Original Link: http://www.anandtech.com/show/38


by Anand Lal Shimpi on January 9, 1998 4:39 PM EST

While a great number of those that visit this page have tried their hands at overclocking, in the big picture, the overclocking population is quite small compared to everyone else.  Most users either don't know about overclocking, can't overclock, or don't wish to take the risks involved.   It seems as though for users like that the motherboards available to you...are...well, just about everything.  However how do you narrow down the options to a few really good motherboards?  How about one that truly stands out among the competition, since it isn't an overclocker's board the TMC AI6NL has no strengths other than the basics, stability, quality, reliability, and performance.  Never heard of TMC?  You're about to hear some great things about their Pentium II flagship motherboard, the AI6NL.

Motherboard Specifications

Socket Style:

Slot 1

Chipset: i82440LX
Cache: N/A (On Chip)
Form Factor: AT (w/ AT & ATX PS Connectors)
BUS Speeds: 60 / 66 MHz
Clock Multipliers: 3.5x / 4.0x / 4.5x / 5.0x
Voltages Supported: 1.5v - 3.5v (Auto Detect)
RAM Slots: 3 168pin DIMM Slots (EDO/SDRAM)
AGP/PCI/ISA Slots: 1 AGP Slot
3 PCI Slots
3 ISA Slots (1 Shared / 3 Full Length)
PCI EIDE Controller: Super I/O
2 EIDE Channels
1 FDD Channel
2 Serial /1 EPP


The Good

Let's dig right into this baby, controlled almost entirely by Dip Switches, unlike the common jumperless setups found on most Pentium II LX motherboards, the AI6NL does feature one very important jumper which allows you to switch between both supported power supplies, AT or ATX.  Usually combination AT/ATX motherboards are oddly shaped, and conform to the AT specification over the ATX specification whenever possible.  In spite of this the AI6NL's layout is quite spacious, the only time it can get annoying is if you have a mini-tower case, it isn't recommended to use anything smaller than a mid-tower AT case with the AI6NL, a Full Tower being the preferred environment. ai6nl2.jpg (18662 bytes)

Having never seen a TMC manual before, the cover was impressive looking to the least, the contents on the other hand...put the competition to shame.  If we call ABIT the reigning champ of making quality user's manuals, the TMC user's manual is as close as you can get to the ABIT manual without violating any copyright laws. 

For an AT motherboard, TMC tried to bring all of the expansion features of an ATX motherboard to the AI6NL, however they were only partially successful in doing so, outfitting the board with 3 DIMM slots, 3 PCI, 1 AGP (between the 1st PCI and last ISA slot) and 3 ISA slots.  One advantage to the extreme length of the AI6NL is the fact that all expansion slots can accept full sized cards. ai6nl1.jpg (14724 bytes)

The motherboard itself appears to have been designed with quality and reliability in mind, making excellent use of about 22 mid sized capacitors, 4 average height voltage regulator heatsinks, and a beautiful layout, the AI6NL is a very user friendly motherboard.  If this happens to be your first home built system, the AI6NL will ensure that your first experience was a pleasant one.   In all tests, using both PCI and AGP video cards, the AI6NL never crashed once, with the system continuously humming and ticking away like the clock it beat consistently.

Configuring the AI6NL for testing was a breeze, the written documentation doesn't provide information to a few of the other possible combinations of the bus speed dip switches, however there doesn't seem to be any support for > 66MHz bus speeds with this motherboard.  The AMI BIOS the AI6NL sports does an average job of making the setup process less of a chore, although users of the Award BIOS may find that they are missing the familiar configuration utility.   The configurable options in the BIOS are pretty much standard for all LX motherboards, and the AI6NL could be run using the most aggressive BIOS timings without any problems at all regardless of what brand of SDRAM was used, mind you that some cheap generic modules won't be as solid as those that are manufactured with quality/reliability in mind. 

Windows 95 booted without a problem, the installation of the Intel Bus Master IDE drivers went perfectly fine without a hitch, and Winstone was on its way to running its first test run.   Overall, the performance of the TMC AI6NL can't be beat by any other AT Pentium II LX motherboard, and remains fairly competitive when you place it in the entire Slot-1 arena, taking a back seat to the AOpen AX6L which still stands strong as one of the best overall Pentium II motherboards out today.

