First post, by jheronimus
- Rank
- Oldbie
Hi, all
Got myself an AOpen Vi15G motherboard (SIS471 chipset, VLB) with the purpose of running AMD 5x86 at 133. I've used the jumper settings from here to set the board up (specifically, the "misc 5x86" option from there). However, it feels like I did not set the motherboard properly.
CHKCPU tells me that 5x86 is running at 3x33 (not 4x33).
System Information identifies the chip as Cyrix 486 @ 88 MHz with the index of 132.3
Doom timedemo gives me about 28FPS (2134 gametics/2627 realtics)
Speedsys identifies the chip as AMD Am486DX4 @ 100 MHz with the index of 35.29
3DBench: 51.1
Chris's Bench: 53.8
Doom result is particularly weird. Even if my 5x86 is working as DX4-100, shouldn't I get at least 40 FPS?
The other specs are:
256KB L2 cache
4x4MB RAM
Cirrus Logic CL-GD5428 with 2MB VRAM
BIOS version R2.30
Still, I'm guessing, maybe those "Misc 5x86" settings hosted by AOpen are for Cyrix 5x86 (uses 3x multiplier), so maybe I just need to somehow switch to 2x which 5x86 should recognise as 4x? How do I do that? TH99 and AOpen don't show explicit settings for clock multiplier.
If anyone has any other documentation (and maybe a newer BIOS file), I would be very grateful. I also have issues with front panel connectors — looks like the TH99 has it all wrong (or I have a different revision).