6 projectors doesn't work on new MP

In Mac Pro 2013, FirePro D500, 16 Gb DDR3 ECC 1866 version OS 10.9.2
- connecting 5 Epson projectors via cable Mini DisplayPort - Dual-Link DVI
+ external monitor with cable HDMI.
Problem - the video content on the projector is extremely slow. Over time, some projectors do not work, lose their signal, there is an effect of "white noise"
information about the system.
Tab graphics / monitors - all 6 outputs are connected to a single graphics card - Slot1. Slot 2 - empty.
In what could be the problem?

The fine print in this article only guarantees six displays will work if they are ThunderBolt or DisplayPort connected displays:
Mac Pro (Late 2013): Using multiple displays
You can have up to two "legacy" displays (including the built-in HDMI as one of the two if you choose to connect it) and that they will work acceptably well, but there are still occasional reports of them not always coming on reliably.
Readers experience here is that you can have additional "legacy" displays, but they must all use ACTIVE adapters. ACTIVE adapters have additional electronics inside, so that they do not rely on the low-level signals provided directly by the Mini DisplayPort from the computer -- they at least have signal boosters.
There is ONE power lead in the standard interface, and that allows enough power for Single-Link DVI. Displays wider than 1920 wide require Dual-Link DVI, and the electronics is not trivial, so they need a USB for additional power to run the converter. The Apple adapters cost US$100 each, so if you can run your projectors off cheap DisplayPort cables, you should do so.

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6 projectors doesn't work on new MP

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