Actually the GTX 460SE is about 15% slower than a GTX460 1GB.http://www.techpowerup.com/reviews/Gainward/GeForce_GTX_460_SE/27.htmlhttp://www.hardwarecanucks.com/forum/hardware-canucks-reviews/38178-nvidia-geforce-gtx-460-se-1gb-review-17.html
Assuming it overclocks the same I run my EVGA GTX 460 1GB at 820-1640-2000. It will go higher but that's fine for what I do with it.
Since you are a hardware "expert"
you should know that the core and shaders are linked and overclocking them nets a much higher benefit than overclocking the memory. You should also know that no two overclocks are the same, and if you want to find the limits of your card it takes trial and error just like with any overclock.
So I Must Ask Out Of The Three Variables (Core/Shader/Memory) Witch Of Them Has The Most Impact On Overall Shader Performance?
Makes no sense? The shaders obviously have the most impact on shader performance.