Qbert Battery Backed SRAM Question

HighScoreSaves

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Quick question for BB SRAM in a Qbert -

What ms is best? 120 or 150?
I have a few of the DS1220AD-150 (which should be good for spikes from a PS).
Anyone use something else?
 
Also, I am wanting to ensure that the reset line does not corrupt the HS. I read that c25 is rated at a 25v 100uf, but recommends replacing with a 470uf.

Would a M radial 25v 470uf be ok?
 
Is M the tolerance rating on the capacitor? Most electrolytics are 20%, so you want to stay in that tolerance range. going from 100uf to 470uf is just lengthening the time that the cap charges and discharges so you don't want to get a cap that is to sloppy on tolerance, although it doesn't have to be precision.
 
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