GeForce 6800 GT PCI Express
Posted by Hilbert Hagedoorn on: 07/21/2004 06:00 AM [ 0 comment(s) ]
Let me explain briefly what happens in the pipeline for you to understand its importance, each pixel that is rendered on your screen goes through a pipe where it'll receive its complex color/effect etc. Each time that pixel is altered it'll pass through the pixel pipeline, one pass is one clock cycle. You can imagine going from 8 to 16 pipes can bring you a dramatic performance increase. I have to note here that these are not theoretical pipelines as rumored by some websites prior to the product announcements. They are scalable though, each pipe is available at any time in sets of 4. Where NV35 was stereotyped as 4x2/8x0 architecture, the NV40 is 16x1/32x0.
Architecture Characteristics of the GeForce 6 Series
- Pixel pipelines: 16
- Superscalar shader: Yes
- Pixel shader operations/pixel: 8
- Pixel shader operations/clock: 128
- Pixel shader precision: 32 bits
- Single texture pixels/clock: 16
- Dual texture pixels/clock: 8
- Adaptive Anisotropic Filtering: Yes
- Z-stencil pixels/clock: 32
The silicon itself is of course PCI-Express ready yet the one we are talking about is running internally on AGP 16x. PCI-Express has double the bandwidth of AGP8x and another plus; it allows data to be sent in both directions.
I know AGP 16x might sound a bit weird, but I was told by an NVIDIA representative that the GPU can actually handle AGP 16x internally at the core level. The 6800 Ultra is equipped with the latest available in affordable yet really fast GDD3 memory; on the 6800 Ultra it is running at 1.2 GHz (2x600 MHz), whereas today's product, the GT, is running at 1 GHz (2x500 MHz). BTW GDDR3 is designed in a way that its temperature is much cooler. It's likely we are going to see manufacturers making 6800 cards without ramsinks.
- 222 Million transistors
- 350 MHz Core Clock
- 500 MHz memory Clock
- 256-bit GDDR3 memory
To tidy things up a bit I've made a little overview
- 16 pipeline GPU architecture (12 on 6800 Non Ultra).
- Up-to 8x more shading performance compared to the previous generation
- CineFX 3.0 engine - Yes indeed... DirectX Shaders model 3.0 for really nice visual effects
- On Chip Video processor.
- DDR3 memory on a 256-bit Memory interface @ 1 GHz
- UltraShadow II technology - Doom III; need I say more? Very well then... 3x to 4x faster than NV35 !
- High Precision Dynamic Range (HPDR) technology - we'll discuss this later in the article
- 128-studio precision through the entire pipeline - 32-bit Color precision; this time with nice performance.
- IntelliSample 3.0 Technology - 16x Anisotropic Filtering & Rotating Grid Antialiasing
- Full MPEG encoding and decoding at GPU level !
- Advanced Adaptive De-Interlacing
- Video Scaling and Filtering - HQ filtering techniques including HDTV resolutions
- Integrated TV Encoder - TV-output up-to 1028x768 resolutions
- OpenGL 1.5 Optimizations and support
- DVC 3.0 (Digital Vibrance Control)
- Dual 400 MHz RAMDACs which support QXGA displays up-to 2048x1536 @ 85 Hz
- Dual DVI
|Specs||GeForce 6800||GeForce 6800 GT||GeForce 6800 Ultra|
|Process, GPU maker||130nm, IBM|
|Core clock||Up to 400 MHz||350MHz||400-450 MHz|
|Memory||128MB DDR1||256MB GDDR3||256MB GDDR3|
|Memory clock||2 x 550MHz||2 x 500MHz||2 x 600MHz|
|FP operations||FP16, FP32|
|Pixel shaders||PS 3.0|
|Vertex shaders||VS 3.0|
In this article we review the ASUS GeForce GTX 670 DirectCU Mini edition, a compact performance graphics card designed primarily for small form factor PCs with mini ITX motherboards. The dual-slot card measures just 17cm and features the NVIDIA GTX 670 GPU. ASUS has re-engineered the DirectCU cooler to fit small form factor cases. While shorter, it introduces a copper vapor chamber placed directly on top of the GPU for faster heat spreading and dispersal with 20% lower temperatures than reference GTX 670.
MSI GeForce GTX 650 Ti BOOST OC review
In this article we review the MSI GeForce GTX 650 Ti BOOST OC edition review with that OC for a factory tweak. The product is customized with a new PCB, cooling and a few tweaks, it has 2GB of memory with both that memory and the core base-clock slightly overclocked. Overall an interesting product at an interesting price in the lower segment of the mainstream market.
EVGA GeForce GTX 650 Ti Boost SC edition review
In this article we review the EVGA GeForce GTX 650 Ti Boost SC edition review with that SC for superclocked. The product is fairly reference looking but does come with EVGA's own styled cooler, it has 2GB of memory with both that memory and the core baseclock slightly overclocked quite significant.
Palit GeForce GTX 650 Ti Boost OC edition review
For this review we test and benchmark the Palit GeForce GTX 650 Ti Boost OC edition. The product comes customized with their own PCB design, a dual-fan cooler, 2GB of memory with both that memory and the core baseclock slightly overclocked.