Netstor's TurboBox NA255A is intended for multi-GPU workstations able to leverage the compute power of graphics hardware. So, we start our evaluation using LuxMark.

As you can see, there is no difference in performance between a motherboard operating a PCI Express 2.0 signaling, a motherboard at PCI Express 3.0, and the TurboBox. This workload fully utilizes each graphics card's compute resources, but it doesn't tax PCI Express bandwidth. Consequently, scaling is pretty much amazing.

Again, we see nearly identical results between the motherboard-based cards and Netstor's TurboBox. This means that we don't have any trouble going outside of the box or stepping down to PCI Express 2.0, at least in compute-bound workloads.
On a related note, we ran the same bitcoin mining test on a Socket FM1 motherboard using a PCI Express slot limited to four lanes of connectivity. The result was identical to our 16-lane tests, around 550 Mhash/second. In other words, we're not worried about one third-gen PCIe x16 slot serving up enough throughput for a fourth card in Netstor's NA255A TurboBox. We hypothesize that there's still headroom available.
- 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Or you could use the $2000 to ditch your mac pro that is years out of date and use the money to buy a pc that is better in pretty much every way.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Or you could use the $2000 to ditch your mac pro that is years out of date and use the money to buy a pc that is better in pretty much every way.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