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Unfortunately, there are other components that will normally need upgrading to run reliably with any motherboard featuring the higher 100MHz buss speed, and the eagle‑eyed among you may already have noticed PC memory ads quoting different prices for SDRAM suitable for 100MHz operation. Since the Pentium II chips already feature a Level 2 cache that runs either at the processor clock speed, or at half of it, the improvements with the 100MHz buss are not so dramatic - but, of course, the 350 and 400MHz processors themselves are faster. This is because the two major areas of improvement for Super7 are the increased clock speed of the Level 2 cache, and that of the entire system RAM. Industry experts are actually predicting that the 100MHz buss will give greater improvements for the Super7 motherboards than for Slot 1 Pentium II systems. Mind you, the 100MHz buss is not just for those with bottomless wallets and purses who can afford the latest high‑speed Intel processors, since there are various manufacturers developing a Super7 chipset, which will work with Socket 7 processors (such as the AMD K6 series). However, in such systems the PCI buss actually runs at one third of system buss speed and so returns to the safe value of 33MHz, which prevents problems with PCI expansion cards. New motherboard designs based on the 440BX chipset can support any Pentium II processor, from 233MHz to 400MHz, but the two fastest models can now run with a front‑side buss speed of 100MHz, rather than the 66MHz of the others.Īs always, the overall system improvement is not as high as one might initially expect, but it's causing some people to worry that their existing PCI cards may not work properly if they buy a new system with a 100MHz buss.
The secret is the new Intel 440BX chipset, which has been designed for these new devices. The reason I mention all this is that, along with the many new processors I discussed in last month's PC Notes, there's a significant new feature appearing on systems with the fastest 350 and 400MHz Pentium II processors - the 100MHz front‑side buss (and yes, unfortunately there is a back‑side buss as well). This is not a criticism of Cyrix processors - it just illustrates once again that unexpected things can happen when you attempt to mix and match hardware from different manufacturers. The Darla card worked perfectly after this, although his PC would also run significantly slower. This processor uses a 75MHz buss speed by default, so I suggested that he try reducing buss speed to 66MHz. One reader recently emailed me after suffering a complete lockup every time he booted his Cyrix 6x86 PR200 MMX‑powered PC after installing an Event Darla soundcard. They're only designed to run at 33MHz (half the normal 66MHz buss speed), and although many will run at the slightly higher speeds of 37.5MHz (with a 75MHz buss speed) and 41.5MHz (with an 83MHz buss), others will exhibit glitches, or even lock up the PC altogether. However, overclocking can produce problems in another area for musicians: the speed of the PCI buss is normally half the system buss speed, and some soundcards (and any other PCI card for that matter) might suffer from erratic performance after such overclocking. Depending on the quality of your motherboard (and the RAM chips), you might then be prone to random crashes and other reliability problems.
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Some people even 'overclocked' the Intel chips, to these higher buss speeds, by changing jumpers on their motherboards, although warnings are normally issued with instructions on how to overclock, since the practice causes the processor chip to run hotter. However, although Intel motherboard chipsets were supposed to run at a maximum of 66MHz, others have been available which can achieve higher speeds, of up to 83MHz. Your PC's system buss controls communication between the processor and other parts of the computer's motherboard, and for some time overall performance of PCs has been held back by the 66MHz buss speed. Once this is complete, the repair window appears and you can decide on the best course of actions for any faults found. Particularly thorough is the Registry scan (shown here).
If your PC has problems, the Norton Doctor WinDoctor will diagnose and repair them.
There seem to have been a lot of new developments in the PC world of late, and since many are relevant to PC musicians I intend to open up the cupboard, probe into its darkest recesses, and reach for a change of clothing. This month, after a bit of clock‑watching, Martin Walker looks at a utility which should keep your PC running for longer.
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The latest version of Norton Utilities for Windows 95 has a handy front end (the Integrator) for quick access to any of its components.
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