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Well there we have it, the R423, quite unexciting to say the least and certainly not worth contemplating if you already have a X800XT AGP board. Its also clear that right now PCIe doesnt have the hardware available to stress its theoretical bandwidth limitations with the R423 performing no better and in some cases slightly worse than its AGP counterpart. Its hard to get a totally equal testing platform and some of these differences could well be due to the underperforming DDRII on the PCIe system. Its not a bad move by ATI releasing the R423 because its a board that will tide you over for many months if you are wanting to get into PCIe (when its readily available on the market), but dont be expecting groundbreaking performance over current AGP hardware. This will of course in time change when next generation hardware hits the market. As for overclocking, the board was not a wonderful overclocker with the core hitting only 20mhz over the stock figure, yielding an end result of 520core, the ram gave better results with it reaching 560mhz. I didnt supply overclocked charts as really for most of the tests you can add around 5-10fps to the figures shown on the previous pages. The R423 wins the heavenly hardware silver award
On an interesting final note I was recently contacted by a Driverheaven member called Adrian Lark who creates an Open Source OpenGL Benchmark Application. Its a developer based benchmark which is meant to test amongst other things the readback speed of a graphics card. I ran this test (glReadPixels) on both the AGP and PCIe ATI boards, and below ive supplied my findings. In my talks with Adrian Lark he mentioned that current AGP based ATI boards generally hit around 80-90m/ps with Nvidia around 180m/ps, you can see the results below for that specific area in bold/italic
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