A 486DX-25 means it is a 80486 CPU running at a whopping 25 MHz! The DX means it is the full chip that included a math co-processor built in. Intel made a cheaper version of the 486 that was marked SX, which meant the math co-processor was not built in and the cpu would be slower than a DX chip. The socket next to the 486 was a math co-proceesor or overdrive socket. If you had a 486SX, you could buy a 80487 math co-processor and plug into that socket to make your SX into a DX. You could also plug in an overdrive chip that would double the cpu clock speed eg DX2.
The ram is most likely 1 MEG each. The fingers will look silver since they were coated with tin, hence tin memory.
Mike
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