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The XP1900+ posted without any problems at 1716 MHz, however, the criterion used for overclocked stability was that the CPU had to run all benchmarks without problem at no more than 0.025 V above default which is 1.775V. This is an arbitrarily defined number and there are certainly some out there that will push the voltage higher in order to achieve higher clock speed. 1.775 V is within reason, though and does not pose any further risk for the CPU. In addition to running all applications, both CPUs (XP1800+ and XP1900+) also had to run at least 24h of RC5 without crash. The 1900+ almost made it to fully stable operation at 1704 MHz but crashed at the end of the TrueSpace 5.1 ray-tracing benchmark. [an error occurred while processing this directive]

At 1704 MHz, the XP1900+ occasionally crashed which is reason enough to step down one notch and run all benchmarks at 1692 MHz (141 MHz x 12.0). The same picture emerged with the 1800+ at 1692 MHz (147 MHz x 11.5) which is why comparative benchmarks were run at 146 MHz x 11.5 or 1680 MHz.

All benchmarks shown in the following were either run at stock speed (1800+, 1900+ MHz) or else at 1680 or 1692 MHz for the XP1800+ and 1900+, respectively.

Benchmark Results

Incoming

To start with the irrelevant (since nobody is going to be able to take advantage of increasing the performance from 400 to 460 fps), Incoming is still an interesting tool to measure the CPU performance as well as the latencies of the memory subsystem including those caused by higher CPU multipliers. Since the benchmark runs exclusively from the system memory, there is no impact of I/O latencies of e.g. the HDD.

Average frame rates of Incoming Gameindex. The XP1800+ scores are in purple, those obtained with the XP1900+ are, er, iridescent. At default settings, the XP1900+ is about 2% faster than the XP1800+ but there are limitations, e.g. the memory bus that hold back the system performance gain. The role of the memory and front side bus latencies show in the overclocked scores where the nominally slower XP1800+ runs up to the same fps as the XP1900+ at marginally higher clock speed and exceeds the score when running at the same clock speed but higher bus frequency. Keep in mind though that these differences are almost unnoticeable.

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