Cards' stats. and fillrate/shading power
Let's take a look at the cards' basic vital statistics.| Card | Leadtek GeForce 7800 GTX Extreme | NVIDIA reference 7800 GTX | XFX GeForce 7800 GT | GeForce 6800 Ultra | SAPPHIRE RADEON X1800 XT | SAPPHIRE RADEON X1800 XL | ATI RADEON X850 XT |
| Manufacturing process | 110nm | 110nm | 110nm | 130nm | 90nm | 90nm | 130nm |
| Interface/speed | PCI-Express | PCI-Express | PCI-Express | PCI-Express | PCI-Express | PCI-Express | PCI-Express | Onboard memory | 256MB | 256MB | 256MB | 256MB | 512MB | 256MB | 256MB | Core speed | 490MHz | 430MHz | 450MHz | 425MHz | 625MHz | 500MHz | 540MHz | Rendering pipelines | 24 | 24 | 20 | 16 | 16 | 16 | 16 | Fillrate (multi-texturing) | 11.76GTexels/s | 10.32GTexels/s | 9GTexels/s | 6.8GTexels/s | 10GTexels/s | 8GTexels/s | 8.64GTexels/s | Vertex shading units | 8 | 8 | 7 | 6 | 8 | 8 | 6 | Shader Model | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 2.0b | Memory interface | 256-bit | 256-bit | 256-bit | 256-bit | 256-bit | 256-bit | 256-bit | Memory speed | 1250MHz | 1200MHz | 1050MHz | 1100MHz | 1500MHz | 1000MHz | 1080MHz | Memory bandwidth (max) | 40GB/s | 38.4GB/s | 33.6GB/s | 35.2GB/s | 48GB/s | 32GB/s | 33.75GB/s | Cheapest online price | £385 | £329 | £275 | £299 | £389 | £275 | £229 |
Let's see how the numbers above stack-up against 3DMark05's fillrate and shading tests.
24 rendering pipelines and a core approaching almost 500MHz gives the Leadtek PX7800 GTX a healthy lead in both single- and multi-texturing fillrate tests. What about shading power, though?
Pixel shading follows on from the fillrate tests, with NVIDIA's G70-based cards well ahead.
The SAPPHIRE RADEON X1800 XT 512MB card monsters 3DMark05's vertex shading tests, opening up an intriguing battle in the upcoming benchmarks.