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Originally Posted by Zetr0
Its doesn't *overclock* perse' it just hammers the rams a bit harder (30% in the case of a 66mhz Osc on the A3640), the frequency is still the same as this is governed by the motherboard clock.
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Sure, since regular DRAM isn't clocked, it simply has a certain access latency, but the effect is the same.
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A thought would be that you could change the RAM to 60 or 50ns, this might give you a little extra milage, although I do believe the real culprit of limit will be the latching logic that decodes / address the rams themselfs.
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I tried unplugging everything but the chip ram SIMM, but still couldn't get it to boot at 40 MHz. Unfortunately I don't have any fast SIMMs lying around, and no oscillators for testing 35 and 37.5 MHz, but 33 MHz is likely not the limit.