There are a few problems with the TMC AI6NL, however it is a down right decent motherboard.

The Bad

  • Pentium II 333 processors aren't detected properly by the BIOS that was shipped with the motherboard, the processor's cache was disabled, this can be corrected by a simple BIOS upgrade

  • No 75/83MHz bus speed support meaning the highest achievable clock speed is 333MHz

  • Manual CPU Configuration

Sometimes a list is better than a paragraph ;)


IRQ Usage

  • Auto-detects PnP Cards after HDD Detection

  • Allows user to manually set DMA Channels/IRQs to PnP cards or Legacy ISA cards


BIOS Settings

Use these settings for the TMC AI6NL, the test system didn't experience any problems at all with any BIOS Timings

ai6nl-bios.jpg (15889 bytes)


Recommended SDRAM

Recommended SDRAM: Advanced Megatrends SDRAM, Corsair SDRAM
SDRAM Tested: 1 x 64 Advanced Megatrends SDRAM DIMMs, 1 x 64MB BX PC100 Corsair SDRAM DIMMs

Manufacturer: Advanced Megatrends
Purchase Web-Site: http://www.megacom.com

Manufacturer: Corsair Microsystems
Purchase Web-Site: http://www.nf-ny.com


The Test

In recent times, choosing a motherboard cannot be completely determined by a Winstone score. Now, many boards come within one Winstone point of each other and therefore the need to benchmark boards against each other falls. Therefore you shouldn't base your decision entirely on the benchmarks you see here, but also on the technical features and advantages of this particular board, seeing as that will probably make the greatest difference in your overall experience.

How I Tested

  • Each benchmark was run a minimum of 2 times and a maximum of 5 times, if the motherboard failed to complete a single test within the 5 allocated test runs the OS/Software was re-installed on a freshly formatted Hard Drive and the BIOS settings were adjusted to prevent the test from failing again.  All such encounters were noted at the exact time of their occurrence.

  • Business Winstone 97 / Business Graphics Winmark 97 was run at each individually tested clock speed, if reliable scores were achieved with the first two test runs of the suite an average of the two was taken and recorded as the final score at that clock speed.  If the test system displayed erratic behavior while the tests were running or the results were incredibly low/high the tests were re-run up to 5 times and an average of all the test runs was taken and recorded at the final score at that clock speed

  • Business Winstone 98 / Business Graphics Winmark 98 was run on the Pentium MMX at 233MHz, and the AMD K6 at 233MHz, the averaging rules for these tests are the same as those used for the 97 test suites. 

  • Business Winstone 98 was run on the Pentium II at 300MHz alone.

  • After each motherboard was tested a complete format of the test hard drive was initiated and the OS/benchmarking software was re-installed afterwards a defragment was initiated using Windows 95's Disk Defragmentation Utility

  • No foreign drivers were present in the test system other than those required for the system to function to the best of its ability

  • All foreign installation files were moved to a separate partition during the test as to prevent them from effecting the test results

  • All tests were conducted at 800 x 600 x 256 colors

Test Configuration

Processor(s): Intel Pentium II - 300 (512K ECC)
Board Revision: 1
RAM: 1 x 64MB Corsair Microsystems PC100 SDRAM DIMMs
1 x 64MB Advanced Megatrends SDRAM DIMMs
Hard Drive(s): Western Digital Caviar AC21600H
Video Card: Matrox Millennium II (4MB WRAM - AGP)
Matrox Millennium II (4MB WRAM - PCI)
Bus Master EIDE Drivers: Intel 3.01
Video Card Drivers: MGA Millennium
OS: Windows 95 Service Release 2


Windows 95 Performance of the TMC AI6NL
CPU Business Winstone 97 Business Graphics Winmark 98
PCI Video AGP Video PCI Video AGP Video
Pentium II - 300 66.1 67.2 147 151
Pentium II - 338 Not Supported
Pentium II - 375 Not Supported


The Final Decision

The AT form factor Pentium II LX motherboard market is scarce right now, making the only competitors those that dominate the land, until another manufacturer steps up with a highly overclockable Pentium II LX (AT) motherboard the TMC AI6NL seems to be the best choice, there is always the MTech M628 as well.

Log in

Don't have an account? Sign up now