发信人: pcsoul(电脑幽灵·累了·不想熬夜)
整理人: pcsoul(2001-02-17 02:06:40), 站内信件
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就是IWILL提到的那篇，方便大家，我转过来了，可惜只有英文版，那位有办法翻译一下，还有那个超频的我就不转了，如果要看的话，可以到这个地址看：
http://www.tomshardware.com/mainboard/01q1/010201/dual-05.html
相关的图片：http://www.tomshardware.com/mainboard/01q1/010201/index.html
A Rare Find: Dual CPU Boards
In the multitude of single processor motherboards, there is a small
number of boards designed for dual CPU operation. These boards are
particularly suitable for small graphics workstations or servers
requiring high computing capacity and, at the same time, fast data
transfers. However, in comparison with the boards for only one CPU,
the dual boards are slightly more expensive: While a socket 370 board costs approx. $90 to $110 depending on its equipment configuration,
a dual board will cost at least $140. To this you've got to add the
cost for a second CPU.
Presently, there are two different chipsets on the market for the
socket 370 platform supporting the operation of two processors: These
include the Intel 815E and the VIA Apollo Pro 133A - also known as VIA 694XDP. In this context, we have thoroughly
examined the Acorp 6A815D, the first dual board to be equipped with
the Intel 815E, as well as the Asus CUV4X-D that works with VIA 694XDP. All the tests were conducted under
Windows 2000 Pro, since Windows 98 SE and Windows ME do not offer
multi-processor support. Let us state right now: This test brought not only
exciting but also sobering results - but read for yourself!
Only the special VIA northbridge variant offers dual processor support
. While version VT82C694X is only suitable for single operation,
version VT82C694XDP offers dual CPU support.
Initially not intended for dual operation: Northbridge by Intel 815E.
Intel 815E or VIA 694XDP?
Chipset Intel 815E VIA Apollo Pro 133A Intel 820 Intel 840 Intel 440BX Intel 440GXRelease June 2000 November 1999 November 1999 October
1999 April 1998 June 1998
CPU platform Socket 370 Slot 1/Socket 370 Slot 1/Socket 370 Slot 1
Slot 1/Socket 370 Slot 1/Slot 2
Multiprocessor support yes yes yes yes yes yes
Northbridge Intel 82815 VIA VT82C694XDP Intel 82820 Intel 82840 Intel 82443 Intel 82446
Southbridge Intel 82801BA VIA VT82C686B Intel 82801AA Intel 82801AA Intel 82371EB Intel 82371EB
System bus clock (FSB) 66/100/133 MHz 66/100/133 MHz 66**/100/133 MHz 100/133 MHz 66/100/133* MHz 66/100 MHz
Memory clock 66/100/133 MHz 66/100/133 MHz 66**/100/133 MHz 100/133 MHz 66/100/133 MHz 66/100 MHz
Asynchronous memory clock yes yes no no no no
33 MHz PCI @ 133 MHz FSB yes yes yes yes no no
FSB Overclocking*** up to 166 MHz up to 160 MHz up to 155 MHz no up to 155 MHz no
max. number of DIMM or RIMM slots 3 4 2 4 4 4
max. Memory 512 MB 1536 MB 1024 MB 2048 MB 1024 MB 2048 MB
VC-SDRAM support no yes no no no no
DDR-SDRAM support no no no no no no
RIMM support (Rambus) no no yes yes no no
Dual Rambus support no no no yes no no
UltraATA/33/66/100 yes/yes/yes yes/yes/yes yes/yes/no yes/yes/no yes/no/no yes/no/no
Number of USB ports 4 4 2 2 2 2
Number of IRQs for PCI slots 6 5 6 6 4 4
Integrated graphics core yes no no no no no
AGP 1x / 2x / 4x yes / yes / yes yes / yes / yes yes / yes / yes yes / yes / yes yes / yes / no yes / yes / no
ACPI features yes yes yes yes yes yes
This table shows a comparison of the most important dual CPU chipsets. Production of Intel 440BX and Intel 440GX has already been
discontinued.
