Single sided 12MB?STB cards are reference designs, right?

I thought all reference cards with memory only on the front were 8MB, 12MB needed the 4MB bank on the rear of the card to be populated.

paradigital wrote on 2021-08-30, 08:52:

Single sided 12MB?STB cards are reference designs, right?

I thought all reference cards with memory only on the front were 8MB, 12MB needed the 4MB bank on the rear of the card to be populated.

Yes, there are, with 1MB memory ICs:
https://vgamuseum.ru/gpu/3dfx/3dfx-v2-1000-pc … oodoo-ii-12-mb/

Getting back to the OP's question, I've never tested such a combination of single/dual sided Voodoo 2 cards in SLI.
It might be a general incompatibility, but it could also be something specific to your build.
But, you know, 3dfx probably had their reasons why their official drivers didn't allow SLI with different Voodoo 2 models. Btw, does the official driver actually detect SLI (since both are STB)?

bloodem wrote on 2021-08-30, 09:04:

Yes, there are, with 1MB memory ICs: https://vgamuseum.ru/gpu/3dfx/3dfx-v2-1000-pc … oodoo-ii-12-mb/ […]
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paradigital wrote on 2021-08-30, 08:52:

Single sided 12MB?STB cards are reference designs, right?

I thought all reference cards with memory only on the front were 8MB, 12MB needed the 4MB bank on the rear of the card to be populated.

Yes, there are, with 1MB memory ICs:
https://vgamuseum.ru/gpu/3dfx/3dfx-v2-1000-pc … oodoo-ii-12-mb/

Getting back to the OP's question, I've never tested such a combination of single/dual sided Voodoo 2 cards in SLI.
It might be a general incompatibility, but it could also be something specific to your build.
But, you know, 3dfx probably had their reasons why their official drivers didn't allow SLI with different Voodoo 2 models. Btw, does the official driver actually detect SLI (since both are STB)?

Yes with the latest 3dfx reference drivers SLI is detected in the control panel. The STB cards are all reference design to my knowledge as they were all produced under 3Dfx directly.

Got it working. Went to the registry and cleared out the entire Software -> 3dfx branch where the card environment settings are set. Some setting in there worked prior but not with my SLI setup. Heck the thing even runs with the 3dfx reference driver. So the memory differences did not seem the make a difference after all.

Edit: Did some further testing and this variable is what was causing the lock up. "SSTV2_FASTPCIRD" It apparently enabled fast PCI reads, but in this case it seems like it was causing some sort of timing issue.

Good to know! Glad you got them working. 😀