You can easily OC your 955 to 3.8 GHz - as every CPU is not like the others of the same kind, you can get to 3.8 without or with a slight increase of the vCore, or you are fine to run it with 1.45 V max to achieve 3.8 GHz. Be advised that if you turn the multiplier to reach that clockspeed, no more Cool'n'Quiet avaiable.
If you have a good aftermarket air-cooler you have no problems with the temperature. Core-Temp shouldn't exceed 65°C as AMD specifies the CPU to that temp. And don't push up the vCore over 1.5V as it will shorten the life of the CPU by a big amount. Even 1.5V is killer, but inside specifications. Disable Loadline Calibration (LLC or w/e - depends on what Mainboard you use, could be named different)! As you don't want voltage spikes above 1.5V if you set your vCore to 1.45V - that's probably why I have to set a vCore of 1.45V because on heavy-load the vCore of your CPU drops a bit below 1.45V, so you just set a higher vCore in your BIOS to keep it stable.
As I said: I don't know how lucky you are, and on what point you have to increase your vCore but always watch temperature and vCore under heavy-load (Prime95, Battlefield 3, Crysis, Benchmarks like 3DMark11 etc.) and test for 4-5 hours under heavy-load to be certain to achieve a stable state. If your PC freezes, set vCore higher for 0.25Volts. If you dont reach 3.8GHz with 1.5V you just have a bad chip and you have to give it a try with 3.7GHz or less.
I don't know if OC will bring you that a playable emulation, but you can try and you get a very good CPU for free.
E: If you don't know anything about CPU OC - don't mind and read some FAQs on different Hardware-sites and forums, and just don't overdo it with the voltage (not Higher than 1.5V and not hotter than 65°C core-temp!). nowadays CPUs are nearly undestroyable as they have build in safety-features. Don't be surprised if your PC freezes, reboots, blue-screens etc. just push voltage or lower the Multiplier.
If you have a good aftermarket air-cooler you have no problems with the temperature. Core-Temp shouldn't exceed 65°C as AMD specifies the CPU to that temp. And don't push up the vCore over 1.5V as it will shorten the life of the CPU by a big amount. Even 1.5V is killer, but inside specifications. Disable Loadline Calibration (LLC or w/e - depends on what Mainboard you use, could be named different)! As you don't want voltage spikes above 1.5V if you set your vCore to 1.45V - that's probably why I have to set a vCore of 1.45V because on heavy-load the vCore of your CPU drops a bit below 1.45V, so you just set a higher vCore in your BIOS to keep it stable.
As I said: I don't know how lucky you are, and on what point you have to increase your vCore but always watch temperature and vCore under heavy-load (Prime95, Battlefield 3, Crysis, Benchmarks like 3DMark11 etc.) and test for 4-5 hours under heavy-load to be certain to achieve a stable state. If your PC freezes, set vCore higher for 0.25Volts. If you dont reach 3.8GHz with 1.5V you just have a bad chip and you have to give it a try with 3.7GHz or less.
I don't know if OC will bring you that a playable emulation, but you can try and you get a very good CPU for free.
E: If you don't know anything about CPU OC - don't mind and read some FAQs on different Hardware-sites and forums, and just don't overdo it with the voltage (not Higher than 1.5V and not hotter than 65°C core-temp!). nowadays CPUs are nearly undestroyable as they have build in safety-features. Don't be surprised if your PC freezes, reboots, blue-screens etc. just push voltage or lower the Multiplier.