A lot of early VLB chipsets allow installing 2MB of RAM, but few actually use it for anything sensible - the CL-GD5428 is famous for just adding two nasty interlaced modes if you upgrade.

So, with a bit of luck I'll soon be getting a DFI WG-6000VL with 1024kB onboard and sockets for 1024kB more. Question is: what would happen if I fill those extra sockets with 44256 DRAMs?

The datasheet:
http://www.vgamuseum.info/index.php/cpu/item/ … 8f0301b336cd79d

Relevant (but not very verbose) bits:

Supports up to: -1024 by 768 with 256 color • 800 by 600 with 64 colors -640 by 480 by 64K color -640 by 480 with 16 million col […]
Show full quote

Supports up to:
-1024 by 768 with 256 color
• 800 by 600 with 64 colors
-640 by 480 by 64K color
-640 by 480 with 16 million color
-1280 by 1024 with 256 color Interlaced

So no extra 2MB modes, apart from the 1280x1024x8b interlaced that would require 1.25MB. 1024x768x16b or 800x600x16b seems out of the question.

[...]

The WD90C33 supports all standard IBM VGA modes with only one 256K by 16 DRAM. Because It uses a 32-Bit memory interface and has an internal write buffer, the WD90C33 can update the video memory without Inserting walt states to the AT bus for most standard IBM VGA modes.

When additional DRAMs are Installed the WD90C33 is capable of supporting high resolution color video modes (1024 by 768 with 256 colors, non-interlaced at 72 Hz vertical refresh rate).

No nice table showing memory config vs resolution/refresh rate. It's clear that 256kBx16 (i.e. 512kB) isn't enough for 1024x768x8b at any refresh rate, but that still doesn't tell us what is different at 1MB vs 2MB. There's also no mention of interleaving in the datatsheet.

Anyone have an idea?