Using twoo NVIDIA 7300 cards: firmware bug? Screen refresh problem

strange bug with Mac Pro 2.66 Xeon:
I have two Displays, 20 and 23".
When both connected to the standard NVIDIA card in the Mac Pro, evreything is fine.
I ordered a second NVIDIA card wich I installed in slot 4, using 8 lanes for this card.
Now, when one display is connected to the standard card and the second display is connected to the second NVIDIA card, the screen of the display connected to the build in card (the 16 lanes card) does noet refresh correctly. You can not see what iMovie is displaying for example, iMovie screen is white and does not display what should be on screen.
Sometimes none of the main screen is refresehd (example: Safari content is not updated, while in fact it is!) but the mousecursor moves correctlyon screen.
Also third party software (like FotoMagico) is not updated on screen
Connecting both displays to one card and everything is fine!
A strange bug wich I guess is related to the Mac Pro firmware
I've tried the second NVIDIA card in all the PCI-E slots to see if this makes a difference, it does not.
I used the PCI-E configure tool to vhange the speed of the lanes for the PCI-E slots, also this makes no diffrence.
At this moment my second card is not usable.
This is a problem on all three Mac Pro's we tried this on (2.66 version, 2 machines with 1Gb RAM, 1 machine with 3Gb RAM), latest OS 10.4.7
Starting in safe mode makes no difference on either Mac Pro

I am running two 7300 GTs in my 2.66 GHz Mac Pro driving (2) 20" + (1) 30" Cinema Display. I am not seeing the issue you mention in iMovie. Quicktime flickers every once in a while when playing iTunes video content, but that started with the iTunes / Quicktime upgrade, not when I added the extra card.
I have my nVidia 7300 cards in slots 1 &2 each running 8 lanes. Might be worth a try. The 7300 is not that "high performance" that running in 8 lanes is going to make a huge difference in speed. What it will do for you is get the cards on an equal footing.

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Where to buy the card.
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3) Use static safeguards, like an anti-static wrist strap.
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6) Unplug the machine and place it on it's back on a large white sheet of paper.
7) Remove RAM door, #2 Phillips x 2.
8) Remove RAM.
9) Remove 4 T-8s along bottom.
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13) Remove LCD screws, T-8 x 8. You'll probably drop a few, they're pretty easy to retrieve.
14) Remove two retaining screws on right hand LCD cable. T-6 x2 Unplug cable.
15) Remove LCD inverter cable, left.
Start unplugging everything connected to the logic board.
16) Unplug cable coming from right speaker. Note cable routing, it is the only one that's a little tricky. Also, note that the left one plugs in on the right and the right one plugs in on the left.
17) Remove right speaker. T-10 Note: left and right speaker screws are different lengths.
18) Unplug ODD blower cable.
19) Unplug ODD temp cable and lift up tape.
20) Unplug HDD blower cable.
21) Unplug the HDD temp cable.
22) Unplug the camera & mic cable.
23) Unscrew the clamp securing the airport card (has two antenna cables going to it, labeled PCIE), T-6 x 2
24) Unplug SATA cable.
25) Unplug Power cable, thick black plastic harness, socket.
26) Unplug ambient temp cable.
27) Unscrew the bluetooth card, T-6 x2.
28) Unplug CPU blower cable.
29) Unplug power button cable, 2 conductor, tiny cable, bottom left.
30) Unscrew left speaker, T-10, unplug from logic board, but just leave dangling, no need to remove cable completely.
31) Remove logic board screws. Be careful to segregate them, they have different lengths and different thread pitches and thread types. Some are machine threads going into metal, some are coarse threads going into plastic.
31a) Heat sink frame to case T-8 x 2
31b) Logic board to case T-8 x 3
31c) Screws at heat sink from arrows T-8 x 3
31d) Logic board at bottom near RAM slot T-8 x 2
32) Unplug ODD ribbon cable, be extremely careful. Release plastic tabs on each side to remove. Be sure it is fully and evenly seated when you put it back later.
33) Remove logic board with attached graphics card.
34) Unplug graphics card heat sink sensor cable at logic board end.
35) Remove graphics card screws 2 x T-6
36) Remove single screw from small L-bracket on heat sink 1 x T-6
Replace graphics card.
Reverse steps, put everything back together. Be careful not to pinch any cables when you put the logic board back in. When you put the LCD back in, if you can't get the screws to stick to the driver, use some glue stick from your kid's art supplies.
Test everything. You've disconnected every cable in the system.
I torture tested the machine with a space heater on it, 5 different videos of different formats playing at the same time. No problems.
I took a lot of pictures inside the machine. As soon as I figure out a good place to post them, I'll try to add a link here.
Good luck

Greetings!
I know this is in response to your post from over 2 years ago, but I was searching on Apple's site for the max RAM I can upgrade our refurbed iMac too and it brought up this post.
Oddly enough, I've been experiencing the same screen issues and locking up on our iMac as well. I was concerned it was a bad memory module, but now I'm thinking it's the same issue you found.
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Using twoo NVIDIA 7300 cards: firmware bug? Screen refresh problem

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