The table above lists the features of the most important chipsets
offering multi-processor support. The latest candidate is the Intel 815E which,
initially, was not designed for use as a dual platform. Rather,
Intel was pinning its hopes on the Rambus-based chips i820/Camino and i840/Carmel which were, however, not
accepted on the market because of their high price levels. What other options does a PC manufacturer have if he wishes to configure a
powerful dual CPU system? At the moment, there are two low-cost solutions for equipping a board for dual operation with Pentium
III. On the one hand, the VIA Apollo Pro 133A chipset can be installed in a special dual variant (Northbridge VT82C694XDP)
or, alternatively, one reverts to the slightly more expensive
Intel 815E which is,
however, only capable of managing 512 MB of main memory.
Intel 815E or VIA 694XDP?, Continued
The direct comparison of both chipsets reveals many similarities.
Both chips support variable clock speeds for the front side bus and
memory speed. Overclocking proponents can (depending on the particular clock generator used) clock the memory up to 166 MHz, although in
most
cases system stability is not guaranteed. The score was level
concerning functions such as AGP4x, UltraATA/100 and 4 USB ports,
with both chipsets offering these features. Intel 815E's standard
version is also offering onboard graphics, which is hardly worth
mentioning because of its limited performance. The VIA Apollo Pro
133A also offers a unique selling point: It works with VC-SDRAM memory which you will hardly find on the market. This memory
technology brought to life by NEC turns out to be rather unsuccessful.
So much for theory - one glance at both test candidates reveals the details.
Acorp 6A815D is based on the Intel 815E chipset and also offers,
in addition to AGP 4x and Ultra-DMA/100, variable clock speeds for the FSB and memory. Please note
however that this board is a pre-production sample.
The Asus CUV4X-D has similar attributes: AGP 4x, Ultra-DMA/100 and numerous clock speed settings.
Dual Twice: Acorp 6A815D and Asus CUV4X-D
The Acorp 6A815D is the first candidate equipped with two CPU sockets.
It is based on the Intel 815E chipset. Not too much can be said about
the final stage because this board is a very early beta sample.
Because the board is equipped with an additional Promise controller
chip, a total of four IDE interfaces with UltraATA/100 support are
available. The placement of a total of five PCI slots seems sufficient
, while the installation of the CNR slots appears more than
questionable. Which customer or user who chooses a dual board as the
basis for a powerful workstation will fall back on the low-cost CNR for which no corresponding cards are available yet either?
Due to the additional Promise controller, the Acorp 6A815D is
equipped with four IDE interfaces with UltraATA/100.
View of the Promise controller connecting UltraATA/100 with Raid
functionality.
The arrangement of both CPU sockets deserves slight criticism: They
are both installed at an angle of 90° to each other, preventing
optimum cooling air flow in the casing. However, the test did not
reveal any thermal problems. In irregular intervals, the Acorp 6A815D refused to operate by just not booting again. Only pressing the
power switch several times brought remedy. These deficiencies can be
traced back to the early revision of this board, which was still
fitted with numerous correcting wires on the underside.
Dual Twice: Acorp 6A815D and Asus CUV4X-D, Continued
Asus CUV4X-D: A terminator has to be inserted into the second CPU socket for
single CPU operation
The Asus CUV4X-D is equipped with an additional power supply slot which can be used
for powerful OpenGL graphics cards.
The AGP Pro connector offers additional power supply for graphics
cards. Aside from the 3.3 V standard, 1.5V are provided as well.
By contrast, the Asus CUV4X-D attracted much less attention by rendering its services reliably.
A striking feature of this board is the AGP-Pro slot, which can also accept powerful OpenGL graphics cards
because of its more stable and thus more powerful power supply.
Since the CPU sockets are arranged at an angle of 90° to each other, just like the Acorp's sockets, basically the same applies: The flow
of cooling air when installing in a PC casing is by no means optimum! Rather, additional fans should be installed to achieve optimum
cooling. Compared to the Acorp 6A815E, the Asus CUV4X-D features four DIMM sockets, which allow maximum memory expansion
of up to 1536 MB.
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