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can the dualcore 2.8 intel run at 100%

Not sure what you mean. CPU utilization is a function of the demands that running applications make on the CPU. I don't think I have every seen both my cores at 100%, but BF2 with the beta nVidia drivers gets them both over 70% at times.
 
I don't have a dual core yet, but I do have some dual processor systems (same basic theory in CPU utilization). Basically the only way you will ever get both of your cores going at 100% is to have two threads (or more) running that use 100% of your CPU cycles. for instance, running two instances of Prime 95 simultaneously will bring them up. Im my case when I am rendering a 3D image or animation in Lightwave I tell the program to use two or four threads for rendering on the dual processor boxes, and it iwll use 100% of both CPU's for the polygon rendering...

CPU utilization is dependant on the software you are running.
 
For the x2 what you do is install prime95 then copy the folder to another location(so you can open 2 instances). Open the first one set the affinity to run on one core and then open the 2nd instance and set that one to run on the other core. I just did this with my 4800x2 and both cores ran at 100%. I was still able to browse in firefox and watch a movie with no slow downs what so ever.

Im sure the pentiums are the same way.
 
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