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Phil's Ultimate VGA Benchmark Database Project

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Reply 480 of 486, by ph4nt0m

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YlWvpoo.jpg

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.

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Reply 481 of 486, by GL1zdA

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Thanks for the results. It seems the 16-bit bus of the SLC2 is simply to limiting to compete with an 486. I'm curious how the VLB bus works with the 16-bit bus of the SLC2.

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Reply 482 of 486, by Anonymous Coward

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Personally, I think these stores are pretty good for what is basically a glorified 386SX.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 483 of 486, by ph4nt0m

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GL1zdA wrote:

Thanks for the results. It seems the 16-bit bus of the SLC2 is simply to limiting to compete with an 486. I'm curious how the VLB bus works with the 16-bit bus of the SLC2.

They put two PAL16L8 and one PAL16R4 logic chip to glue 32-bit VLB and 16-bit system bus. The memory controller supports fast page and block interleaving. The 128Kb L2 cache works over the entire 16Mb memory range with write back. It seems they squeezed all juice out of the 386SX architecture. OPTI 82C295 is capable of 40MHz by design. OPTI 82C283 Rev. B can do up to 33MHz according to the spec. IBM didn't do speed rating on 486SLC2. It was up to OEMs what clock speed to choose. Passive cooling was necessary for 66MHz and above.

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Reply 485 of 486, by ujav

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Tried to download zip file, but seems like Phil's site is down? Would be nice to have at least couple of mirrors for that.
In the meantime found old(?) version on archive.org: https://web.archive.org/web/20170121115809/ht … .4_jan_2017.zip

Reply 486 of 486, by Tertz

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Compared to the initial tests pack, in the current 1.4 there is a change of parameters for Quake: viewsize 120 -> 100 (120 sets complete screen view, while 100 is by default, reduces the screen by the returning of health/ammo bar). This rises on ~14% the Quake's 320x200 results in DOSBox and should significantly on real computers too.
It's not clear since what time this change has happened. The initial tests pack was uploaded in 2014-01-05 and I should be taken its link, following this theme, not before of 2015-05-09. In the pack's manual after 1.0 version dated of 2015 the next changes are said of January 2017. Probably viewsize=100 appeared since January 2017. It could happened accidentally, as 100 is Quake's default and with what people played in common, as Doom's settings in 1.4 are still left at complete screen view without health/ammo bar. So Quake's results in 320x200 inputed since some time should be reduced, for example by the devision on 1.14

ujav wrote on 2019-06-28, 23:02:

seems like Phil's site is down?

Try a proxy.

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