Have only one G450 so cannot tell. Do have a few G200 and it does seem to share same memory bandwidth with 8 or 16Mb. so as I said I do not know ;p

16Mb and 32Mb SDRAM versions use different chips. 16Mb has more pins and is equal in data width to SGRAM cards with 2 chips, which are 64 bit. Difference is DOS test could be a result of bank interleaving.

W.x. wrote on 2022-10-12, 20:58:

I have both versions, Matrox G450 16MB and 32MB, and 16MB has only half of memory slots. I have feeling, that it has also halved […]
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I have both versions, Matrox G450 16MB and 32MB, and 16MB has only half of memory slots. I have feeling, that it has also halved memory bus width.

they are versions
G45+ MDHA16DLE
G45+ MDHA32DB
just exactly same as on Vgamuseum
http://vgamuseum.info/index.php/f-naq/item/21 … millennium-g450

Just ran System Analyzer from Hirens Boot, where is also Video Memory speed test. (you will find it under DOS->System info tools-> System Analyser)

The 16MB version got 33 MB/sec on 32-bit transfers.
But 32MB version got around 67 MB/sec on 32-bit transfers

Anyone can confirm it, that 16MB has also halved memory width? (same situation is with some Ati Rage 128 Pro and Ultra cards... usually, when half of memory slots is not populated, it's 64-bit instead 128-bit).

I always assumed that the G450 had 64-bit DDR memory interface, the 128-bit SGRAM had an older G400, isn´t it true?

Seems , you're right, under DOS, it's not reliable. I've tested MX200 and MX400, and they have same 32-bit transfers. Even test of VRAM under Memory Stress Test on Hirens takes the same time. One has 64-bit SDR memory, and one has 128-bit SDR memory, so they should have different bandwidth. I've tested it under GLQuake, and indeed, MX400 had much more performance than MX200 (i've set clocks at 175/166 on both). It was around 72fps (MX200) and above 100fps (dont remember exact number, but it was much more for MX400). But under that System Analyzer, both cards had same 75MB/sec.

The Serpent Rider wrote on 2022-10-13, 02:12:

16Mb and 32Mb SDRAM versions use different chips. 16Mb has more pins and is equal in data width to SGRAM cards with 2 chips, which are 64 bit. Difference is DOS test could be a result of bank interleaving.

Hello there, found out, the wider memory chips should be still DDR, not SGRAM. 64-bit memory bus (so same bandwith as G400 with 128-bit memory bus).

The question is:
How differ versions with wide and thin memory chips. Are they same performance vice? Here are pictures:
https://www.vgamuseum.info/index.php/cpu/item … millennium-g450

Are they both DDR SDRAM? Someone told me, thiner ones are common SDRAM. I don't have that feeling, because this way, with 64-bit memory bus, it would be too slow.
If they are both DDR SDRAM, why they used wide memory chips on one card, and thin on another version? (Is there any special reason? Or only spacing on PCB?)

DDR can be both SGRAM and SDRAM. Big chips are SGRAM.

The Serpent Rider wrote on 2023-07-19, 20:59:

DDR can be both SGRAM and SDRAM. Big chips are SGRAM.

Ty. Any performance differences, do you predict? (at same clocks)

SGRAM is slightly better.