I'm torn about actually building a Slot-A system even though I have all the parts including a couple Thunderbird 900Mhz that were in some computers that I picked up for free years ago because somebody was throwing them out.
I did modify a S939 Opteron heatpipe cooler to work on Slot-A CPUs and it keeps them nice and cool.. and this is on the older Slot-A Athlon CPUs. The cooler even clears all the RAM slots on the motherboard. Made me realize even more that the coolers we had back then were absolute trash.
I also have another cooler set aside to modify but never got around to it.
The really fun thing about Slot-A CPUs is that the actual CPU core was almost always a higher speed core sold in a lower speed CPU package. A lot of the 500Mhz ones were actually 650Mhz and then you just go up form there.. such as a 800Mhz to 850Mhz being sold as a 700Mhz. If you were real lucky, the L2 cache was the same speed or faster than the CPU core was meant to have.
Some of the less high end CPUs had faster L2 cache than the faster CPUs due to the cache divider needed for the higher clocked CPUs.
I never used the gold finger devices back in the day. I just did the resistor / jumper mods to change the voltage, multiplier, and cache divider.