That's the question I've asked myself again and again when I've suspected I could just get that little bit more performance out of my machine..... So, spying a NVIDIA Quadro FX4500 on ebay for a reasonable(ish) price, I decided to find out. My existing card was a NVIDIA Geforce 6600 which is neither bottom of the barrel nor exceptional - just a stock no frills card for a G5 Quad I guess but the Quadro is one of the best cards available for the late G5...so there should be some improvement maybe? These are my findings with some standard tests and not so standard tests I've cobbled together myself: GioFX OpenMark 6600 - 5484 4500 - 15769 Let1kWindowsBloom (http://www.vgg.com/rob/WindowsBloom.html) 6600 - Total time to create and dispose 1000 windows: 5 seconds (5925683 microseconds) 4500 - Total time to create and dispose 1000 windows: 5 seconds (5703893 microseconds) Photoshop Filter Benchmark (http://ksimonian.com/Blog/2010/02/2...for-both-mac-pc-free-radial-blur-filter-test/) 6600 - 74.7 seconds 4500 - 74.6 seconds Playing a 4K(3840 X 2160) h264.mp4 in full screen (http://hwcdn.net/j9t9v3v5/cds/Coastguard_H264.mp4) 6600 - Plays smoothly in VLC, stutters with MPlayer 4500 - Plays smoothly in VLC, stutters with MPlayer Playing a 2K trailer in Flash on Youtube () 6600 - stutters too much to be considered playable 4500 - stutters too much to be considered playable Video encoding benchmark (http://forums.macrumors.com/threads/diy-benchmark.1862039/) 6600 - 01:59 4500 - 03:26 Running multiple 360P h264 videos smoothly with Quicktime, all on screen under Expose 6600 - 5 4500 - 7 All in all, very disappointing. HD video playback is exactly the same and if the benchmark is to be believed (and I ran it 4 times to check), video encoding now takes twice as long! I'd imagine the Quadro will have benefits for gaming judging by the huge leap in the GioFX benchmark and be great for dual monitors - two areas not applicable to myself. Has anyone had noticeable improvements after upgrading their graphics cards - not including moving from non-Core Image cards etc?