Reply 480 of 495, by ph4nt0m
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The IBM Opal and Opal LX mainboards with IBM 486SLC2
AMI BIOS 06-Jun-1992, MS-DOS 6.22 with HIMEM
IBM Opal with 80MHz CPU / 40MHz system and VL buses / 13MHz ISA bus, OPTI 82C295 + 82C206 chipset, 16Kb WB L1 cache, 128Kb WB L2 cache, 16Mb FPM RAM, IIT 3C87SX math coprocessor, Hercules VL Dynamite Pro 2Mb (Tseng ET4000/W32P):
3Dbench: 40.0
PCPbench: 7.9
DOOM: 22.0 (3395 realticks)
Quake: 2.1
The same config with a Diamond SpeedStar 64 ISA 2Mb (Cirrus Logic GD5434):
3Dbench: 33.3
PCPbench: 7.4
Doom: 20.0 (3743)
Quake: 2.1
Again with the Diamond card and 66MHz CPU / 33MHz system bus / 11MHz ISA bus:
3Dbench: 27.8
PCPbench: 6.2
Doom: 16.8 (4450)
Quake: 1.8
IBM Opal LX with 66MHz CPU / 33MHz system bus / 11MHz ISA bus, OPTI 82C283 + 82C206 chipset, 16Kb WB L1 cache, no L2 cache, 16Mb FPM RAM, IIT 3C87SX math coprocessor, Diamond SpeedStar 64 ISA 2Mb:
3Dbench: 26.7
PCPbench: 6.1
Doom: 15.0 (4978)
Quake: 1.7
The same with 50MHz CPU / 25MHz system bus / 8MHz ISA bus:
3Dbench: 20.0
PCPbench: 4.8
Doom: 12.0 (6205)
Quake: 1.3
It seems the L2 cache doesn't help much. The max improvement is 10% with Doom. A video card upgrade from ISA to VL yields 20% in 3Dbench and 10% in Doom.
BTW if anyone has the MR BIOS for these mainboards, I'd appreciate a copy.