The HX apparently is better RAM the ZX appears to be the Value version of the same memory with with lower voltage running on it. I bet the HX version OC's better than the ZX. But not owning either of them I am not sure.
I have the HZ myself, but I haven't gotten a chance to OC yet, but I should be able to by tomorrow. I bought the HZ because of the many suggestions on many forums that recommended it. I also looked at some benchmarks and the HZ beat out the ZX. I'll try to get an OC and post back to you by tomorrow.
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