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Noise from PSU after upgrade

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I've just upgraded my mobo, processor and memory.

Old Setup
* Mobo - Asus P5B
* CPU - Core 2 Duo e6300
* Memory - OCZ 800mhz (can't remember exact model)

New Setup
* Mobo - Asus Rampage II Gene
* CPU - i7 930
* Memory - OCZ 2000mhz (Gold Series, currently running at 1066mhz. Issues getting it to boot/register correct amount of ram at higher frequencies)

The rest of my system (unchanged)...

* Antec 1000w Truepower Quattro PSU
* EVGA Nvidia GTX 285
* 3x 250gb HDDs
* 1x DVD Burner

When I fired up "Stalker: Call of Pripyat" earlier, I noticed a constant high pitch whine coming from my PSU while I was in the main menu. Entering other menus causes the pitch to change or lower slowly.

I had the problem before with my old setup when I upgraded my gfx card from an 8800gts to a GTX 285. I swapped out the 800w psu for the one listed above, didn't have a problem again until today.

Surely my PSU should be able to handle this setup. Could it be a faulty unit, or is it just struggling with what I've got in my machine?

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"There are two common noise problems associated with power supplies, noisy fans and whistling capacitors. Noisy fans can be replaced, but only if you're a reasonably competent technician because you can really get a nasty zap from the stored energy in the capacitors even when the power supply is unplugged. Make sure your noisy fan problem isn't due to something silly like a piece of paper poking in through the fan grille before you rush out and buy a replacement. If your dog won't stay in the room when the computer is turned on or if your kids hear a high pitched whistling that you don't, it's probably a capacitor. To determine whether the capacitor is in the power supply or elsewhere in the system will require a process of elimination or some parts swapping."

http://www.fonerbooks.com/power.htm

some more info

I'm running my machine with the PSU outside the case now. Using some high tech equipment (an ear plug in one ear, and a short length of garden hose in the other) I've discovered that the noise has two sources. The majority comes from the PSU, but a quieter identical squeal comes from the graphics card as well.

Could the noise from the graphics card be due to the "dirty" power on the PCI-E rails?
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