CPU bottleneck by Radeon HD 5xxx series GPU's?

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I've read that the Radeon HD 5000 series graphics cards, especially the HD 5950, and 5970 dual-core ones, are being bottlenecked by even today's fastest available processors. Including the Core i7 975.

A single Radeon HD 5970 (Two HD 5870 cores) has even more throughput than Two Radeon HD 4870's quad crossfireX. Which required a quad-core processor to be a clocked past 4.0 GHz with water cooling to completely remove the bottleneck posed by the Four GPU's.

Is there any way of telling if you have a bottleneck? Is there any program I can run to tell me so? I'd imagine my bottleneck is caused by my HD 4850 running on a PCIe 16x 1.0 slot, instead of a 2.0 slot. I can't buy a new motherboard without having to buy new RAM, and possibly a CPU due to bus speed and chipset compatibility issues.

Is my Core 2 Quad Q9400 2.66GHz running at it's stock 2.66 GHz enough for my single Radeon HD 4850? My BIOS forbids overclocking of any kind.

I don't have the money to do that at the moment.
 

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