Hey, I took a quick trip to the Lake myself - didn't see ya up there! Weather was great - it suddenly decided to rain in Central Tx last week, most we've had in almost 2 yrs - but the bugs also loved it and were out in force.
Here's my results from Sandra using 3 different monitor drivers. The Sceptre and my Samsung drivers gave identical results - the Plug N Play a little different. But they all differ from yours and all list some 1680x1050 modes and don't list the 1920x1080 modes shown on your results. And setting the Display settings in XP to show All Modes has no effect on Sandra's results.
Here's what I think we can learn from this. The characteristics that your monitor actually has affects the Sandra modes listed more than the driver you're using. And according to this, my monitor supports 1680 modes and not 1920 modes - which is correct. Your monitor supports 1920 modes but not 1680 modes - according to Sandra.
You mentioned that this monitor shows the 1680 mode on your other computer. But isn't the other computer running the Sceptre monitor as an Analog device? And aren't you trying it as a digital device on the Gigabyte board? Have you tried it on the other cable, Analog, on this new board? My monitor shows different modes at the high-end when I plug it in with the VGA rather than DVI-D connector. Yours likely will too. Maybe it only runs the 1680 modes as an analog device? Note the changes when I run it as Analog from Sandra below.
You didn't post the Monitor results from Sandra - by pulling down Video Adaptor and choosing Monitor. I posted mine below, showing only the relevant info. It seems correct for my Samsung. Be interesting to see the same results for your Sceptre - these likely aren't affected by either driver or adaptor.
If you do decide to return the motherboard, despite the headaches it may have caused, you might try a replacement first. I'm convinced this is a good motherboard - and I assume you like it otherwise. Getting a different one may lead you to other issues. And you might point Newegg to this forum thread if you do change boards - it'll give you ammo for not paying the restocking fee. (I recently did this with my original 1066 memory which wanted 2.2V and they dropped the fee.)
Notice btw, that I'm running my 4200 at increased speed (500MHz > 800MHz), increased memory speed (400MHz > 533MHz) because of my 1066 RAM and decreased RAM devoted to the card (512MB > 256MB) because I can't find any need for it with my applications. This gives me an extra 256GBs of system RAM delivered to Win XP (3GBs total). So, the board does have some nice features which allow enchanced video.
Also, the year 2000 BIOS date reported by Sandra seems to be an error by the software, can't find that anywhere else. It also reports a completely wrong monitor serial number and other mistakes in other sections.
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Sandra Results for different Video Drivers and Analog/Digital - showing only modes 100 and above:
Sceptre Driver:
Mode 100 : 1280x960 64K HiColour (16-bit) 60Hz 70Hz 72Hz 75Hz
Mode 104 : 1280x960 16M+ TrueColour (32-bit) 60Hz 70Hz 72Hz 75Hz
