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D850MD Mothrbrd-P4 Socket 478 Intel 850 mATX 2GB RDRAM 400MHz Bus
(MPN: BOXD850MDL)
Price Range: $49.95 - $113.85 from 6 Sellers
Rebates & Special Offers: $5.00 Bonus available.
Description: The Intel Desktop Board D850MD harnesses the advanced computing power of the Intel Pentium 4 processor. Designed for the Intel 850 chipset, the Desktop Board D850MD utilizes the full bandwidth and performance in the Pentium 4 processor with dual RAMBUS channels and support for Intel NetBurst microarchitecture. The Desktop Board D850MD offers the highest performance platform solution on the mPGA478 socket, supporting Pentium 4 processors with frequencies extending beyond 2 GHz. This provides unprecedented system efficiency and responsiveness for those who wish to stay on the cutting edge of the digital world.

Here are the vitals on the Core 2 Extreme QX6850. This processor is yet another spin on Intel's Kentsfield quad-core product, which incorporates two Core 2 Duo chips onto a single package for a quartet of bit-flipping goodness. Like other Kentsfield-based products, it has a total of 8MB of L2 cache, or 4MB per chip. The QX6850 distinguishes itself from its direct predecessor, the QX6800, with the addition of a 3GHz core clock frequency and a 1333MHz front-side bus. Intel has moved the bulk of its Core 2 lineup to this higher bus speed, whose benefits we first tested in our review of the Core 2 Duo E6750. At that time, we concluded that a 1333MHz front-side bus wasn't much help to a dual-core processor, but it might be more of a boon to a quad-core part, especially because the two chips on Kentsfield processors communicate between themselves via this bus.

Memory Slots
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106007, 4006121R


These are the four memory slots on the motherboard. The slots support the following:

240-pin DDR2 SDRAM Dual Inline Memory Modules (DIMMs)
DDR2 667 or DDR2 533 MHz DIMMs
Memory capacity up to 4 GB total memory


Channel B slots (top pair in this graphic) are closest to the edge of the board, channel A slots (bottom pair in this graphic) are closest to the processor. The color of the release latches on each pair of slots indicates DIMM 0 (white latches) or DIMM 1 (black latches) for the respective channel.

Memory Configurations


Dual channel (Interleaved) mode - This mode offers the highest throughput for real world applications. Dual channel mode is enabled when the installed memory capacities of both DIMM channels are equal. Technology and device width can vary from one channel to the other but the installed memory capacity for each channel must be equal. If different speed DIMMs are used between channels, the slowest memory timing is used.
Single channel (Asymmetric) mode - This mode is equivalent to single channel bandwidth operation for real world applications. This mode is used when only a single DIMM is installed or the memory capacities are unequal. Technology and device width can vary from one channel to the other. If different speed DIMMs are used between channels, the slowest memory timing is used.

An expansion card (also expansion board, adapter card or accessory card) in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard to add additional functionality to a computer system. One edge of the expansion card holds the contacts (the edge connector) that fit exactly into the slot. They establish the electrical contact between the electronics (mostly integrated circuits) on the card and on the motherboard.

Connectors mounted on the bracket allow the connection of external devices to the card. Depending on the form factor of the motherboard and case, around one to seven expansion cards can be added to a computer system. There are also other factors involved in expansion card capacity. For example, some expansion cards need two slots like some NVidia GeForce FX and newer GeForce graphics cards and there is often a space left to aid cooling on some high-end cards.

Some cards are "low-profile" cards, meaning that they take up little physical space. (There is a "low profile PCI card" standard [1] [2] that specifies a much smaller bracket and board area). The group of expansion cards that are used for external connectivity, such as a network, SAN or modem card, are commonly referred to as input/output cards (or I/O cards).

Dimensions for the metal plate on the expansion card is 120mm wide, and 18mm high.

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