Как я понял, для TNT2, в отличии от

Как я понял, для TNT2, в отличии от TNT биосы универсальны для обоих типов памяти, вот что пишет NVIDIA

Маркировка биосов для TNT

NV04 BIOS Distribution Files
The ROM distribution files follow this naming convention:
Chip[PROM]EncoderRAM.rom
where
Chip nv4
[PROM] l  present only if the PROM is greater than 32 KB (that is, it 
supports an 8x14 font)
Encoder bt  Brooktree TV encoders
ch  Chrontel TV encoders
RAM sd  sdram
sg  sgram
For example, a TNT BIOS for a ROM that supports an 8x14 font and uses a 
Chrontel encoder and sgram memory is Nv4lchsg.rom.

Маркировка биосов для TNT2

NV05 BIOS Distribution Files
The ROM distribution files follow this naming convention:
[TV]ChipEncoder.rom
where
[TV] sm  present only if the BIOS does not support TV or flat panel
Chip vanta, m64, nv5, nv5pro, or ultra
Encoder bt  Brooktree TV encoders
ch  Chrontel TV encoders
ph  Philips TV encoders
For example, a TNT2 BIOS for a ROM using Chrontel is nv5chr.rom. A 
TNT2 Model 64 BIOS with no TV or flat panel support is smm64.rom.