Thats right.

Pre-2008 Mac Pro Owners can now get 8800GT for their machines...

http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wa/RSLID?s=topSellers&fnode=home/shop_mac/mac_accessories/displays&nplm=MB560Z/A&mco=OTkzNDY

I just ordered one... I think they have just added this too.

Stickying this.

PS: mission accomplished.

My understanding from all parties involved is that Leopard is required.

While Apple has shipped one machine with NV G8x class graphics using Tiger - the first MacBookPro's that had an NV8600 chip - that's a somewhat specialized version of Tiger which is not installed on the tower systems - a bit of a one-off.

Worst thing that will happen is that it will just boot up to a blank screen if there is no matching driver on your Tiger system.

"maxed" settings may not get the best results. I would start with default settings and then experiment. Leave full screen glow and multisampling disabled for starters.

We have some tweaks in 2.4.2 that may also bring up performance a bit.

But just to be sure, would you please post

a) which video port your display is attached to on the back of the card(try 1 instead of 2 and viceversa )

b) OS version

c) did you attach the internal aux power cable

d) which slot is the card in.

Can you clarify if you tried it at default settings yet, and also where it is that you are measuring the FPS number.

I remember this one time I was getting 200 FPS, and then the next day I was only getting 40. Then I remembered that I wasn't even in the same place each time.

Moral of the story: useful FPS reports are taken consistently at the same location, or at least include some description of location and facing.