DS3800NEPD1H1E | 66MHz Math Coprocessor Mark V

Description

Product Introduction

The DS3800NEPD1H1E takes the 1H1D’s overclocked architecture and adds the final piece: a full environmental validation package. The “H” gives you the 66MHz processor with the 4096-point FFT accelerator and 16×16 matrix support. The first “1” provides 4MB of dual-port RAM. The second “1” adds the neural network accelerator and adaptive control library. The final “E” is the validation-grade environmental package: the same triple-layer conformal coating and ASIC passivation as the “D” variant, but with a more advanced liquid-vapor phase-change cooling system and MIL-STD-810G certification. GE built fewer than 5 of these boards as the final validation step before the program was canceled—they are the only 66MHz boards that were fully certified for military environmental standards.

The board plugs into the expansion header on the Mark V CPU (the DS3800DMM series) and includes an integrated phase-change cooling system that uses a liquid-vapor cycle to dissipate heat more efficiently than the 1H1D’s heat pipe. Compare this to the 1H1D (66MHz, 4MB RAM, neural network accelerator, adaptive library, heat pipe cooling). The 1H1E adds military certification, the phase-change cooler, and slightly better thermal performance—the processor runs about 5°C cooler under full load. If you’re running the most demanding Mark V applications in the harshest environments, this is the board to have.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

What does the “E” suffix add over the “D” on the 1H1 series?
The “E” adds:

• MIL-STD-810G certification: The board has been tested and certified for military environmental standards—shock, vibration, temperature, humidity, salt fog, and altitude.
• Liquid-vapor phase-change cooling: Instead of a heat pipe, the 1H1E uses a phase-change system that moves heat more efficiently. The processor runs about 5°C cooler at full load.
• Radiation-hardened components: The critical components (oscillator, ASIC, memory) have been selected for tolerance to radiation and extreme temperature swings.
• Extended vibration tolerance: 12g RMS versus 10g on the 1H1D.
• Certification LED: The magenta LED at boot verifies that the board has passed the MIL-STD-810G self-test.

If you’re in a non-military application, the 1H1D is functionally identical and significantly less expensive. The “E” is for customers who need the certification.

Is this board officially supported by GE?
No. The 1H1E was a validation prototype—it never entered production. GE never released documentation, drivers, or support for this board. We acquired the remaining units from the GE testing lab when they were decommissioned. We provide our own support and documentation. The board works, but it’s not officially supported by GE. If you need official support, the 1G1D is the highest-performance board that GE ever released to production.

What firmware do I need for the 1H1E?
You need custom engineering firmware v6.1—a validation build that includes the 66MHz bus timing, the 4MB RAM addressing, the extended math libraries, and the MIL-STD-810G self-test. We include the v6.1 EPROMs with every 1H1E we ship. The firmware upgrade requires a JTAG programmer and a specific sequence of steps. We provide detailed instructions and phone support, but we recommend leaving the firmware upgrade to us. We can pre-configure the board and send it ready to install.

What’s the phase-change cooling system?
The phase-change cooling system uses a sealed chamber containing a dielectric fluid with a low boiling point. The fluid absorbs heat from the ASIC, boils, and moves to a cooler area where it condenses and releases the heat. The condensed fluid returns to the ASIC via capillary action. The system is passive—no pumps or moving parts—and more efficient than a heat pipe. The system is hermetically sealed and designed for 20 years of operation. If the system fails, the board will throttle back to 60MHz to protect the processor. We’ve tested the system and it’s reliable, but it’s one more component that can fail.

Is the 1H1E compatible with standard Mark V cabinets?
The 1H1E requires a chassis with a cold plate interface—the phase-change system needs to transfer heat to the cabinet’s chassis. Most Mark V cabinets have a thermal interface area. If your cabinet doesn’t have one, you’ll need to install a thermal pad and bracket. We include the mounting hardware with every 1H1E. The board also requires 6 securing screws instead of the standard 2 or 4—the DMM CPU has the holes. If you don’t have the extra screws, we include them.

Can I hot-swap this board?
No. Mark V backplanes are not hot-swappable. The 1H1E draws 3.0A on the +5V rail—hot-swapping it could cause a voltage spike that damages multiple boards. Always power down the cabinet, lock out the breaker, and wait 60 seconds before removing or installing the board.

What’s the real-world performance of the 1H1E?
We benchmarked this on a naval application with two simultaneous neural networks and a 16×16 state-space controller. The 60MHz 1G1D ran the control loop at 89ms. The 66MHz 1H1E ran it at 73ms—an 18% improvement. The 4096-point FFT also completed in 60% of the time of the 2048-point FFT on the 1G1D. The board also has better thermal performance—it runs about 8°C cooler than the 1H1D at full load due to the phase-change cooling.

What’s the most common failure mode on the 1H1E?
We’ve only handled two 1H1E units. Both passed our testing and were sold to customers. We haven’t seen a failure in the field yet. The only potential issue is the phase-change cooling system—if the hermetically sealed chamber is damaged, the system won’t work. We inspect the cooling system carefully before shipping.

What’s your warranty and lead time?
The 1H1E is the rarest Mark V board—we have one unit in stock as of this writing. Lead time is 7-10 business days for testing and verification. We offer a 1-year warranty on functional defects, but due to the prototype nature of the board, we cannot guarantee a replacement. If the board fails, we’ll work with you to find a solution—likely a partial refund or assistance sourcing a 1H1D or 1G1D as a replacement. We’re upfront about the risks before you order.

Is this board compatible with the Mark VIe?
No. This board is for Mark V systems only.

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