Shuttle attempted to journey into VIA's world a few times late in '97 and early this year, unfortunately their motherboard releases simply didn't draw enough attention to make a big enough impact on the industry as their unstoppable TX motherboards did a year ago.  Shuttle brought a few new cards to the table with each motherboard release after their highly successful 565/569 combination, adding features such as CPU Voltage Auto-Detect and increased numbers of core voltage steppings to accommodate the needs of overclockers. 

Now armed with a new chipset, the VIA MVP3, and a new processor to support, the AMD K6-2, Shuttle took a trip down memory lane with their newest concoction the HOT-591P.  However times have changed since Shuttle ruled the Socket-7 AT world, how well does the 591P stack up to fierce threats from the competition?  Keep your eyes peeled as AnandTech takes a look at Shuttle's Super7 infant, let's find out how hot this board really is, or has Shuttle's reign truly ended?

Anand Tech Report Card Rating
90/B+

The Good

The HOT-591P definitely gives new meaning to the term 'Baby-AT Form Factor Motherboard' as it measures in at a mere 22 cm x 22 cm (about 8.7" x 8.7"), at the same time it leaves enough space to accommodate 3 PCI and 3 ISA slots while reserving space for the single AGP slot that makes up 1/3rd of the Super7 requirements (the other two being support for Super7 processors and support for the 100MHz Front Side Bus Speed).   Near the AT & ATX Power Supply connectors on this Baby AT motherboard are the memory expansion slots, giving the user two avenues of memory expansion Shuttle outfitted the 591P with 2 72pin SIMM slots (1 bank) and 2 168pin DIMM slots (2 banks), both of which function perfectly.  If you're worrying about stability problems with your old 60ns EDO SIMMs and the 100MHz Front Side Bus (FSB) on the 591P then you need not worry since, courtesy of the VIA MVP3 Chipset, you can lock your memory bus at the same speed of your AGP Bus.  This translates into a mode in which your CPU and L2 cache take advantage of the 100MHz bus speed, while your Memory runs at the same speed your AGP Card operates at, which should be at or around 66MHz, meaning as long as your memory works at the 66MHz FSB then you'll be perfectly fine running your system at the 100MHz FSB setting. 

At a first glance the VIA logo on the VT82C598AT chip on the board may give you the impression that this is no more than a tiny Apollo VP3 based motherboard, however the model number obviously reveals that it is a genuine MVP3 chipset ready for some K6-2 action.  The 512KB of L2 cache on-board ensure that all memory up to the 128MB limit will remain completely cached, with all [uncached] memory above that limit (while remaining under the 256MB System Memory limit) accessed with a 10 - 15% decrease in performance.

Once again we see the unique Shuttle features brought to the table this time with the HOT-591P, the conventional Shuttle Installations Guide packaged with the motherboard documents virtually all the features of the board itself.  The adjustable core voltage can be controlled manually or it can be auto-detected by the motherboard's Award BIOS.  In the tests run, the 591P had no problem detecting the proper voltage settings for the Cyrix 6x86MX, Intel Pentium MMX, AMD K6, and AMD K6-2 used.  This does help tremendously as the jumper setup on Super7 motherboards will prove to be a very tedious process as there are an abundance of jumpers to configure and track down all over the board.  Unfortunately the rest of the settings can't be modified in the BIOS Setup, instead they must be set manually with the Installation's Guide as your only aid, for once Shuttle's attempt to keep the documentation simple was counteracted by the fact that the board required much more documentation than was provided.

The 591P box contains the usual Shuttle motherboard "apparel" including the Installation's Guide mentioned above, a Spacewalker CD-ROM containing the latest VIA Bus Master IDE Drivers, and the virtual device drivers (VxD) that breathe life into the Graphics Address Remap Table (GART) functions of the motherboard's on-board AGP slot.  Setting up the test system wasn't much of a problem, the BIOS automatically recognized the clock speeds of the processors properly, even when using the 100MHz FSB.  Windows 95 had no problem installing the Bus Master and the AGP GART drivers, within a few minutes of completing the Windows 95 installation on the test UltraDMA Hard Drive everything was ready for the performance tests.

The price of the HOT-591P is one of its strong points, expect the board to sell for under $100, more specifically around the $90 mark.   Combine that with the relatively low price of the AMD K6-2 266 and 300 and you've got a real knock-out on your hands...or do you?

The Bad

Shuttle knew they would have to make sacrifices by constructing a motherboard this small, one of them happens to be the inability for a full length PCI card to occupy any one of the PCI slots.  What this means is that the HOT-591P will NOT accept a Voodoo2 accelerator, even the Canopus Pure3D II which is a full inch shorter than the rest of the Voodoo2 boards out there won't fit.   The CPU Socket is in the way of all of the PCI slots, a sad reality is that in spite of this, all 3 ISA slots can accept full length cards. 

Update - 8/27/98: Shuttle has released a newer revision of the HOT-591P which uses the newest 'CE' MVP3 Chipset Revision clearing up any incompatibilities between the board and the i740 graphics chipset, the board also replaces the 90MHz FSB setting with a 95MHz setting for the K6-2 333.   Using Shuttle's supplied Foxconn Iceberg low profile cooling fan, the shared PCI slot on the 591P can be occupied by a full length PCI card such as a Voodoo2 making this board a more viable alternative for many users.

The performance of the 591P could be better, in comparison to the Epox and AOpen motherboards the 591P still lies a couple percent behind, however you won't notice that much of a difference in real world usage although the difference will be there in the benchmarks.  While the board features 2.3v and 2.4v core voltage settings, the K6-2 300 wouldn't perform reliably at 100 x 3.5 (350MHz), it looks like we need more than a few tenths of a volt to get the K6-2 300 up to 350MHz. Hopefully by the time AMD cranks up the production of the chips their yields will increase allowing us to push the limits of motherboards like the 591P. 

The 83 and 90MHz overclocked bus speed settings wouldn't boot at all, regardless of what processor was used, while this may not be a problem for some there are those out there who still want to take advantage of these two unique settings, don't plan on doing so with the 591P.

Of course the documentation could use a bit of improving, it looks like Shuttle tried to stick to their old ways too closely with the Installation's Guide packaged with the 591P.  First time builders/upgraders will probably find the jumper setup more than a little confusing, while those with a little more experience and knowledge of the MVP3 chipset's features won't have too difficult of a time.

• Allows user to individually set IRQs for each Legacy ISA card

BIOS Settings

Recommended SDRAM

Recommended SDRAM: AMM PC100 SDRAM, Azzo PC100 SDRAM, Corsair PC100 SDRAM; Memory Man PC100 SDRAM
SDRAM Tested: 1 x 64 AMM PC100 SDRAM, 1 x 64 Azzo PC100 SDRAM, 1 x 64MB Corsair PC100 SDRAM; 1 x 64MB Memory-Man PC100 SDRAM

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

Manufacturer: Azzo Computers
Purchase Web-Site: http://www.azzo.com

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

Manufacturer: The Memory Man
Purchase Web-Site: http://www.memory-man.com

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 98 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

• 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

• Tests using AGP Video cards were only run under Winstone 97, as the AGP Millennium II does not affect the Business Winstone 98 score when compared to the PCI Millennium II used in the tests.

• 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 16-bit color depth

The Final Decision

Shuttle has a decent motherboard on their hands with the HOT-591P, and what's important is that they managed to crank out an actual product unlike most other manufacturers working on Super7 products.  While the HOT-591P still leaves much to be desired, if it satisfies your immediate needs then this sub-$100 wonder may just be the thing you need.  Otherwise, the Epox and AOpen boards are always viable options.