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From: jon@robots.ox.ac.uk (Jon Tombs)
Newsgroups: comp.unix.bsd,comp.os.linux,comp.unix.pc-clone.32bit
Subject: Re: ET4000/W32 and VESA VL-Bus
Message-ID: <1992Dec28.103211.12677@diomedes.robots.ox.ac.uk>
Date: 28 Dec 92 10:32:11 GMT
References: <1992Dec17.190542.2662@utagraph.uta.edu>> <1992Dec18.095906.3950@Informatik.TU-Muenchen.DE> <1hloneINNfnn@cbl.umd.edu>
Organization: Robotics Research Group, Engineering Science Dept, Oxford, UK.
Lines: 48
Originator: jon@diomedes.robots
In article <1hloneINNfnn@cbl.umd.edu> mike@starburst.umd.edu (Michael F. Santangelo) writes:
>>Also there are quite a number of S3 chips, which use EITHER VRAM or
>>DRAM:
>
>> 86C911 VRAM
>> 86C924 VRAM
>> 86C801 DRAM
>> 86C805 DRAM
>> 86C928 VRAM
>
>
>>What I am saying is that for 1028x768 in 70Hz and 1280x1024 you should
>>generally forget the DRAM based solutions. Even if they look good at
>>benchmarks; most of these benchmarks used a 640x480 resolution,
>>where the screen refresh only takes 25MB/sec, and the available
>>bandwidth for graphics operations is quite the same as for VRAM based
>>solutions. But if you use the DRAM based boards at 1024x768, 70Hz,
>>you'll see the difference.
The 801 is indeed DRAM based (60ns DRAM), For the 911 and 801 boards both
for 71Hz refresh at 1024x768 on a 13MHz ISA bus I get:
70MHz S3 911 (Actix GraphicsEngine70)
TOTAL 103781 lineStones
TOTAL 21777 fillStones
TOTAL 16997 blitStones
TOTAL 2580416 arcStones
TOTAL 83875 textStones
TOTAL 46797 complexStones
TOTAL 37496 xStones
S3 801 (Actix GraphicsEngine32)
TOTAL 107908 lineStones
TOTAL 42632 fillStones
TOTAL 31590 blitStones
TOTAL 2975512 arcStones
TOTAL 117562 textStones
TOTAL 92352 complexStones
TOTAL 64061 xStones
When I get back from holiday I'll repeat the benchmarks at several
different clock speeds and resolutions. Possibly the 801 will be faster
at lower clock speed/resolutions, but it is still thrashing the VRAM based
Actix GraphicsEngine70, which was the fastest 911 based card I found.
--
Jon <jon@robots.ox.ac.uk> (for a .vacation fortune)
"I got in today just as the sun was crashing"