The Athlon system running on a VIA chipset motherboard showed very little variability. However, overclocking stability was very good with the CUV4X. At MHz, that is probably acceptable behavior. The most overclockable Pentium IIIs are the E and E models, which often will run at MHz on the front side bus, if the motherboard and memory can handle it too. One thing I hadn’t tried at this point was changing the CPU. At first I thought the system wasn’t going to boot.
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Unfortunately, at the time of this review, we only had 1 Celeron-2 chip available for testing, so I’m not sure if these results are typical. I even tried a different power supply, also without effect on the variability.
However, overclocking stability was very good with the CUV4X. But I did not see asuss drop in performance, or variability of results, after running 3D Mark on that machine. This occurred right after a fresh, cold boot, so it is inherent in the system. I tried that with a core voltage of 1.
The next step was to try MHz on the front side bus. With a little more work, Asus could make it a soound board.
ASUS CUV4X-E, Socket , Intel Motherboard | eBay
The most overclockable Pentium IIIs are the E and E models, which often will run at MHz on the front side bus, if the motherboard and memory can handle it too. The next available speed was 85MHz. At this setting, the system was running at MHz, with a memory speed of MHz. However, there was almost no variation in Norton benchmark numbers from run to run. The chart below shows some of the kinds of variability I observed. This was not the case. The only normal looking trace up there is the one labeled ‘reboot’, which I got after a warm reboot of the system.
You will also notice the dip in the dark blue line at the 4th test above. I tried 2 other CUV4X motherboards, and got similar results. One thing I hadn’t tried at this point was changing the CPU. I then set the 3D Mark demo to a continuous loop, and left it running overnight. I tried out a new Celeron-2 flip-chip. Virtually identical results were also obtained after running other programs e.
When I returned the next morning, the demo had dropped out to the desktop, but the system had not hung. A typical score after a clean reboot was Norton units. One thing that soudn me about the overclock settings was that they did not go in order in the BIOS menu, but rather, jumped all around, forcing you to scroll the long list to find the speed you wanted.
I tried a flash update to the BIOS from version tosuond this had no effect on the benchmark variation. The system ran 3D Mark without a hitch. All overclock testing was done with a asu voltage setting of 1. The Y axis is exaggerated in the chart below, to highlight what variability there was.
ASUS CUV4X-M – motherboard – micro ATX – Socket 370 – Pro133A
I rebooted and got cyv4x numbers, but later, after running 3D MarkI noticed increased variation in the Norton benchmarks again.
That means when you turn the system on in the morning, it will be asis 20 seconds before you can tell that it has responded! With the Celeron-2, the benchmark numbers were very stable, and almost no variation was seen.
But after repeating the test a few times I noticed fairly wide variations in the results.
ASUS CUV4X-E – motherboard – ATX – Socket 370 – Pro133A Series
At MHz, that is probably acceptable behavior. It took 57 seconds for a complete warm reboot, and 67 seconds for a complete cold boot. I canceled the benchmark, went to Windows, and ran the Norton benchmark.
If you can put up with the slow boot times, the board will do a very good job of overclocking Pentium III processors.