The following chart is a little difficult to follow, so I'll break it down like this: the blue bar represents our PC on its own, the red bar is the TurboBox on its own, and the black bar is our PC plus the TurboBox attached.
Naturally, in half of the configurations, there's a missing red bar. This is because the TurboBox isn't being used when we plug our graphics cards into ASRock's X79-based motherboard. In the other half of the charts, the PC bar is incredibly short. That is the result of applying a heavy bitcoin mining load to graphics cards in the TurboBox, which doesn't affect the PC all that much.

As you can see, the TurboBox/PC combo uses about 100 to 150 W more than the PC alone. There's some overhead to accommodate the extra hardware, which we'd expect.

Although using the TurboBox increases power consumption, the cards themselves run cooler as a result of the NA255A's optimized airflow. Moreover, the PC's other components don't end up being subjected to additional heat from a multi-GPU configuration on the motherboard.
- Netstor TurboBox NA255A: Space For Up To Four GPUs, Externally
- Setup And Overcoming Issues
- Test System And Benchmarks
- Results: General-Purpose GPU
- Results: Medal Of Honor Warfighter
- Results: Crysis 2
- Results: DiRT Showdown
- Results: Metro 2033
- Power And Heat
- Our Benchmarks Prove Its Efficacy, But At What Cost?
Or you could use the $2000 to ditch your mac pro that is years out of date and use the money to buy a pc that is better in pretty much every way.
There are some external GPU cases.
The only issue is that the cheapest is somewhere slightly less than $400.
Please explain to me how an aluminum box, a micro-PSU, and a Thunderbolt-to-PCIE adapter adds up to even $200...
$400-$500 for a slightly longer box with a slightly more capable PSU.
Or you could use the $2000 to ditch your mac pro that is years out of date and use the money to buy a pc that is better in pretty much every way.
Mac/Apple users either don't care about or don't under price/performance . My guess, they won't care about the price, just that it doesn't come in pretty colors.
What additional conclusions could be drawn concerning internal vs external throughput?
Apple users are a select group of users, alot of high school kids and girls use them. Not trying to be funny just an observation. If you buy into the Apple thing you have to do things their way and on their terms. Apple has always been cost prohibitive and too restrictive for me personally.
My sister's thoughts when buying a 13" Macbook:
"If it's light, not battery draining, durable, and works, then it's good enough."
ViDock 4 Plus Overdrive (Two 6-Pin/320W/329mm) $279US Plus $30US Worldwide Shipping
http://www.villageinstruments.com/tiki-index.php?page=ViDock
Unboxing: https://www.youtube.com/watch?v=ymYbE3JawLk
7990 x 2?
Still have one PCI slot open for my phone modem card
$13,800? Check your math- I think you forgot a few titans.
4x NA255A @ $2200 = $8800
16x Titan @ $1000 = $16000
4x Seasonic 1000 @ $230 = $920
Total of $25,720 before adding the custom water loops.
the PLX chips are being used in motherboards long ago , and the whole motherboard with PLX chip is 300$ only .. as a matter of fact the PLX chip is 50$ only
add 50$ for case and power and 50$ for board and cables and 50$ profit
what 2200$ ?
I hope Asrock or Asus make such boxs soon for 200$ and with SLI option as well. ...
who needs a stupid useless Thunderbolt when u can have native external PCIe 16 ?
next stop add that port to a notebook .. one to one PCI 16 x no PLX chip... and notebooks will be desktops