AOC C27G4ZH 280Hz Curved Monitor Is $129.99 at Amazon, $10 Less Than AOC's 1440p Model

Amazon has the AOC C27G4ZH 27-inch curved gaming monitor at $129.99, which is exactly what AOC charges for it on its own store. The more useful figure is $139.99, because that is what AOC asks for the Q27G4XN, a 27-inch monitor with 78 percent more pixels.

The C27G4ZH is a 1500R curved VA panel running 1920 x 1080, rated by AOC for a 280Hz maximum and a 0.3ms MPRT response time. AOC puts the pixel density at 81.59 per inch.

That density is the whole trade. At $129.99 this monitor spends its budget on refresh rate rather than detail, and AOC's own catalogue prices the sharper option within $10 of it.

How the C27G4ZH reaches 280Hz

AOC's specification table lists a single maximum refresh rate of 280Hz and carries no separate overclock row. That is worth confirming, because some makers rate a panel lower and file the advertised number as an overclock.

The qualification sits in the signal-frequency row instead. AOC lists 48 to 240Hz over HDMI 2.0 and 48 to 280Hz over DisplayPort 1.4, so only the DisplayPort input reaches the headline rate.

Both HDMI ports stop at 240Hz, which is the ceiling for anything connected over HDMI, including the consoles the Amazon listing names. AOC does put one HDMI cable and one DisplayPort cable in the box, so the faster connection does not cost extra, much like the Sceptre ultrawide that reserves its top refresh rate for DisplayPort.

Variable refresh is published as a 48 to 280Hz range. AOC calls it Adaptive Sync and lists no FreeSync Premium or G-Sync Compatible certification for this model.

AOC C27G4ZH specifications

What AOC charges for the rest of the line

AOC's store runs the same $129.99 against a $179.99 reference price, which is $10 above the $169.99 list figure Amazon shows. The price a buyer pays is identical in both places.

The slower C27G4H, a 180Hz version of the same 27-inch curved 1080p format, sits at $159.99 on that store. Within AOC's own range, the 280Hz model is the cheap one.

The Q27G4XN at $139.99 is the one that complicates the decision. It is flat rather than curved and tops out at 180Hz, but it runs 2560 x 1440 and AOC rates it at 5,000:1 static contrast against 3,000:1 here.

Anyone set on 1080p has cheaper AOC options too. The C27G4H2 was $99.99 for Prime members on 2 October, at 200Hz and with a higher 3,500:1 static contrast rating.

What AOC does not publish

The 0.3ms figure is measured as MPRT, and AOC gives no grey-to-grey number for this model at all. The omission looks deliberate, since AOC's spec table for the Q27G4XN does carry a separate 1ms grey-to-grey row.

MPRT measures motion blur rather than pixel transition, so it is not comparable with a grey-to-grey time. A 1ms grey-to-grey claim for this panel appears only in AOC's marketing paragraph on the product page, not in the specification table or the leaflet.

HDR gets the same treatment. There is no HDR row, no VESA DisplayHDR certification and no HDR brightness figure, and the only brightness AOC states is 300 cd/m2 typical.

No speakers are listed, there are no USB ports of any kind, and the absent pivot row rules out portrait rotation. The colour figures are quoted to CIE 1976, which reads higher than the CIE 1931 numbers most makers publish.

Stretching 1080p across 27 inches is a familiar compromise at this price, as the Samsung Odyssey G3 G30D at the same $129.99 showed. No end date is attached to the Amazon price, and neither Amazon nor AOC publishes one, so both figures can move without notice.