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@Eloo wrote:

Hello,

Is the difference between these two monitors only in color? Why if compared the HF model is IPS while the HFL is Fast IPS? Is it just an error in writing the description or is there a difference?

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The L standards for Premium.  So the "HFL" is the Freesync Premium version. The "HF" is the standard Freesync. 

Displays certified for the AMD FreeSyncTM Premium Pro tier include highly accurate luminance and wide color gamut testing to enable an exceptional HDR visual gaming experience. Any game titles that use the previous FreeSync 2 HDR branding, are supported by FreeSync Premium Pro displays. Going forward, new games that support FreeSync Premium Pro technology will use the new branding.

https://www.amd.com/en/technologies/freesync-hdr-games

The difference is also reflected in price, $384.99 vs. $346.49. 

$384.99 AW2521HF Dark Side of the Moon

$346.49 AW2521HFL Lunar Light

That was just a quote from Amd, website linked in above post. 

in the first answer you mentioned hdr but none of the 2 have HDR or am i wrong?

This is incorrect. The "L" is simply the the HF in the Lunar Light color, while the original HF is the Dark Side of the Moon color. They are both Freesync Premium/G-Sync compatible certified, although, the HFL's G-Sync certification is pending in a future Nvidia driver release. The manuals for both of these models back up this information.

These monitors also do not support HDR @Eloo 

If you click the links to Dell's website it clearly states for the hf version "AMD FreeSync |NVIDIA G-SYNC"

And for the hfl version it clearly states "AMD FreeSync Premium |NVIDIA G-SYNC"

There's also the $120 price premium for the model advertised as "premium." So either Dell misadvertised it or the L is for the Freesync premium, which you pay extra for.

This is also a common advertising tactic used by Dell for unwary purchasers.  For example S2716dg vs s2719dgf, for with vs without the gsync module for gsync capable vs compatible. Or up2718q vs u2718q, for premium full range color, a $500 price premium.

On the Italian site (I am Italian) the price is the same and both are FreeSync premium but I have not checked and I ordered the hfl version even if I preferred it black. I tried to contact support but they just shipped. I had to check it personally before ordering.

Interesting.  I just ended up buying a different monitor last week though so not too interested in figuring out heads or tails.  I'm sure it'll eventually get sorted out once Dell gets enough inquiries about it. 

Regardless, this is still incorrect when the HF is Freesync Premium certified. And this is also an error on Dell's end for incorrectly listing them like this. They are the same exact display, just in different colors. The HFL just came out, Dell has a habit of not instantly marking down items that are new. Read the manuals, or don't read them, it's just an error on Dell's end that they have not corrected yet.

If you want even more proof, AMD's own website lists the HF as Freesync Premium certified. https://www.amd.com/en/technologies/free-sync