I finally got my 4ghz Core 2 Duo built and it 100% stable  

, So since I promised a few people here benchmark scores on it here they are. 
All benchmarks we preformed with official (I686 optimized) 0.120 MAME release & near complete set of MAME 0.120u1 ROMs.
The follow command line was run from command prompt window inside Windows XP Pro SP2 (32bit):
mamepp.exe -noautoframeskip -frameskip 0 -seconds_to_run 240 -nothrottle -nosleep -video ddraw -skip_gameinfo -effect none -nowaitvsync -noreadconfig -mt 
[ROM NAME]Anyway here are the results. 
gaelco3d.c
- radikalb           88.21%   52.93fps
- speedup        102.93%   61.76fps
- surfplnt           91.29%   54.77fps
Mediagx.c
- a51site4        185.95%   111.57fps
medvunit.c
- crusnusa        225.23%   128.38fps   
- crusnwld         229.70%   130.93fps
- offroadc            395.36%   225.36fps
- wargods         376.85%   214.80fps
namcos22.c
- airco22b         97.73%   58.64fps     (major graphics problems)
- alpinerd            42.36%   25.42fps   
- cybrcomm       67.79%   40.68fps
- cybrcycc           125.69%   75.41fps   
- propcycl            70.44%   42.50fps     (other than two pauses looks like it's playing at hyperspeed but still has low score  

)
- raveracw        53.70%   32.22fps
- ridgerac            75.84%   45.50fps      
- timecris            70.84%   42.50fps
Seattle.c   
- biofreak            91.78%   55.07fps   
- blitz            122.34%   73.40fps
- blitz2k            121.94%   73.16fps
- blitz99            120.27%   68.55fps
- calspeed        146.21%   83.34fps
- carnevil            241.11%   137.43fps
- hyprdriv            140.84%   80.28fps
- mace            173.23%   98.74fps
- sfrush            144.95%   82.62fps
- wg3dh            253.19%   151.91fps
Vegas.c 
- gauntdl            108.58%     61.89fps (seems slower than gauntleg due to fly overs)
- gauntleg         108.57%   61.88fps               

- tenthdeg         62.03%   35.36fps
- xevi3dg           342.14%        205.28fps
model2.c
- Daytona         120.15%   72.06fps     (colours broken)
hornet.c
- gradius4         112.04%   67.91fps
Model3.c
- scud            40.98%   24.59fps     (graphics broken flickers like hell)
namcos21.c   
- starblad            140.06%   84.03fps
The namcos22.c driver looks to need a lot of work still, most of it roms show signs of emulation errors, so I would expect these scores to rise.
MAME performance basically scales 1 for 1 with clock speed, so say if you have a Core 2 Duo @ 3.2ghz your score will be approx 80% of these with the same setting.
If anyone has any other ROMs they would like me to benchmark on my system let me know, I'll do whole drivers if there is reason to. please no requests for pacman or donkey kong, for kicks I benched 1942 the result was 5570.54%,  3342.32fps (test lasted less than 10secs.) 

Also if anyone has a complied build of MAME 0.120u1 I686 optimized and MAME 0.120u1 64bit let me know, I would compile them myself but the last time I coded or compiled anything was back when I was writing Quake2 mods some 8 or 9 years ago so I'm a little rusty.  

I plan to benchmark these roms again under Vista 64bit in the near future, but I still have to install Vista and get it dual booting first. 
For those that wish to know, the spec of my PC are below:
Intel Core 2 Duo e6850 @ 4ghz, 500fsb, 1.55v (3ghz, 333fsb, 1.35v stock )  

Thermalright Ultra 120 Extreme, with 96CFM 120x38mm fan, ducted, and other mods.
Gigabyte GA-X38-DQ6 (crazy cool heat plate in place)
Corsair Dominator Twin2x2048-8500C5D G (2x1GB DDR2-1066 dimms @ 2x500mhz)
XFX Geforce 8800gts 640MB (stock clock, has hit 12000+ in 3DMARK06 when overclocked)
Enermax Liberty 620watt power supply 
3x Western digital 36gb Raptors in RAID-0
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