVidia-series VGA
What I find to be lucky about this, is that, first, ThermalRight is the only manufacturer, or only one of a very few, that has an 8800-compatible cooler. Now you'd think that with a near-monopoly short-run position in this market, they'd really boost the price of the cooler -- but they didn't. Figure the manufacturing cost to make the HR-03 series is about equal to what it costs to make an Ultra-120-Extreme CPU cooler, or an Ultima-90, or whatever models they still make. So the price is in line with those other ThermalRight coolers.
Second, you'd figure that with few competitors on the 8800 VGA card-coolers at the moment -- in the "short-run" -- you wouldn't expect the cooler to perform to stellar limits. All they'd have to do is make a cooler that just improves a little on the stock cooler, or enough to make people decide that $50 is worth 10C or 15C drop in load VGA temperatures.
But I'm rather stunned at the performance on this item. Let me explain.
You can go to Cases & Cooling and find my epic thread on motherboard ducting. You don't have to, since I'll briefly explain here, but I'm telling you where it is if you think you want to look at it.
There are two orientations for this HR-03-Plus cooler -- both equally effective. It's explained in their instructions published on the ThermalRight web-site. You can mate up one side of the heatsink base with the GPU so that the heatpipes go up and over the VGA card with the "cool" ends and fins between the VGA card and the CPU (and its cooler), or you can use the other side of the heatsink base so that the pipes and fins hang over "PCI-slot real-estate" below the component-side of the graphics card. There might be reasons why you would want to use this second orientation: for instance, some motherboards like mine have on-board sound with the "sound-riser" card that fits between the VGA and CPU. It just barely interferes with the HR-03-Plus, so initially, I had the pipes and fins hanging over a PCI-E slot I really wanted to use for a RAID5 controller card.
But if you're going to have two graphics cards in SLI, you'll want the fins and pipes between the VGA and CPU for the primary graphics card, and you'll fit a second graphics card (and supposedly another HR-03-Plus cooler) any way that allows you to use available PCI or PCI-E slots the way you want to. This still means that with the second graphics card, you may lose the use of this PCI slot or that PCI slot -- a good argument for water-cooling the graphics cards.
So I had the fins sitting between the VGA and CPU, as I said. TR says "use a fan with the HR-03-Plus" as a cautionary note. I wanted also to "duct" my motherboard, to drastically cool the chipsets and mosfets with air, and part of the idea was to duct the CPU cooler (Ultra-120-Extreme), even though that part of the equation is marginal because it is a very effective cooler. So how am I going to get a fan between the ducted CPU cooler and the VGA card? Only by flipping the CPU cooler around into a less effective position, but ducting the CPU cooler still gave me fairly good performance, and I had a 92mm fan on the graphics cooler.
That's how I got the VGA to stay at 42C while gaming like crazy. Keep in mind that a small duct-box was built into my ducts to channel air away from the HR-03-Plus and down onto the motherboard, where it was sucked away through the motherboard duct to the exhaust fan. This increased in every way the airflow around the cooler -- beyond what you'd get without any ducting.
Even so, I didn't like the orientation of the Ultra-120-Extreme, and wanted to flip it back around. So I expunged my 92mm fan from the VGA cooler, and built a duct extension that forced air through narrow passages up and over the VGA card and past the HR-03-Plus fins. Here, the idle temperature on the graphics card went back up to around 51C, but gaming and loading up the GPU didn't result in any increase, and I have the log-files for GPU temperatures that show it.
ThermalRight should probably pay me for inadvertently promoting their product. But I'm just reporting objective fact here.