Power problems with Radeon 3870 on 2008 Mac Pro

I've got a 2008 Mac Pro (10.5.7) and I've replaced the 2600 card that came in it with two Radeon HD 3870s and I am having an issue.
The cards are in slots 1&2 (the higher speed slots.) After a short period of time, the card in slot 1 powers off its monitors, but the monitors on the second card remain active. Only a reboot reactivates the monitors on the first card.
In the process of debugging this I've removed all cards and put 1 3870 in slot 1. The problem remained.
I swapped in the other card in slot 1. The problem remained.
I then tried each card in slot 2. The problem remained.
I've reinstalled the 10.5.7 updater, but this didn't help either.
Here's what the card looks like in system profiler:
ATI Radeon HD 3870:
Chipset Model: ATI Radeon HD 3870
Type: Display
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: ATI (0x1002)
Device ID: 0x9501
Revision ID: 0x0000
ROM Revision: 113-B3390F-270
EFI Driver Version: 01.00.270
Displays:
VX2433wm:
Resolution: 1920 x 1080 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
VX2433wm:
Resolution: 1920 x 1080 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Here is what the pci info on it looks like:
ATI Radeon HD 3870:
Name: ATY,MegalodonParent
Type: ATY,MegalodonParent
Driver Installed: No
Bus: PCI
Slot: Slot-1
Vendor ID: 0x1002
Device ID: 0xaa18
Subsystem Vendor ID: 0x174b
Subsystem ID: 0xaa18
Revision ID: 0x0000
Link Width: x16
Link Speed: 5.0 GT/s
and
ATI Radeon HD 3870:
Name: ATY,Megalodon
Type: display
Driver Installed: Yes
Bus: PCI
Slot: Slot-1
Vendor ID: 0x1002
Device ID: 0x9501
Subsystem Vendor ID: 0x174b
Subsystem ID: 0xe620
Revision ID: 0x0000
Link Width: x16
Link Speed: 5.0 GT/s
Any advice would be appreciated

Now enough free space on the disk can slow the entire system down.
Click your Apple menu icon top left in your screen. From the drop down menu click About This Mac > More Info then select Storage from the menu.
Make sure there's at least 15% available space.

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M

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go to a black screen after 15 minutes or a couple hours
That is probably an indication that you need to find a new graphics card.
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1) Apple brand cards,
2) "sold in the Apple store" cards, and
3) "Mac Edition" cards ...
... show all the screens, including Boot up screens, Safe Mode, Installer, Recovery, debug screens, and Alt/Option boot screens. At this writing, these choices include:
1) Apple brand cards:
• Apple-firmware 5770, about US$250** works near full speed in every model Mac Pro, Drivers in 10.6.5
• Apple-firmware 5870, about US$450
2) "sold in the Apple store" cards
• NVIDIA Quadro 4000, about US$1200
• NVIDIA Quadro 5000, about US$2500
3) "Mac Edition" cards -- REQUIRE 10.8.3 or later:
• SAPPHIRE HD 7950 3GB GDDR5 MAC Edition, about US$480** Vendor recommends Mac Pro 4,1
• EVGA GTX 680 Mac Edition, about US$600
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• running 10.8.3 or later AND
• don't care about "no boot screens" etc AND
• can re-wire or otherwise "work out" the power cabling, THEN:
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I recommend you install nothing older than the Apple-firware 5770, about US$250.
RE: Mac Pro Replacement Graphics cards
1) Apple brand cards,
2) "sold in the Apple store" cards, and
3) "Mac Edition" cards ...
... show all the screens, including Boot up screens, Safe Mode, Installer, Recovery, debug screens, and Alt/Option boot screens. At this writing, these choices include:
1) Apple brand cards:
• Apple-firmware 5770, about US$250** works near full speed in every model Mac Pro, Drivers in 10.6.5
• Apple-firmware 5870, about US$450
2) "sold in the Apple store" cards
• NVIDIA Quadro 4000, about US$1200
• NVIDIA Quadro 5000, about US$2500
3) "Mac Edition" cards -- REQUIRE 10.8.3 or later:
• SAPPHIRE HD 7950 3GB GDDR5 MAC Edition, about US$480** Vendor recommends Mac Pro 4,1
• EVGA GTX 680 Mac Edition, about US$600
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If you are Meet ALL of these:
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• don't care about "no boot screens" etc AND
• can re-wire or otherwise "work out" the power cabling, THEN:
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These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
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from the log list on the left. If you don't see that list, select
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from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

Power problems with Radeon 3870 on 2008 Mac Pro

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