Can Intel 82865G do widescreen?
In a word, yes.
IntelĀ® 82865G Graphics Controller
Supported Video Modes
IntelĀ® 865G Chipset Supported Windows Configuration Modes
2D + O = 2D display + full screen overlay
2D = 2D display only
Screen
Resolution Color
Depth (bpp)
Refresh
Rate (Hz) Mode
Type
640 x 480 8, 16, 32 60, 72, 75, 85, 100, 120 2D + O
800 x 600 8, 16, 32 60, 72, 75, 85, 100, 120 2D + O
1024 x 768 8, 16, 32 60, 70, 75, 85, 100, 120 2D + O
1152 x 864 8, 16, 32 60, 75, 85, 100 2D + O
1280 x 720 8, 16, 32 60, 75, 85, 100 2D + O
1280 x 768 8, 16, 32 60, 75, 85 2D + O
1280 x 960 8, 16, 32 60, 75, 85 2D + O
1280 x 1024 8, 16, 32 60, 75, 85, 100 2D + O
1280 x 1024 8, 16, 32 120 2D
1400 x 1050 8, 16, 32 60, 75, 85 2D + O
1600 x 900 8, 16, 32 60, 75, 85, 100 2D + O
1600 x 900 8, 16, 32 120 2D
1600 x 1200 8, 16, 32 60, 75, 85 2D + O
1600 x 1200 8, 16 100 2D
1856 x 1392 8, 16, 32 60 2D + O
1856 x 1392 8, 16 75 2D
1920 x 1080 8, 16, 32 60, 75 2D + O
1920 x 1080 8, 16 85, 100 2D
1920 x 1200 8, 16, 32 60 2D + O
1920 x 1200 8, 16 75 2D
1920 x 1440 8, 16 60, 75, 85 2D
1920 x 1440 32 60 2D
2048 x 1536 8, 16 60, 75 2D
2048 x 1536 32 60 2D
Can your Dell Dimension 3000 do widescreen?
Now that's a different question altogether, the modes may be limited within the Video BIOS Table (VBT) by Dell. You might be able to override these limitations with EnTech's PowerStrip.
PowerStrip is shareware, try before you buy.