NV18 & NV28: NVIDIA Chips with AGP-8x Flavor

Introduction, Continued

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Header Cell - Column 0 NVIDIAGeForce4 Ti4200NVIDIAGeForce4 Ti4200-8xNVIDIAGeForce4 MX440NVIDIAGeForce4 MX440-8xATI Radeon 9000 Pro
Chip Technology256-bit256-bit256-bit256-bit256-bit
Process0.15 Micron0.15 Micron0.15 Micron0.15 Micron0.15 Micron
Transistors63 Mio63 Mio---
Memory Bus128-bit DDR128-bit DDR128-bit DDR128-bit DDR128-bit DDR
Memory Bandwidth8,2 GB/s8,2 GB/s8,8 GB/s8,8 GB/s8,8 GB/s
AGP Bus1x/2x/4x1x/2x/4x/8x1x/2x/4x1x/2x/4x/8x1x/2x/4x/8x
Memory64/128 MB64/128 MB64 MB64 MB64/128 MB
GPU Clock250 MHz250 MHz270 MHz275 MHz275 MHz
Memory Clock(514/500) MHz 64 MB(444) MHz 128 MB(514) MHzOfficial: 500 MHz200 (400) MHz256 (512) MHzOfficial: 500 MHzMHz 275 (550) MHz
SpeicherSD/BGA 3,3-4nsSD/BGA 3,3-4nsSD 4-5nsBGA 3,6nsSD
Vertex Shader22--2
Pixel Pipelines44224
Texture Units Per Pipe22221
Textures per Texture Unit44446
Vertex S. Version1.11.1--1.1
Pixel S. Version1.31.3--1.4
DirectX Generation887.17.18.1
FSAA ModiMultiSamplingMultiSamplingMultiSamplingMultiSamplingSuperSampling
Memory OptmizationsLMA IILMA IILMA IILMA IIHyper Z II
Display Outputs22222
Chip Internal Ramdacs2 x 400 MHz2 x 400 MHz2 x 400 MHz2 x 400 MHz2 x 400 MHz
Chip External Ramdacs-----
Bits per Color Channel88888
Special--TV Encoder On-ChipTV Encoder On-ChipTV Encoder On-ChipFullStream

Now we're sure there are some readers out there mournfully looking at their now "outdated" AGP 4x system. But is the twofold increase in speed really necessary, not to mention - tangible? To be blunt: no. Even future applications are unlikely to require a bus interface that is faster than AGP 4x. 8x is more of a future investment than a current requirement.

AGP 8x uses pins that were previously unused. Visually, there is no difference to the 4x connector.

While AGP 4x with its 266 MHz offers a maximum theoretical bandwidth of about 1.1 GB/s, 8x allows for twice as much data to be pushed across the bus, namely 2.1 GB/s. Additionally, there are now several new side-band addressing modes as well as an "isochronous operation" mode, which ensures maximum available bandwidth regardless of system load. This could prove a very valuable addition for video streaming and similar applications. Games, however, aren't nearly as demanding, making this a moot point for gamers.