Mame Performance XP 64bit Vs Windows 7 64bit

[Andypc]

I setup Windows 7 64bit on one of my Arcade PC's and got everything running, but had an issue with the boot resolution as it output 1024x768 for about half a second even with the low resolution boot screen enabled. So I decided to try XP 64bit instead, but have noticed a couple of games that were running full speed on Windows 7 are really choppy and dropping below 80% on XP 64bit. The games is question are Tekken 3 and NFL Blitz. I used exactly the same 64bit build and set-up of Mame on both operating systems.
 
So my question is:-

Is there a performance difference between XP 64bit and Windows 7 64bit when using a 64bit build of Mame?

[Endaar]

Probably a performance difference in the underlying drivers. XP x64 support wasn't the best, while obviously with Win 7 64-bit systems became mainstream.

[Howard_Casto]

I'll agree this is the most likely culprit. 

Honestly though, there's no way of knowing. 

[BadMouth]

Updated from xp64 to win7 on my driving cab pc.  Same emulators, same settings, the games ran the same.
Some like California Speed were just barely maintaining 100%, so I'd be able to tell if there were much difference.  (calspeed is the same hardware as nfl blitz)

This wasn't an issue on my driving cab, but when I updated to the latest NVidia driver on my stand-up cab the performance went to crap.
NFL Blitz went from running full speed to being unplayable.  Reverted to an older one and everything was back to full speed.

[Andypc]

The latest AMD Catalyst driver for XP 64bit are 13.1 and Windows 7 64bit are at 13.9.

[Andypc]

I just tested XP 32bit with a 32bit build of Mame and it's running Tekken 3 faster than XP 64bit with a 64bit build of Mame 

I have check that I have all the latest drivers for XP 64bit and everything appears to be working fine, but I should get a speed improvement over XP 32bit not the opposite.

Window 7 64bit runs the fastest, but I haven't got a solution yet to the boot resolution issue with Windows 7 

[Tzakiel]

FWIW I use 32 bit mame to run in 32 bit XP, and everything I throw at it runs at 100% including most 3d games.  4.3 ghz i5.