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ATI Radeon X1900XTX - Performance and overclocking - Overclocking: Air cooling

Overclocking is dear to us, and when ATi even supplied us with a program for that purpose we weren’t going to miss the opportunity. We start off by overclocking with what will probably become the most common cooling solution, namely the original heat sink. The fan is adjustable from within the application and the first thing we did was to set it to maximum speed. We also set up some additional fans to improve cooling capabilities.

Overclocking - Air cooling
Frequency [MHz]
Memory (overclocked)
Memory (stock)
Core (overclocked)
Core (stock)
  0 200 400 600 800 1000

Overclocking - Air cooling
Percentual increase
X1900XTX Memory
X1900XTX Core
  0 8 16 24 32 40

First off we tested the memory, which according to specifications should reach roughly 900MHz as we’d established earlier. 909MHz gave occasional artifacts, 918MHz more consistent “snow” and 927MHz caused freeze-ups during 3DMark. We stopped at 900MHz and moved on to the core. The core went all the way up to 735MHz, but to manage a run through 3DMark05 we had to step down to 729MHz. Finally we set the CPU to 3GHz (12x250) and ran 3dMark05. The result was 12983, but 13000 would have been more fun so we turned up the processor to 3050MHz. 13030 points using a video card with original cooler and an air-cooled CPU must be seen as a good result. The voltages are untouched and we get the feeling that the overclocking software didn’t manage to change them, as our overclocking results weren’t affected at all.

We install water cooling and open a window.

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