Cut and pasted from across the web, a TNT2 is _really_ that slow compaired to some of the newer cards out there. It was really good, but it really is a bit slow most modern 3d applicaions.
official specs on the final revision of nVidia’s Riva TNT2 are listed below:
* 125MHz – 150+MHz 128-bit 2D/3D core
* 2nd Generation 128-bit TwiN Texel architecture
* 300 Megapixels per second
* 9 Million Triangles per second peak processing power
* Resolution support up to 2046 x 1536
* PCI/AGP Support – AGP 2X/4X Texturing Support
* 16/32-bit 3D Rendering Support
* 32-bit Z/stencil Buffer
* 300MHz Integrated RAMDAC
* 16/32MB SDRAM
* 2048 x 2048
* Texture Support Optional NTSC/PAL Video Out
* Optional Digital Flat Panel Output
* Direct3D/OpenGL API Support
* OpenGL ICD for Windows 9x, NT 3.5x, NT 4.0, and Windows 2000
Geforce2
* nVidia GeForce-2 MX
* 32MB 128-bit SDRAM
* Integrated 350MHz RAMDAC
* Resolution up to 2048x1536, True Color @ 60Hz
* 175MHz core,166MHz SDRAM clock
* 2 Dual-Texturing Pipelines
* 4 Texels per Clock HyperTexel-Architecture
* 350 MegaPixel, 700-MegaTexel Fill Rate
* 20M Triangles/sec Hardware Transform and Lighting
* 4X AGP with Fast Writes/AGP 2x/1x compatible
* Hardware Acceleration for Microsoft DirectX 7.x, DirectX 8, and OpenGL 1.2 ICD
* DirectX Texture Compression Support
* NTSC/PAL TV-Output with flicker filter
* Digital TwinView Display Architecture for Simultaneous Dual Display
Geforce 4 MX
Specifications of the MX480
• MX440-8X (NV18) chipset
• AGP 8x
• Memory interface 64MB DDR
• Memory bus 128bit
• GPU clock speed 275 MHz
• Memory clock speed 512 MHz
• Memory Bandwidth 8.2 GB/sec
• Fill Rate (texel/sec) 1.1 billion
concentrate mainly on the 300 million texture pixles per second for the tnt2, 700 million for the geforce 2 and 1.1 billion for the geforce 4 MX. Figgure in also the fact that the triangles per second ramp up significantly as well and its easy to see that if you are rendering an image with lots of polygons, things slow down a lot compaired to modern hardware. For N64 emulation I really would be hard pressed to run a GPU slower than a Geforce 2 unless I was willing to live with stutteringly slow frame rates from time to time.
also what things don't say is that the geforce 4 is a 5th generation of the basic archetecture of the tnt while the tnt2 is second generation. if it runs on the tnt or tnt2 it will run way faster on the later cards