This thread is mostly for notes in no particular order.

For more visual info, please refer to this video: https://www.youtube.com/watch?v=OYoTgrYmmec
And here: https://www.parkytowers.me.uk/thin/wyse/vx0/WyseV90LE.shtml

General information:

CPU: Via C7 Eden 1200 MHz
Chipset: CN700/VT8237
GPU (integrated): S3 UniChrome Pro IGP
RAM: 512 Mb DDR2 533 MHz (works at 4-4-4-12 CR 2T by default)
SDD: usually comes prepackaged with 128 Mb DOM. So not enough for comfortable Windows 95/98 install.

1) Driver installation is very straight forward , since it's a VIA system. Grab VIA 4in1 driver and S3 GPU drivers are you're good to go.

2) CPU overall is comparable to Pentium III/Athlon 750 on an SDRAM system. Despite having very wide system bus (400MHz) and DDR2 memory, the memory readings aren't any better than SDRAM chipset and fluctuate around 1 Gb/s with 150ns latency. So most of the memory bandwidth is used by the GPU.

3) Pesky "Fireport" requirement to enter BIOS can be removed by setting the password as blank.

4) 3 USB ports are somewhat limiting, especially considering space constrains. Two port on IO side are located near the DVI port, so you can't put anything wide in them. Frontal port has the same issue, but due to it being to deep in the case. There are more USB ports on the motherboard, but using them would require some modding.

5) PATA controller has not issues with generic SATA converters so far, but motherboard itself is set to use storage drives in UDMA33 mode only. So any fast SSD solution is wasted here.

6) Will require 20cm 44-pin cable to comfortably fit in SATA SSD with an adapter. There's enough space near IO shield, of course if it's not some rare variation with a compact flash reader.

7) The motherboard actually has two empty SATA port placements, so it's probably possible to solder SATA support directly. Although with the first revision of 237 south bridge the choice of SSD is limited.

8 ) Analog output works in strict 60Hz for VGA modes, essentially overriding the default 70Hz. This could be both useful (if you use 60Hz LCD panel) and detrimental (if you play 70Hz timing sensitive games). According to my monitor, text mode is displayed in 1152x900 resolution. This applies to Doom Mode X too. VGA 13h is "correctly" displayed as 720x400 mode, so no issues here. Despite that, it has very crisp output for DOS.
Digital output is recognized as 1440x900. Very strict 60.0 Hz, analog can do 60.4 or some other decimal numbers. Unlike analog, everything is displayed in 1440x900 resolution, doesn't matter if it's mode X, text mode or 13h. Exotic Mode X resolutions are not properly displayed though and are cropped.

9) S3 UniChrome Pro is reasonably fast for what it is, even comparable in performance with HP T5720 (the other popular option for compact Win98 system). It has no T&L support though.

10) 237 south bridge is less optimal for DOS sound, so SBEMU is your best friend.

11) BIOS has FSB oveclocking options, but they are not applied after restart.

12) Memory can be freely used with Command Rate 1T. Other timings are somewhat tight already and changing them will most likely lead to black screen.

13) According to Quake, UniChrome has all popular VESA resolutions and then some more (like HD mode 1280x720). Which is a pleasant surprise compared to late desktop S3 cards. Quake requires vid_nopageflip to work properly in VESA modes without flickering and Build Engine games require NOLFB.

14) Quake 3 Arena scores 53 fps in 1024x768 16-bit mode with everything set to high, except bilinear filtering. Proper trilinear filtering is also supported, but very punishing in terms of performance. So I guess Unichrome Pro is also just a rebadged S3 Savage 4, but with two pixel pipes.

15) This thing runs HOT. Maybe a bit too hot to my liking. HP T5720 it is isn't.