Time for another meaningless roundup, I have some vlb boards:
Asus VL/I-486SVGO rev 1.2: the cheap sister of 486SVGOX4 which lacks the 3.3v cpu mosfets unlucky and it has support for 30 and 72 simm memory
Asus VL/I-486SV2G rev 1.5: very same model as the other but a more recent revision, not one of the latest unlucky, still lacks the v3.3 cpus support and since it is a more recent version the old 30 pin dimm sockets have been removed, more space for 72 pin simm.
QDI V4P895P3/SMT V5.0: A very late opti chipset which supports the newer socket 3 cpus, unlucky it goes only up to 512kb (single banked) cache and it is a mess with jumpers also the manual is quite confusing, it supports v3.3 cpus! It uses the infamous ami windows like bios.
PCChips M912 rev 1.4: yeah pc cheap stuff, soldered cache (not fake), soldered bios, UMC UM8498/8496, doesn't support v3.3 cpus. This also use the ami windows like bios.
FIC 486-VIP-IO: jack of all trades it has 2 vlb slots, isa and pci furthermore it has integrated ide controller like later pci socket 3 boards, too bad it's plagued from a bugged bios also despite what it says it doesn't support 1mb of cache.

Since I read several times that the vlb configuration should have the dx2 66 mhz cpu which is also the fastest 5v cpu I have, I'm going for this. I also have some vlb videocards and I tested them prior to check which was the faster, I decided to go with CL-GD4828 vga and 8mb of ram single stick, cache change from model to model due to the max supported amount. Where the settings were available the vl bus was used with 0 wait states and bus frequency <=33 mhz, to achieve the highest performance, it has been used the vlb slot farthest from the cpu to avoid any signal issue.

The cache amount is the following:

1Asus VL/I-486SVG0 rev 1.2: 256kb
2Asus VL/I-486SV2G rev 1.5: 1024kb
3QDI V4P895P3/SMT V5.0: 256kb
4PCChips M912 rev 1.4: 128kb
5FIC 486-VIP-IO: 512kb

Let's begin with memory and cache performance, I used CACHECHK and value are the mb\s:

Did I mention that FIC board has a very awful bios? Changing that simple option in bios settings change the memory result quite a bit.
But how those differences are rflected in games?

Let's see:

First thing: many results are the same, this means that the cpu is clearly a bottleneck and vlb vga could reach higher performance with a more powerful cpu. That was also reflected to a previous (unpublished round up with several pci video cards).

Differences between asus boards are I think due to the very different amount of cache installed since the memory\cache bandwidth was the very same.
The PC chip board shows higher results in a couple benchmarks (doom and 3dbench 1.0c) but also lower results in others.
Sis and UMC were the 2 contenders of the "best" 486 era chipsets this time, like with the pci boards the Sis seems a bit faster overall.
I had great hopes for the Opti chipset, mainly because it was later arrival than sis and umc, I must say I'm somewhat disappointed but the main pro is the v3.3 cpu with is a plus.
FIC 486-VIP-IO: after the shameful memory results I had no great hopes for this board, other than this one also supports v3.3 cpus thanks to a modification, but I think it's not worth the hassle, until someone take care of fixing the bios (if it is even possible), the lower results are imho due to the flaky ram perfomance. Weird enough the highest memory settings doesn't reflect in better perfomance, so the WB setting in memory bios should be kept enabled.