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Added memory and switched to 64 bit and everything seems slower???

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kahlid74:

You have to go back to what MonMotha said above.  64-bit can be fast if utilized correctly (registers, etc).  As Haze has pointed out, Mame for 64-bit is faster (makes use of additional registers, etc.) so running on a 64bit system you should see an improvement. 

So the OP should have seen an improvement.  Since the Op didn't I would go back to the documentation provided by the MAME dev's for configuring a 64bit system and make sure they have everything configured as expected.

Arbee:

As Haze said, MAME always benchmarks faster in 64-bit, even on cheezy Ultrabooks.  In the OP's case, I would suspect a couple of things:

1) Slow RAM.  MAME uses all the memory bandwidth you can give it.  This doesn't mean you need expensive gamer DIMMs, but don't gimp your processor either.
2) XP64 isn't very well optimized; it was essentially a one-off for developers.  Win7 and later have kernels tuned by Aaron Giles and therefore work supremely well with MAME.

Fursphere:

XP64 never received Service Pack 3.  A lot of things require SP3 for XP. 

I would consider XP64 an unfinished OS.  If you run it and it works for you, great.  If you are having issues with it, dump it and move on.

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