ASUS ROG Swift PG279QM Monitor Test

ASUS ROG Swift PG279QM Monitor Test - Dead Pixels and Uniformity Check

Before judging the PG279QM as a premium esports panel, separate pixel response from glow and uniformity. The ASUS ROG Swift PG279QM is a 27" 1440p 240 Hz Fast IPS monitor with a 1 ms GtG response time and NVIDIA G-SYNC processor.¹ It is designed for esports refresh rates; use this tool to check pixel response, IPS glow, and dead pixels.

Specifications¹

Fast IPS pixel response at 240 Hz and overshoot detection

Fast IPS pixels can move quickly, but that speed comes from overdrive, which raises the voltage applied during transitions to shorten response time while simultaneously increasing the risk of overshoot artefacts.² Overshoot occurs when a pixel passes its target brightness and briefly displays an incorrect colour before settling, producing the characteristic pale halo that competitive gamers learn to recognise immediately. On the PG279QM, start with the normal or middle overdrive preset, then inspect the moving pattern carefully for pale halos ahead of bright edges or dark trailing behind moving objects.

Checking overdrive at your gaming refresh rate

The PG279QM is a 240 Hz 1440p monitor with native G-SYNC support, and its full 240 Hz mode is reached over DisplayPort rather than HDMI, making the cable choice a prerequisite for accurate motion testing.³ To verify response behaviour on your specific unit, run the response time patterns at your normal gaming refresh rate first, then repeat with VRR enabled if you use it, because available overdrive settings can differ between VRR and fixed-refresh modes and comparing both states reveals whether the panel performs consistently across your actual usage scenarios.

Inverse ghosting from overshoot appears as a bright, pale halo or smear leading the moving object rather than trailing behind it. This is visually and mechanically distinct from the dark trailing smear of underdrive ghosting, which is what you see when overdrive is set too low for the panel to complete transitions within each frame window.

What a borderline result means

Not every monitor test result falls cleanly into the pass or fail category, and learning to extract genuinely useful information from ambiguous outcomes is a practical evaluation skill that serves you well in any hardware assessment, not just this specific panel. The PG279QM in particular rewards this approach because its 240 Hz Fast IPS panel can display subtle motion artefacts that look alarming on first glance but turn out to be normal overdrive behaviour once you isolate the variables. ### What a borderline result means

A borderline result is still highly useful if you record the specific conditions under which it appears, because contextual details transform a vague impression into actionable evidence you can share with the retailer later. Note whether the room was completely dark or had ambient light present, whether HDR was confirmed off in Windows settings, and whether the monitor was verified running at 240 Hz through DisplayPort rather than HDMI at the time the issue appeared, since each of those variables can change how severe a uniformity defect or faint pixel glitch looks on the panel.

Those details matter enormously because a panel can look significantly worse when the wrong input, an aggressive OSD overdrive setting, or a temporary GPU overlay is active, and without that context you cannot distinguish a real panel defect from a configuration artefact. If the result still looks severe after controlling those variables, reset the monitor to factory defaults and run the same pattern again before deciding what to do next.

Comparing the borderline result against a clean baseline separates a genuine panel defect from a setup artefact you can correct through configuration changes. Resist the temptation to compare your unit only against forum reports from other owners, because one user may be sitting closer to the screen, using a brighter room, or testing with HDR enabled without declaring it. Your own controlled documentation sequence is the strongest evidence for this specific monitor, especially when you need to explain the exact conditions of the issue to a retailer or support team who may not be familiar with your particular setup. Keeping a written record that notes the lighting state, refresh rate, cable type, and OSD settings active during the test transforms your observation from a subjective complaint into a repeatable evaluation that support staff can act on confidently.

DisplayPort setup and dead pixel testing on the PG279QM

Connect via DisplayPort 1.4 when testing 240 Hz, as RTINGS notes that the PG279QM's HDMI ports do not carry the full 240 Hz mode, making DisplayPort the only correct cable for maximum refresh-rate testing and verification.³ Before running any test patterns, disable any GPU overlay software that alters display output, including GeForce Experience, Discord, or MSI Afterburner overlays that can inject artefacts into the signal path. Open Windows Display Settings > Advanced Display and confirm the refresh rate shows 240 Hz before proceeding.

Run all six solid colour patterns for pixel defects before enabling or adjusting any OSD settings, because testing at factory defaults ensures you assess the raw panel quality without any software modifications that could mask or mimic defects. No IPS panel is entirely immune to pixel defects, so document any constant-colour dot with a photo before changing settings or contacting support, as this creates a timestamped record that predates any OSD adjustments.

After the pixel check, run the backlight uniformity test in a darkened room to assess IPS glow severity at the corners. Dell describes IPS glow as an inherent IPS trait that changes with viewing angle and distance, while light leakage remains fixed regardless of viewing position, making the viewing-angle test the definitive way to separate the two.⁴

Distinguishing IPS glow from panel bleed on the PG279QM

View the full-black pattern straight-on from your seating position first, then deliberately shift your viewing angle left and right. Glow that shifts in location or brightness as you move is angle-dependent IPS glow common to the Fast IPS panel. Bleed that stays fixed in position no matter where you sit is backlight bleed from the edge LED array and warrants a different assessment. On the PG279QM, moderate corner haze that only appears at displaced viewing angles is typical Fast IPS behaviour, while visible bleed from the lower edge during ordinary content from your normal desk position is the stronger case for a return or exchange.

Uniformity check and strobing-mode verification on the PG279QM

With pixel defects and response time both assessed, run the mid-grey uniformity test in a darkened room to evaluate backlight consistency. The mid-grey pattern reveals brightness gradients across the full surface more clearly than the black pattern, which can exaggerate corner haze. Minor variation visible only on close inspection is within normal tolerance; obvious hotspots or side-to-side brightness differences that affect normal gaming content are stronger reasons to evaluate a retailer return.

Checking strobing modes

Do not assume G-SYNC Pulsar is available on this older PG279QM. ASUS says G-SYNC Pulsar support should be confirmed from the product specifications, so check your OSD and ASUS support page for the exact PG279QM firmware and region before testing strobing modes.⁵ If your unit exposes a strobing option, test it at 240 Hz first, then at lower refresh rates only if flicker is acceptable. With uniformity, pixel health, and motion all assessed through this combined uniformity and motion audit, you have a complete quality baseline for this unit before committing, and the same patterns work identically on any Fast IPS panel, so keep them in mind for the next 240 Hz monitor you evaluate.