dual core or 64

For gaming, what you want is the single core Athlon 64 FX. Despite the performance benefits that the X2's extra core brings, the Athlon 64 FX is still the best processor for gaming.

Why? Until games start being coded for multiple processors, you'll get better game performance out of the single core chip. Right now, the FX-55 is clocked at 2.6GHz. The top of the line X2 4800+ is only clocked at 2.4GHz. Both chip's cores have 1MB of L2 cache and connect to the system through a single HT link. If a game is single threaded, it will at any given time be running on only one of the two available cores. So the FX has that 200MHz advantage.

In the meantime, the X2 is targeting the "digital media" apps (or video editing in your case), for which the chip brings a 30-50% performance boost over its single core CPUs.
 
The FX offer the maximum performance gains compared to the regular Athlon 64 CPUs. They have the largest on-die cache memory for desktop PCs. It also features unlocked clock multiplier which enables pro users to exceed the stock frequency of the processor.
 
FX is like the higher up version of the 64. The X2 has two cores. If you want your PC to be future proofed, you have to get an X2. The X2 will game exactly the same as it's single core partner. For example, the X2 3800+ is two 3200+s stuck on the same die. So, you'd get the same performance as a 3200+ in games AT THE MOMENT. In the future, games will become multi-threaded, meaning your X2 will get a way higher frame rate than a 3200+. At the moment, the X2s are future-proofed, but for the price of the 3800+ you could get a better single core processor - but it is better to get two slower ones stuck together if you see my meaning :D
 
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