Outright USB bus power deterioration?

2009 MacPro
I'm so confounded and tired from this I'll just state the symptoms in bullet fashion
• Powered Rosewill hub on one of the 3 rear USB ports: each of the 7 hub ports has been going out one after another the last 2 years. I just pull out a cable and move it to the next one.
• Last couple years whimsical random ports not working (just switched to a dif. port)
• With each upgrade (10.8, 10.9) thought it would solve the problem but doesn't
• Yosemite put me over the edge. I can't even keep 2 thumb drives in the ports for data transfer until one unmounts
• Self powered Toshiba USB 3.0 drive oes pretty good on 27" LED display hub-port
• Almost impossible to even boot with a key held down:Option for boot drive, PRAM zap, etc.
• After CCC boot drive cloned to Toshiba for Yosemite prep, would not pick it up after 'Startup Disk' selected as such and restarted. Defaulted to internal normal boot
• Haven't used the Superdrive in years, even replacement drives would almost never work.
• Four 4tb internal 3.5's running over all 4 sleds perfectly on SATA power. Main boot drive/OS is on OWC DDS 256gb Accelsior on the PCIe slot
I don't know how I'm supposed to run a hardware test seeing as the bootable you're supposed to launch from would not appear anyway.
IF I knew grabbing a USB 3.0 PCIe card to pop into the rear would be a cheap workaround I would gladly do it! WOuld that run on a different power supply than the rest of the USB system, IF the current powering these ports is compromised in strength? But why would even powered ports be dropping out, such as the Cinema ports etc.
Help!!
Don't want to run this to the Genius Bar but if these symptoms can trigger a diagnosis from any of the experienced here it would help a lot
THXXX 
ps - maybe it's a simple circuit thing on the board? A module? The power supply internally?  What I do NOT want to hear is motherboard stuff...that would put this at a fix more expensive than the machine is worth!

Just wanted to do a follow up on what I've learned. One tried and true card peeps will stand by on the Mac Rumors threads is the 4-port version of this 7 port I'm going to get:   http://www.inateck.com/inateck-kt7001-7-port-usb-3-0-pci-e-express-card/
I'm doing this one primarily because it requires power and one of the useless Superdrive bays (one is a BluRay reader that functioned correctly for all of a week) can afford me that source. Even though some there said that they have a number of spinners running off the PCIe power, (4 port doesn't require additional juice) I still feel more comfortable attaching one with power. I can add their hubs too, one has an SD reader built right in! I'll mount the powered aluminum MacBook version right under my desk.
The one thing though, I believe with all PCIe based 3.0 cards - when the Mac is put to sleep, the power stops and drives get disconnected. I don't think it's a terrible issue for me, since it will be taking a drive for backup purposes. I don't know if it's a USB 3.0 shortcoming or a PCIe thing. But my main boot is an OWC Accelsior SSD and it's on a PCIe card so I have to think it's more of a USB thing.
All the other weird things with the clean install and upgrade are much smoother now. Only thing that makes me nuts is with every OS upgrade I can see a little more lag in Graphics power when it comes to Spaces switching!  512 is about hitting it. Looking at new ones I'm only seeing 3 or 4GB hitting the $240 range. I'd settle for a 1.5 for $100 but don't think I'll find one of those.
With each boot the whole system is running smoother, Lightroom, entire CS6 suite, you name it.
The 3rd party Lightning cables were spotty at best in sync capabilities for that and iPad. My original is stuck in my car head unit. With Yosemite forget it!
Apple blackballed all cables NOT Apple. I borrowed a buddies and my iPad and iPhone read without any issues. "Trust" this computer and finally have all 3 in harmony.
Finally, the USB drives keep dropping with gb's of transfers. 2 SanDisk Fit's can't transfer to each other.
I've come to the conclusion that the cost of a motherboard and labor to install (IF it's the USB controller) I might as well get an identical 4,1 2009 2.66.
and drop my 16tb of internal plus OWC SSD and 16gb RAM.  And just sell this one for a hundo less with the understanding that the USB is sketchy!
Makes sense right?
I'll play around with the Bluebery iMac key/mouse and nothing else later on, but I doubt it'll make a difference

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