Platforms based on the Intel® Pentium® 4
processor in the 478-pin package do not require a modified chassis (e.g., with additional
mounting holes). Chassis for platforms based on the Intel® Pentium® 4 processor must
have an ATX12V power supply and improved
ventilation. We encourage integrators using ATX form-factor boards (D850EMV2) to
choose a chassis that complies with the ATX 2.01 (or later) specification.
Integrators using microATX form-factor boards (D850EMD2) should choose a chassis
that complies with the microATX 1.0 (or later) specification. It is recommended
to use a chassis on the tested chassis list to ensure compatibility with this
platform and proper chassis airflow.
The D850EMD2 and D850EMV2 boards require
an ATX12V compliant power supply that differs
from previous ATX power supplies. The ATX12V power supply provides an additional 12V
processor current via a 2x2 pin connector that is required for proper operation.
Both desktop boards have two ATX12V compliant power supply connectors.
The power management functions of the boards require a power supply with a minimum
+5V standby current (+5Vsb) of 800mA. Intel highly recommends that you use a power
supply with 1.5 to 2.0 A on the +5Vsb line. As more standby capable components
are added to the platform, more standby current is needed to support these components.
The boards were designed to support the
Pentium 4 processor in
the 478-pin package. Table 1 below lists the current processor
support for the D850EMD2 and D850EMV2 boards.
| Processor Family | Processor Speed | System Bus Frequency | Cache Size | BIOS Version | Notes |
| Intel® Pentium® 4 | 3.06 GHz | 533 MHz | 512 KB | P21 or greater | The following board revisions (AA numbers) support these processors: C18369-603 or later |
| 2.8 GHz | 533 MHz | 512 KB | P15 or greater | All board revisions support these processors | |
| 2.66 GHz | 533 MHz | 512 KB | P15 or greater | ||
| 2.6 GHz | 400 MHz | 512 KB | P15 or greater | ||
| 2.53 GHz | 533 MHz | 512 KB | P10 or greater | ||
| 2.5 GHz | 400 MHz | 512 KB | P15 or greater | ||
| 2.4B GHz | 533 MHz | 512 KB | P10 or greater | ||
| 2.4 GHz | 400 MHz | 512 KB | P10 or greater | ||
| 2.26 GHz | 533 MHz | 512 KB | P10 or greater | ||
| 2.2 GHz | 400 MHz | 512 KB | P10 or greater | ||
| 2.0A GHz | 400 MHz | 512 KB | P10 or greater | ||
| 2.0 GHz | 400 MHz | 256 KB | P10 or greater | ||
| 1.9 GHz | 400 MHz | 256 KB | P10 or greater | ||
| 1.8A GHz | 400 MHz | 512 KB | P10 or greater | ||
| 1.8 GHz | 400 MHz | 256 KB | P10 or greater | ||
| 1.7A GHz | 400 MHz | 512 KB | P10 or greater | ||
| 1.7 GHz | 400 MHz | 256 KB | P10 or greater | ||
| 1.6A GHz | 400 MHz | 512 KB | P10 or greater | ||
| 1.6 GHz | 400 MHz | 256 KB | P10 or greater | ||
| 1.5 GHz | 400 MHz | 256 KB | P10 or greater | ||
| 1.4 GHz | 400 MHz | 256 KB | P10 or greater |
†This desktop board and
processor combination is under evaluation and not yet
validated. Use of unsupported processors may result in
improper operation, damage to the desktop board or processor,
or reduced product life. Except as provided in Intel's Terms
and Conditions of Sale for such products, INTEL ASSUMES NO
LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR
IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF THE INTEL
PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO
FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR
INFRINGEMENT OF ANY PATENT COPYRIGHT OR OTHER INTELLECTUAL
PROPERTY RIGHT. This information is based on current
expectations are subject to change without notice.
The board supports four 2.5V RDRAM* RIMM* sockets.
- Minimum of 128MB of system memory
- Maximum of 24 PC1066 RDRAM devices per channel
- Maximum 1.5 GB PC1066 onboard capacity utilizing 256/288 Mbit technology
- Maximum of 32 PC800 RDRAM devices per channel
- Maximum 2 GB PC800 onboard capacity utilizing 128/144 Mbit or 256/288 Mbit technology
- Single or double-sided RIMM modules
- Support for PC1066-32P compliant RDRAM with 533 MHz front side bus (FSB) operation**
- Support for PC800-40 compliant RDRAM with 533 MHz FSB operation
- Support for PC800-40 and PC800-45 compliant RDRAM with 400 MHz FSB operation
- Serial Presence Detect (SPD) memory only
- ECC and non-ECC support
**Note: PC1066-32P support is only available on D850EMV2 desktop boards with AA#'s C18369-603 and C18361-602 or later.
The boards support Ultra ATA/100 transfer rates. The 40-pin 80-conductor cable included with each board will support Ultra ATA/100 transfers.
Peripheral Interfaces
The boards each have a diskette drive interface, two PS/2 ports, two serial ports, and one parallel port. The boards also support up to five USB 2.0 ports; two ports routed to the back panel, two to the front panel connector, and one to the optional CNR.
Expansion Capabilities
The D850EMD2 board has three PCI slots, one optional CNR slot (shared with PCI slot 3), and one AGP connector. The AGP connector only supports the latest 1.5V 4X/2X graphics cards and not the 3.3V models. The CNR slot and PCI slot 3 are shared and cannot be used simultaneously.
The D850EMV2 board has five PCI slots, one optional CNR slot
(shared with PCI slot 5), and one AGP connector. The AGP
connector only supports the latest 1.5V 4X/2X graphics cards
and not the 3.3V models. The CNR slot and PCI slot 5 are shared
and cannot be used simultaneously.
Windows*** 98 Second Edition, Windows ME, Windows 2000, and Windows XP support the D850EMD2 and D850EMV2 boards' ease of use, USB expansion, and power management features.
***Note: Only Windows 2000 and Windows XP support USB 2.0. Installation of Windows 98 SE or Windows ME will result in standard USB 1.1 functionality.