Slower Iyonix

i would like a nvm option to clock the disk interface /PCI bridge slower so that older hardware that has become unreliable due to cap ageing can continue to be used.

Ie lan max speed 100m, idle running at 33m not 66 and internal bridge clocked slower, and any other reliability suggestions.

With maybe even a hot key on boot to put it in this mode.

I have 4 iyonix’s and only 1 is reliable, two work intermittently and the other will not read any hdd.

Title was typed Iyonix but autocorrect fixed it.

How do you know that “cap ageing” is to blame?

The iyonix’s buses are known to be quite intolerant of voltage rail voltages, which in most cases a new power supply will fix, however this means that rise, fall and ringing of lines must be of prime importance. All of my machines have got slowly worse, the only components that fail like this (unless someone else can suggest a better possibility) are caps from my personal experience, the other failures I’ve experienced similar have been caused by heat or board cracks – but I’ve only experienced these with PA – FETs.

All of my machines have got slowly worse, the only components that fail like this (unless someone else can suggest a better possibility) are caps from my personal experience

Any logic buffers on the lines? Noise in those can be a pig.

Many moons ago I worked at Plessey when they had a batch fault with Ti sourced HC line buffers generating their own noise into the supply lines. Looked like supply noise at first glance.

All possibilities should be considered.

We’re not these an issue from first switch on? My other reason for suspecting caps is I had a number of pc’s that failed in a remarkably similar way (in the mid 00’s) but they were made with the now know poor Chinese caps which aged very poorly.

Even if noise is to blame a slower clocked signal is far less prone to noise effects. Every doubling of clock speed requires 3db more of signal to noise (assuming standard techniques – digital filtering of the bits to dynamically compensate for noise such as DDR3 does can do better than this).