SSE4.1 for sure.
SSSE3 can sometimes be faster or slower than sse3 depending on the application since the only difference is it's stackless (which is what the extra s stands for). In dolphin is appears to be slightly slower than sse3.
All core 2 duo/quad cpus starting with a 7, 8, or 9 support sse4.1 so his cpu definitely supports it.
Hey thanks guys! Downloading cpuz now. Will try SSSE3 and SSE4.1 (if cpu supports it) and tell you my results
Edit: Xtreme, will there be an optimized version of 6505? Or do you take time to make sure the build is a good build before optimizing it? Don't mean to sound critical, I'm just curious about the process ^_^
Even though I test my builds, that isn't the cause of the delay. During the day I deal with really crap speeds for my internet connection and can't upload anything, so I have to wait until after midnight when my connection will be running better. I'll probably have optimized builds for r6505 up by tonight/tomorrow and throw up another new build if there is a new commit by then.
I have a Q6600 OC'ed to 3.0 GHz, which is better, SSE3 or SSSE3? This has always made me wonder.
Xtreme2damax you could optimize this SVN for SSE4.1 and SSE4.2, this SVN is working the Hires Textures RE4, that's all, thank you, I'm counting on you.
http://www.mediafire.com/?p34resnuarrw8z5 Dolphin-r6505-x64-RE4.7z
@Amici
For dolphin, SSE3. Dolphin is not designed to properly use a stackless simd stream.
@Xtreme2damax
is possible apply the Zelda TP(GC) Sound Fix patch ?, the game runs very smooth with SSE4.1, but hasn't BGM in the cinematics scenes
the Lectrode's Build has BGM, but the game runs with some jerkyness
regards!!

If you are referring to neXus's patch, then that is already committed since a while. BGM and other AFC audio will still cut out after a while due to the buggy AFC decoder, there is no fix for that right now.
I registered to say thank you.
I'm using your builds and they work great.