ATI Radeon HD 2400 XT 256MB



As numerous reviews and benchmarks have shown, the highly anticipated ATI Radeon HD 2900 XT (R600) has not been the world-beater that some enthusiasts have been hoping for. With NVIDIA dominating the fledgling DirectX 10 scene so far, having a decently competitive ATI for balance's sake is probably a good thing. However, given the complex architecture of the R600 and the constraints imposed by its 80nm manufacturing process, going directly against NVIDIA's extravagant but powerful GeForce 8800 Ultra is foolhardy and unlikely to be successful. Hence, ATI has been forced to concede the performance crown for now and has targeted the more manageable GeForce 8800 GTS instead with the Radeon HD 2900 XT.

While there will be no doubt some loss of prestige and brand awareness as a result of not obtaining the pole position, yet as analysts will tell you, the high-end is usually not where the majority of the profits are derived. It is the mainstream cards that will be found in more systems, particularly from the big OEM builders. More importantly, with the rapid growth of the notebook segment (with a corresponding slowdown of the desktop PC market), it is the mobile versions of these mainstream SKUs that are usually featured in notebooks. In short, the money is in the potentially huge volume of the mainstream segment, for both desktop and mobile versions.

This is the focus of today's article, where we have managed to get our hands on a budget Radeon HD 2400 XT from PowerColor for benchmarking. Representing the 'pinnacle' of the low end DirectX 10 series (Radeon HD 2400 series includes a slower Radeon HD 2400 PRO) from ATI, this graphics card will be available shortly (practically all the major graphics vendors had them on display at the recent Computex 2007) and already there have been sightings of these cards on the Internet. Based on a 65nm process, the GPU of Radeon HD 2400 XT uses a RV610 core with a relatively modest (by modern GPU standards) transistor count of 180 million. The main characteristics of ATI's current DirectX 10 graphics architecture are all present, with features like Avivo HD technology, integrated HD audio controller, HDCP and HDMI support, a hardware tessellation unit and new anti-aliasing modes. You can refer to our article on the R600 for more architectural details, as they are mostly similar for all the Radeon HD series.

PowerColor sent us its Radeon HD 2400 XT in a plain vanilla box with no frills. However, there will be two editions of the XT for retail though both should have a similar box art like this.

What it does not have is the distinctive ring bus memory architecture; ATI has replaced this with a suitably low-end traditional 64-bit memory bus that may put it at a slight bandwidth disadvantage against NVIDIA's typically128-bit memory bus based cards in the upper range of the entry-level GeForce 8 cards like the GeForce 8500. The general-purpose stream processors are drastically reduced in number compared to the high-end Radeon HD 2900 series, only 40 instead of 320. Memory frequencies are also expectedly lower, with our Radeon HD 2400 XT card clocking 1400MHz DDR and using DDR3 chips. Naturally, with its smaller core and transistor count, power consumption is rated far lower than the Radeon HD 2900 XT at a very nice 25W. Below is a summary of the specifications of the Radeon HD 2400 XT as compared to some current and older competing products (which will be included in our benchmarks later).

Comparing the Radeon HD 2400 XT 256MB
GPU/VPU ATI Radeon HD 2400 XT 256MB NVIDIA GeForce 8500 GT 256MB Radeon X1650 PRO 256MB Radeon X1300 XT 256MB
Core Code RV610 G86 RV530 RV530
Transistor Count 180 million 210 million 157 million 157 million
Manufacturing Process (microns) 0.065 0.08 0.09 0.09
Core Clock 700MHz 450MHz 600MHz 500MHz
Vertex Shader Pipelines 8 Shader Processors (consisting of 40 Stream Processing Units in total) 16 Stream Processors 5 5
Rendering (Pixel) Pipelines 12 12
Shader Processor Clock 700MHz 900MHz 600MHz 500MHz
Texture Mapping Units (TMU) or Texture Filtering (TF) units 4 8 4 4
Raster Operator units (ROP) 4 8 4 4
Memory Clock 700MHz (1400MHz DDR3) 400MHz (800MHz DDR2) 700MHz (1400MHz DDR3) 340MHz (680MHz DDR3)
DDR Memory Bus 64-bit 128-bit 128-bit 128-bit
Memory Bandwidth 11.2GB/s 12.8GB/s 22.4GB/s 10.8GB/s
Ring Bus Memory Controller NIL NIL 256-bit (for memory reads only) 256-bit (for memory reads only)
PCIe Interface x16 x16 x16 x16
Molex Power Connectors NIL NIL NIL NIL
Multi GPU Technology Yes (CrossFire) Yes (SLI) Yes (CrossFire) Yes (CrossFire)
DVI Output Support 1 x Dual-Link 1 x Dual-Link 1 x Dual-Link 1 x Single Link 1 x Dual-Link 1 x Single Link
HDCP Compliance Yes Vendor Dependant No No
Estimated Retail Price (US$) ~US$85 ~US$80 - 100 ~US$90 - 120 ~US$80

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