Acer Nitro KG271U Z2bmiipx Hits $169.99 at Amazon, but Its 275Hz Is an Overclock

The Acer Nitro KG271U Z2bmiipx is listed at $169.99 at Amazon, down from $199.99, and Acer's own spec sheet gives the panel a standard refresh rate of 144Hz. The 275Hz in the listing title sits in a separate row labelled overclock refresh rate, and it is reachable only over DisplayPort.

The configuration is a 27-inch IPS panel at 2560 by 1440, with two HDMI 2.1 ports, one DisplayPort 1.4 input and a pair of speakers rated at 4W in total. That split matters, because Acer caps both HDMI ports at 2560 by 1440 at 144Hz, so the headline number depends on the single DisplayPort.

Amazon names itself as the seller and shipper, and the listing is not restricted to Prime members. The $30 cut is 15 percent, so the discount is the least interesting thing here.

Acer Nitro KG271U Z2bmiipx specifications

Where the 275Hz actually comes from

Acer's tech specs page for part UM.HX1AA.203 keeps the two numbers apart. The standard refresh rate row reads 144Hz, and 275Hz appears only under overclock refresh rate.

The Nitro KG1 series page footnotes that plainly. Acer says the stated refresh rate is achieved through overclocking, that the actual rate may vary with hardware and settings, and that overclocking may void warranties or affect system stability.

The interface split is the other catch. Two HDMI 2.1 ports are a generous count at this price, yet Acer rates both of them at 144Hz. That turns the choice between DisplayPort and HDMI into a real one rather than a matter of which cable is nearest. Acer includes one cable of each type in the box.

The 0.5ms response time is an overdrive number

Acer lists the response time as 0.5ms, then lists 1ms GTG in the detail row immediately beneath it. Only the slower figure carries the grey to grey label on the spec table.

The series page calls it 0.5ms GTG minimum and footnotes it as a non-native response time achieved via LCD overdrive. Acer does not publish the overdrive setting used to reach it, and it publishes no MPRT figure at all.

Brightness, contrast and the HDR10 label

Brightness is 250 nits and the native contrast ratio is 1,000:1, which are ordinary numbers for an IPS panel in this bracket. Acer also quotes a 100,000,000:1 dynamic contrast ratio, a figure that describes backlight behaviour rather than what the panel holds in a single frame.

Colour coverage is 90% DCI-P3, and the colour depth row reads 8-bit plus FRC, with 10-bit achieved by dithering. The 1.07 billion colours in Acer's table come from that frame rate control, not from a native 10-bit panel.

HDR10 appears in the features row, and that is the whole of the claim. Acer publishes no VESA DisplayHDR tier for this model, so there is no certified brightness floor behind the HDR badge on the listing.

The stand, and what Acer charges for the same part

The stand tilts from -5 to 25 degrees and does nothing else. Acer's table answers no to adjustable height, no to pivot and no to an adjustable stand, which leaves the 100 by 100 VESA mount as the route to a different screen position.

Acer lists the same part number at $199.99 on its own site and shows it out of stock, so the $199.99 anchor is a price Acer genuinely asks. Acer's own where-to-buy data on that page also quotes the $169.99 Amazon figure.

The suffix is worth reading closely. Acer separately lists a KG271U X1bmiipx at $169.99, the same 144Hz standard refresh rate and the same 250 nits, so the name alone does not identify the faster panel.

A few things stay unpublished. Acer gives no overdrive setting for the 0.5ms claim, no swivel range, and its series page still describes AMD FreeSync Premium certification as an application in progress, even though the product page lists it outright. Prices and stock at Amazon can change at any time, and the figures here are the ones the listing showed when it was checked.