The Unstability comes from cheap slow RAM.
Higher clock speed and it getting to hot.
Thermal paste and a good heatsink and fan.
A 486Heatsink & Fan if you can get one fits really well you just have to warm the plastic legs up in hot water to bend them out a few mm's first.
I bought a Blizzard 1260 in Jan 1996 from Gordon Harwood (If any body remembers them)
Overclocked as long back as 1997 to 64Mhz and used it with BlizzardSCSI in a Micronik 1500T Z2 Busboard etc all handing off an unfixed 1d4 AT mobo with no timing problems at all for years before selling it. Used 2 matched 60ns 32Meg Simms.
The 1260 is still going in a RAmiga Z5 tower to this day at my friends house.
My Blizzard 060 603e 240 SCSI / BVision Replaced it and that got overclocked with no problems.
Replaced the 60Mhz Oscillator with a 70Mhz one from onspec to boost it to 280Mhz with no problems at all. However it failed with to run for more than 5 seconds or so with a 75Mhz oscillator (300Mhz.)
