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I tried a flash update to the BIOS from version tobut this had no effect on the benchmark variation. So I used the E flip-chip for stability testing while overclocking the bus frequency. The system would not boot on the CUV4X.
ASUS CUV4X-E - motherboard - ATX - Socket - ProA Overview - CNET
Below is a graph of the kind of result that made me curious in the first place. In fact, the system showed normal, low variability most of the cuvx, but on occasion, would show increased variability in benchmark results. I tried out a new Celeron-2 flip-chip. The next step was to try MHz wsus the front side bus. I observed no glitches, and the system ran everything without hanging, or dropping to the desktop.
Pentium III overclock stability seemed better than Celeron-2 overclockability, but we did not have extra Celeron-2s around to test, so we can't say for sure.
ASUS CUV4X-M - motherboard - micro ATX - Socket - ProA Overview - CNET
The system benchmarks did not increase when going from MHz to MHz on the bus frequency, probably because the memory speed had to be reduced. One thing that irritated 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.
With a asks more work, Asus could make it a great board. System performance was substantially lower than with a comparably clocked Pentium III system, but as I mentioned earlier, the performance variability seen with the Pentium III was not seen with the Celeron At a bus frequency of 85MHz, the system speed rating was MHz.
All overclock testing was done with a core voltage setting of 1. Overclocking with the Celeron-2 was rather disappointing. The chart below shows cu4vx of the kinds of variability I observed.
The motherboard correctly recognized the chip, and booted up still a noticeably long boot time. That means when you turn the system on in the morning, it will be almost 20 azus before you can tell that it has responded! I rebooted and got better numbers, but later, after running 3D MarkI noticed increased variation in the Norton benchmarks again.
If you can put up with the slow boot times, the board will do a very good job of overclocking Pentium III processors. If you need an external COM 2, then you will need to install a back panel plate with a ribbon cable connection to the motherboard. The variability was intermittent, and did not occur after every reboot, or after every run of a 3D application.
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. Still, MHz on the front side bus is very respectable. I then set the 3D Mark demo to a continuous loop, and left it running overnight. One thing I hadn't tried at this point was changing the CPU. How much of a speed boost do you get at to MHz? It took 57 seconds for a complete warm reboot, and 67 seconds for a complete cold boot.
ASUS CUV4X-E, Socket 370, Intel Motherboard
By simply repeating the Norton benchmark over and over, I got wide variations from one asud to another. All-in-all, the CUV4X is a very nice board. These are very significant performance variations that I could not account for. The initial setup included: You will also notice the dip in the dark blue line at the 4th test above.
I tried higher and lower core voltages, but the system refused to boot. The chart below shows the Norton Benchmark variability at this speed. Virtually identical results were also obtained after running other programs e.
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