Mode 106 : 1280x1024 256 colours (8-bit) 60Hz 70Hz
Mode 108 : 1280x1024 64K HiColour (16-bit) 60Hz 70Hz
Mode 110 : 1280x1024 16M+ TrueColour (32-bit) 60Hz 70Hz
Mode 111 : 1680x1050 256 colours (8-bit) 60Hz
Mode 112 : 1680x1050 64K HiColour (16-bit) 60Hz
Mode 113 : 1680x1050 16M+ TrueColour (32-bit) 60Hz
Plug N Play Driver:
Mode 100 : 1280x960 64K HiColour (16-bit) 60Hz 70Hz 72Hz 75Hz
Mode 104 : 1280x960 16M+ TrueColour (32-bit) 60Hz 70Hz 72Hz 75Hz
Mode 107 : 1280x1024 256 colours (8-bit) 60Hz 70Hz 75Hz
Mode 110 : 1280x1024 64K HiColour (16-bit) 60Hz 70Hz 75Hz
Mode 113 : 1280x1024 16M+ TrueColour (32-bit) 60Hz 70Hz 75Hz
Mode 114 : 1600x1200 256 colours (8-bit) 60Hz
Mode 115 : 1600x1200 64K HiColour (16-bit) 60Hz
Mode 116 : 1600x1200 16M+ TrueColour (32-bit) 60Hz
Mode 117 : 1680x1050 256 colours (8-bit) 60Hz
Mode 118 : 1680x1050 64K HiColour (16-bit) 60Hz
Mode 119 : 1680x1050 16M+ TrueColour (32-bit) 60Hz
Samsung Driver - Digital DVI-D Connector:
Mode 100 : 1280x960 64K HiColour (16-bit) 60Hz 70Hz 72Hz 75Hz
Mode 104 : 1280x960 16M+ TrueColour (32-bit) 60Hz 70Hz 72Hz 75Hz
Mode 106 : 1280x1024 256 colours (8-bit) 60Hz 70Hz
Mode 108 : 1280x1024 64K HiColour (16-bit) 60Hz 70Hz
Mode 110 : 1280x1024 16M+ TrueColour (32-bit) 60Hz 70Hz
Mode 111 : 1680x1050 256 colours (8-bit) 60Hz
Mode 112 : 1680x1050 64K HiColour (16-bit) 60Hz
Mode 113 : 1680x1050 16M+ TrueColour (32-bit) 60Hz
Samsung Driver - Analog VGA Connector:
Mode 101 : 1280x960 16M+ TrueColour (32-bit) 60Hz 70Hz 72Hz 75Hz
Mode 103 : 1280x1024 256 colours (8-bit) 60Hz 70Hz
Mode 105 : 1280x1024 64K HiColour (16-bit) 60Hz 70Hz
Mode 107 : 1280x1024 16M+ TrueColour (32-bit) 60Hz 70Hz
Mode 108 : 1680x1050 256 colours (8-bit) 60Hz
Mode 109 : 1680x1050 64K HiColour (16-bit) 60Hz
Mode 110 : 1680x1050 16M+ TrueColour (32-bit) 60Hz
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Chipset
Model : RV610
Type : Integrated
Speed : 800MHz
Maximum Speed : 500MHz
OverClock Factor : 60%
Shader Speed : 800MHz
Maximum Speed : 500MHz
OverClock Factor : 60%
Peak Processing Performance (PPP) : 64GFLOPS
Adjusted Peak Performance (APP) : 57.6WG
Unified Shaders : 40 Unit(s)
Raster Operation Units (ROP) : 4 Unit(s)
Texture Mapping Units (TMU) : 4 Unit(s)
Maximum Pixel Fillrate : 3.2GPixel/s
Maximum Texture Fillrate : 3.2GTexel/s
Maximum Power : 14.00W
Logical/Chipset Memory Banks
Total Memory : 256MB
Memory Bus Speed : 2x 533MHz (1GHz)
Maximum Memory Speed : 2x 800MHz (1.6GHz)
Channels : 1
Width : 32-bit
Maximum Memory Bus Bandwidth : 4.16GB/s
Video BIOS
Date of Manufacture : Friday, June 02, 2000
------------------------------------------------ Monitor Results
Monitor/Panel
Manufacturer : Samsung
Model : SyncMaster 2232BW/2232GW/2232GW Plus,SyncMaster Magic CX2232GW(Digital)
Maximum Resolution : 1680x1050
Horizontal Scan Range : 30-81kHz
Vertical Refresh Range : 56-75Hz
DPMS Energy Star Compliant : Yes
Established Timings
Mode 0 : 720x400 70Hz
...
Mode 10 : 1024x768 87Hz
Mode 11 : 1024x768 70Hz
Mode 12 : 1024x768 75Hz
Mode 13 : 1280x1024 75Hz
Mode 14 : 1152x870 75Hz
Standard Timings
Mode 0 : 1680x1050 (16:10) 60Hz
Mode 1 : 1280x1024 (5:4) 60Hz
Mode 2 : 1280x960 (4:3) 60Hz
Mode 3 : 1152x864 (4:3) 75Hz