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Intel Pentium 4 and i850 chipset reviewed
Intel 850 Chipset & D850GB Motherboard
As with any new Processor, inevitably these days you would be correct in predicting a new chipset and motherboard to support it. This certainly
rings true for the Intel Pentium 4 processor announcement. Enter the Intel 850 chipset and the accompanying Intel D850GB Motherboard. We also
understand there are other Taiwanese manufacturers that are to launch Motherboards based around the i850 chipset, and in due course we are
certain we shall feature a Motherboard roundup of these manufacturers offerings.
WARNING: Intel has also introduced two new areas, stated in their new ATX 2.03 specification which will require your attention as it seems the
changes already discussed do not stop there. Firstly, besides needing a new motherboard, coupled with the new chipset and memory, you will
inevitably also need a new case, as the mounting holes for the Pentium 4 are somewhat changed to make room for the Pentium 4's heatsink
retention mechanism in the case. Secondly, in the new specification it calls for a ATX12V power supply which allows support for the additional
power connector required by the i850 boards, allowing for power to be supplied around the CPU, this was inevitable taking into consideration
the higher clock frequency CPU's that we are going to be seeing in the future.
We have already covered the Intel i850 chipset in our previous section, but a picture of its architecture would do no harm, as you can see the
i850 Memory Controller Hub (MCH) supports two RDRAM channels and hence the issues surrounding RDRAM are somewhat lessened by the doubling the
amount of bandwidth that is available. The D850GB Motherboard has two Dual RDRAM channels with two RIMM sockets per channel
(four RIMM sockets). The channels must be mirror images of each other, that is 1 RIMM and one Continuity RIMM per channel or 2 RIMMs installed
per channel.
Intel® Desktop Board D850GB Technical Specifications
| Processor |
| Processors Supported (via PPGA423 connector) |
Intel® Pentium® 4 processors with Intel® NetBurst™
micro-architecture which includes 400 MHz system bus in the PPGA package supports speeds starting at 1.4 GHz.
|
| Chipset |
| Intel 850® chipset |
Intel® 82850 Memory Controller Hub (MCH) with AHA (Accelerated Hub Architecture) bus Intel 82801BA I/O Controller Hub (ICH2)
with AHA bus Intel 82802AB Firmware Hub (FWH)
|
| Memory Controller Hub (MCH) |
| |
Integrated dual Direct RAMBUS memory technology Support for 128 MB to 2 GB main system memory
|
| I/O Controller Hub (ICH2) |
| ICH2 I/O Controller Hub |
Ultra ATA/66/100
Ultra DMA/33
Six PCI request-grant pairs for support of six PCI Bus Masters
|
| I/O Features |
Integrated Super I/O LPC bus controller
Five PCI Local Bus slots
Communication and Networking Riser (CNR)* (optional), shared with PCI slot 5
Power Management support for both ACPI 1.0 and APM 1.2
PC 99 and PC 99A Compliance
|
| USB |
Two USB controllers with four USB ports
- Two-port stacked rear connector
- Header for cabling two ports to the front panel
|
| Firmware Hub |
| System BIOS |
4-Mb Flash EEPROM with Intel/AMI* BIOS featuring Plug and Play, IDE drive auto-configure
Advanced Power Management (APM) 1.2, ACPI 1.0, DMI 2.0, Multilingual support
|
| Intel® Rapid BIOS Boot |
Optimised POST delivers faster access to PC from power-on
|
| System Memory |
| Memory Capacity |
Four 168-pin unbuffered RIMM sockets for 128 MB (min) to 2 GB (max) RDRAM
|
| Memory Type |
PC600 or PC800 Dual-channel RDRAM
|
| Memory Voltage |
2.5 V
|
| Hardware Management Features |
| |
Voltage sense to detect out of range values
Fan-sensor inputs used to monitor fan activity
Fan-speed control with temperature
|
| Enhanced Diagnostics |
| |
Four dual-colour LEDs on back panel for hardware diagnostic decoding during power-on self-test
|
| Wake-Up From Network |
| |
Wired for Management (WfM) 2.0 compliant
Support for system wake up using an add-in network interface card with remote wake-up capability or PCI
|
| Expansion Capabilities |
| |
Five PCI bus add-in card connectors (PCI Local Bus Specification Revision 2.2)
One Communication and Networking Riser (CNR) connector shared with PCI slot 5
One 1.5V 4X/2X AGP Port connector
|
| Jumpers and Front Panel Connectors |
| Jumpers |
Three-pin jumper block to set configuration mode for the BIOS
Set-up program
CNR configuration jumper (optional)
|
| Front Panel Connector |
Reset, HD LED, Power LEDs, Power On/Off, Standby header, IR Port, Aux LED
|
| Mechanical |
| Board Style |
ATX 2.03 compliant board size
|
| Board Size |
(12.0"x9.6")
|
| Baseboard Power Requirements |
Utilizes new ATX12V spec with these requirements:
+3.3V 20A
+5V 25A
+12V 13A
-12V .8A
+5VSB 1.5A
-5V .3A
|
| Environment |
| Operating Temperature |
0° C to +55° C
|
| Storage Temperature |
-40° C to +70° C
|
| Safety Regulations |
| US and Canada |
UL 1950-CSA 950-95, US and Canadian recognition component marks
|
| Europe |
Classified to IEC 950
|
| EMI/RFI reg: |
Intended for use in systems meeting the following EMI/RFI regulations:
|
| US |
FCC Class B (DofC - Cover off testing)
|
| Canada |
IC Class B
|
| Europe |
EU Class B (Res, Com, Light Industry)
|
| Japan |
VCCI, Class B (ITE)
|
| Power requirements vary. |
Complies with US CRF via EN55022 + 6db in with system configuration an open chassis and EU Directive 89/336/EEC and use. Via EN55022 and
EN50082-1 in a representative chassis.
|
The Boxed Intel® Desktop Board D850GB Solutions includes:
- Desktop Board D850GB
- ATX compliant I/O shield
- Cables: one Ultra ATA/33, one Ultra ATA/100 and one floppy cable
- AGP Retention Mechanism (recommended for AGP 4X support)
- Two Continuity RIMM Modules
- Quick Start Guide
- Configuration label, stickers, back-panel label and a battery-warning label
- CD-ROM with software drivers, warranty, Product Guide and value-added software applications
- Processor Retention Mechanism
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