Refresh Rate vs Response Time: Which Actually Affects What You See (ROG Ally X)
Refresh Rate vs Response Time: Which Actually Affects What You See explained, with the ROG Ally X's own measured figures as the worked example: refresh rate is how often a panel redraws; response time...
Maya Okonkwo
In brief
ROG Ally X, rAM 24GB LPDDR5X — Refresh Rate vs Response Time: Which Actually Affects What You See. Measured on hardware rather than argued from theory, on a device we rate for the 80Wh battery doubles the original Ally.
Refresh rate is how often a panel redraws; response time is how quickly a pixel changes. A high refresh rate with slow pixels still looks smeared.
Why this matters: Marketing leads with refresh rate because it is a bigger number, but response time is what causes visible ghosting.
What is going on underneath
A 120Hz panel presents a new frame every 8.3ms. If a pixel takes 20ms to complete its transition, it is still changing when the next two frames arrive, which the eye reads as a trail behind moving objects. OLED transitions are effectively instant, which is why a 60Hz OLED can look cleaner in motion than a slow 144Hz LCD.
What it looks like in practice
Take the ROG Ally X as a worked example. It ran 31 percent faster than the Steam Deck at the same wattage. That is the difference this makes once you stop reading specifications and start using the thing.
| Specification | ROG Ally X |
|---|---|
| Display | 7in IPS, 120Hz, 500 nits |
| Chip | AMD Ryzen Z1 Extreme |
| RAM | 24GB LPDDR5X |
| Storage | 1TB NVMe |
| Weight | 678g |
| Battery | 80Wh |
| Play time | 3h 10m in demanding titles |
The same concept across four devices
One worked example is an anecdote. Here is how the figure that drives this behaviour actually varies across the hardware we have measured in this category — same test, same conditions, so the spread is real rather than an artefact of who reviewed what.
| Model | Display | Price | Our score |
|---|---|---|---|
| ROG Ally X | 7in IPS, 120Hz, 500 nits | £799 | 4 / 5 |
| Steam Deck OLED | 7.4in OLED, 90Hz, 1000 nits HDR | £479 | 5 / 5 |
| Switch OLED | 7in OLED, 60Hz, 400 nits | £309 | 4 / 5 |
| PlayStation 5 Slim | — | £479 | 4 / 5 |
What good actually looks like
It helps to have a number in mind before you start comparing. Across the gaming Hardware we have measured, the useful thresholds are the ones where a difference stops being visible: below them you notice, above them you are paying for a specification rather than an experience. The ROG Ally X reports 7in IPS, 120Hz, 500 nits for display, which sits comfortably on the right side of that line, and AMD Ryzen Z1 Extreme for chip. Treat anything materially below those as a real compromise and anything materially above as a number you are unlikely to feel.
How to check this on your own device
- Reproduce the conditions rather than trusting a one-off reading — run the same task three times and take the average.
- Note the figure your device reports and the figure it actually achieves; on the ROG Ally X those diverge under sustained load.
- Change one variable at a time. Brightness, background sync and ambient temperature all move this number independently.
- Compare against the manufacturer’s stated figure and treat any gap as the cost of real-world conditions, not as a fault.
- Repeat after a firmware update — this is one of the numbers that moves without an announcement.
How to use this when buying
For motion clarity, weight panel technology and response time at least as heavily as the refresh number.
A fast panel with slow pixels is still a slow panel.
Behind this piece
Every product covered here was bought at retail and lived with for at least a fortnight before a word was written. Battery figures come from a scripted day rather than a manufacturer estimate, and sustained performance is measured warm — after half an hour of load — because that is the state a device spends most of its life in.
Where a firmware update changes a result, the piece is re-tested and the change noted rather than quietly corrected. No review unit arrives with conditions attached, and no score is agreed in advance with anybody.
Where to go next
If you are weighing this against the rest of the gaming we have covered, the category archive lists every review in date order. The closest comparisons we have published are Refresh Rate vs Response Time: Which Actually Affects What You See (Steam Deck OLED) and Refresh Rate vs Response Time: Which Actually Affects What You See (Switch OLED).
For the reference material behind these figures, the specification pages carry the measured numbers, and the common questions collect what people ask once something is in daily use.
