Is the AW3420DW guaranteed to work at 120Hz?

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The reason I ask this is if you read the literature for the 18DW and compare it to the 20DW there are some subtle differences. The 18DW literature mentions that the monitor is native 100Hz and overclockable to 120Hz, so hinting it may not actually work at that frequency, but the 20DW literature doesn't mention overclocking at all. It just says it runs at 120Hz. Now I know that the G-Sync modules are native at 100Hz so does this mean that Dell have only factor overclocker units to the 20DW? I don't know. I mean I am not going to pay an extra £250 for a monitor if it turns out it won't run at 120Hz.
I asked Dell CS about this and they replied:

Agent (Anilkumar_Kalakoti): "Yes as the description clearly shows that the native resolution would be 120Hz so it would give you 120hz without overclocking"

So it "seems" the answer is yes, Dell are selling the monitor with factor over-clocked G-Sync boards??

I am hoping someone knows more about this than I do... lol
 
From TFT central news piece

“The screen again supports NVIDIA G-sync via a traditional G-sync hardware module, and so supports a maximum 120Hz refresh rate. This is actually the same refresh rate that was supported by the old AW3418DW but on that model it was a 100Hz native panel which had to be overclocked to 120Hz. On the AW3420DW it’s actually using a 144Hz native panel, but this is under-clocked to allow the G-sync support to 120Hz. This was the same situation we saw from the LG 34GK950G so you can read our review of that model for more information about this.”


The difference is that the old model had a native 100Hz panel which is where the overclocking came in. The new model has a native 144Hz panel which is being downclocked to 120hz. The Gsync module is being overclocked yes, from 100 to 120Hz but that is considered far more reliable than a panel overclock. So the 120Hz should be more achievable on the new model
 
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