It's not that shocking when you think about it. The whole system has to coordinate the rendering of frames for four GPUs, that's quite complex. And their still developing the drivers.
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Main rig:
Intel Core 2 Duo E7200 | MSI P7N Zilent
2x2048Mb OCZ Titanium 800MHz DDR2
Samsung Spinpoint T166 320Gb SATAII
Western Digital Caviar 500Gb SATAII
Samsung Spinpoint F1 750Gb SATAII
MSI NX8800GT OC 512Mb
Creative Sound Blaster X-Fi Xtreme Audio
Antec Truepower Trio 550W
Vista Ultimate 64-bit
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