NVIDIA has a link to their TNT2 M64 page but unfortunately that page consists of a lot of white nothingness. Assuming the TNT2 M64 is a TNT2 chip with a 64bit memory bus as has been explained, then we can recycle the TNT2's specifications as we do here:
3D/2D Acceleration
125MHz core clock speed
150MHz memory clock speed
32MB SDRAM (7ns)
64bit memory path (as opposed to 128bit on a regular TNT2)
Second-generation TwiN texel 32-bit graphics pipeline
100% hardware triangle setup
Optimized for Direct3D acceleration with full support for DirectX6.0
32-bit ARGB rendering with destination alpha
24-bit Z-buffer, 8-bit stencil buffer
Anisotropic filtering (better than Tri-linear MIP-mapping)
Per pixel perspective correct texture mapping including Fog, Light, and MIP-mapping
High performance 128-bit 2D/GUI/DirectDraw acceleration
Video Acceleration
Hardware YUV 4:2:2 and 4:2:0 color space conversion support
Multi-tap X and Y filtering
Support planar YUV12 (4:2:0) to/from packed (4:2:2) conversion for software MPEG acceleration
DVD sub-picture alpha blended compositing
Video acceleration for DirectShow, MPEG-2 and MPEG-1
AGP 4X Sideband Support
AGP 4X/2X/1X mode with full sideband/Execute mode support
Supports over 900MB/sec in AGP 4X mode
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