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Home » Video
ATI Radeon X1000 Series
Author: Gabriel Torres
Type: Articles Last Updated: October 5, 2005
Page: 2 of 5
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Buy.com: $167.17

Radeon X1800 Family

 Architecture

Radeon X1800 family architecture can be seen on Figure 2.

ATI Radeon X1000 Series
click to enlarge
Figure 2: Radeon X1800 family architecture.

In summary it has:

  • 16 pixel shaders processors;
  • 8 vertex shaders processors;
  • 16 texture address units;
  • 16 texture units;
  • 16 render back-end units;
  • 16 z compare units.

On Figure 3 you can see how a pixel shader unit looks like inside.

ATI Radeon X1000 Series
click to enlarge
Figure 3: Inside a Radeon X1800 pixel shader unit.

Chips from Radeon X1800 family use a 512-bit ring bus memory controller. Actually this controller uses two separated 256-bit datapaths, running in opposite directions. The memory controller architecture can be seen on Figure 4. Obviously the idea behind enhancing the memory controller is to make it faster to deliver data. It does that by prioritizing memory requests according to the client that asked for it. According to ATI, this change in architecture benefits basically high-bandwidth situations, like when you have your video settings at resolutions from 1600 x 1200 up, anti-aliasing at 4x  and up and anisotropic filtering at 8x and up.

ATI Radeon X1000 Series
click to enlarge
Figure 4: Ring bus memory controller.

Models

Two Radeon X1800 models were announced: Radeon X1800 XT (formerly known by its codename, R520) and Radeon X1800 XL. While Radeon X1800 XL is being launched today, Radeon X1800 XT will be only released on November 5th, 2005.

ATI Radeon X1800 XT
click to enlarge
Figure 5: Radeon X1800 XT.

The main features for these chips are shown on the table below.

Model

Clock

Memory Clock

Suggested Price

Availability

Radeon X1800 XT

625 MHz

1.5 GHz

USD 499 (256 MB) and USD 549 (512 MB)

Nov 05th, 2005

Radeon X1800 XL

500 MHz 

1 GHz 

USD 449 (256 MB)

Oct 05th, 2005

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