NEO2-FIS2R ATI 9800 AIW Pro TV Tuner causes freezes/blue screens. Help!

Question

I recently upgraded my system from P4 2.4Ghz to P4 3.4Ghz Northwood and went from All in Wonder Radeon to 9800 AIW Pro. Only other change worth mentioning is I created a 0+1 RAID using 4 hard drives which were previously configured differently. I watch a lot of TV while I work on the computer. I do a lot of disk writes and data management which ultimately creates a lot of transfering of data between disks. Never was a problem in the old config. BTW, I also use an external HD conntected through USB for data transfers as well.
Immediately, my system went from stable to unstable. I first noticed that the destop redraw on bootup was slower. Then I noticed that the TV had a delayed response on changing channels and changing volume. Switching to another window causes a slow redraw and sometimes causes a jerk in the TV display like a hickup. Other symptoms include blue screens but no driver is referenced. The blue screen otherwise is a normal STOP screen except for the bottom quarter of the monitor which looks like video garble. Sometimes it just reboots. Sometimes, it freezes. I noticed that doing disk transfers while watching TV usually speeds up the behavior. Comparatively, my use of the TV in the old config was transparent regarless of how much I taxed the system.
Anyway, in view of the unexpected behavior, I decided to backup and reinstall the OS from scratch using a vanilla install method. Everything was detected properly, OS installed fine. Installed ATI's latest Catalyst drivers. I turn on the TV and within about 15 minutes of use, the erratic behavior begins. I figured it was a bad card so I exchanged it out. Same thing with the new card. ATI is shrugging their shoulders and pointing at MSI.
I ran hardware tests, updated the MB BIOS to latest available. Tested all four hard drives/RAM. I can't find any hardware issues. I'm very conservative with my BIOS settings so aside from the default values, I have only changed the settings required to allow for a 0+1 RAID config on the Promise controller.
I put my old ATI Radeon back in and ran the TV for hours and had no problems at all. I also swapped my old 2.4 back in with the 9800 AIW Pro and the problem is recreated so that is what has me ruling out the processor.
Here's what the box looks like inside.
Antec 480 True Blue
MSI NEO2-FIS2R (w/latest BIOS)
1GB Corsair VS512MB400 x 2
4 Maxtor 160GB hard drives, 8MB Cache, 2ea SATA, 2ea PATA
Intel 3.4Ghz Northwood CPU, 512KB, 800FSB w/Zalman 7700CU HS/F
ATI 9800 AIW Pro 128MB DDR
Front/Rear 120mm Case Fans
Optical drive, floppy drive, modem card, sound card.
NOTE: All USB ports are being used by devices with their own power supply except for a web camera.  All fans are using power from PSU. No fans use MB power.
I also checked to insure that the AGP card was seated correctly and verified that it was. So, I'm pretty bummed out that I just dropped circa $500 on improving my system but I can't even get it work as well as it used to.
I think I have found the problem but short of getting rid of the 9800 AIW Pro, I am hoping that someone else has had this problem and can help me out. Your ideas would be greatly appreciated!!!

Answer 1

Good News!!
While the DDR voltage was set to 2.7, I recreated the conditions in which the failures tended to occur. Within minutes, it was obvious that something had changed as I had never gone that far without getting kicked out, freezing up, or blue screening. Since this is looking more and more like a power issue, I decided to leave all of my external USB connections disconnected except for the external hard drive because I normally transfer data back and forth frequently from it.
When I saw that the system was holding up well, I connected the rest of the USB connections. Everything ran OK for a few minutes but then the sound from the TV dropped out while the picture continued to function. Although, this marked another failure, it was a marked improvement over what had been happening previously.
NovJoe suggested tweaking the voltage to 2.7 ~ 2.8 so I upped the voltage to 2.8 and setup the same environment and the machine has run that way for about 3 hours. That one increment seems to have made a difference.
Questions which come to mind.
1. If this is a power issue, is it the motherboard's inability to supply the correct voltage to the motherboard components or is it a PSU issue which isn't providing the motherboard enough juice to do its job or a combination of both?
2. If this issue can be corrected through tweaking voltages, how do you know how far to go before damaging system components?
One of the original symptoms with the TV is still apparent. Upon changing channels, there is a second delay before the sound and picture synchronize. Changing foreground windows also causes a "hickup" in the TV's sound/video. I'm more concerned with what this behavior may mean from a system performance standpoint rather than the annoyance since this is a 9800 AIW Pro and it should be snappy instead of sluggish.
Up the AGP voltage? On that subject, the people here seem to have a lot of background with tweaking the BIOS. I'd appreciate any other ideas in tweaking this system as well.
Ultimately, I have to answer the question of whether I need to get a bigger PSU or can I safely correct my system performance by using BIOS tweaks?
Thanks again for all your help.