First post, by noshutdown
the board in question is the same model as this thread, just another one which is NOT corroded by the leaked battery:
please identify: unknown typical generic 386dx board
as you can see the board has amd386dx-40 cpu and opti 82c495 chipset. it comes with 4 ISSI IS61C256AH-20H sram and a winbond W2465AK-15 tag ram, so it should have 128k of cache right? in bios i set a conservative 3-2-2-2 cache timing and 1wait dram, which not the fastest setting but should be by default for 40mhz, but all benchmarks performed very slowly:
3dbench at 12.5fps(~15fps is up to standard)
norton sysinfo reported 31.2 units while the reference 386dx-33 is 36 units
both cachechk and cct386 reported 32kb of cache, cachechk's cache speed is ~47us/kb, and dram is ~115us/kb.
speedsys freezes at extended memory test, it reported a ~22.5mb memory bandwidth at topleft though.
in contrast, another board with micronics mx83c306 chipset, which has only 8kb of cache, scored 14.5fps in 3dbench and i heard other people's boards with amd386dx-40 scoring ~16fps, so this opti board is obviously performing badly.
could it be faked(remarked) cache chips, or that the bios is stupidly bugged that its not setting the chipset up correctly? there is a "cacheable range" option in bios, and it says should not exceed the actual onboard dram size, so i choose 16mb.