UFO Test SYNC FAILURE

[boykale]

Hello. I have got a Viewsonic XG2530.
Whenever I try to do UFO Test, I always get sync failure. The frame rate goes around 235-239. However if I open a game in the background, the test syncs to 240.
If I set my monitor to 144hz, it syncs even if I don't open a game in the background. There is just some potential browser stutter.
I tried different browsers like opera etc. but none of them worked.

https://imgur.com/a/qHnF816

PC SPEC
GeForce RTX 2080 Duke 8G OC
Intel Core i7-9700K
MSI MPG Z390 Gaming Plus
Gskill 16 GB (2x8GB) SniperX DDR4 3200MHz CL16 1.35V
Samsung 500GB 970 EVO M.2 Sata NVMe SSD
Cooler Master MasterWatt Lite 700W

[Chief Blur Buster]

Hmmm. That's interesting.

It's a web browser issue in this particular case.

Often the CPU/GPU automatically goes into power management mode, saving electricity power but making TestUFO too inaccurate to synchronize to 240Hz. The timer granularity during low-power mode may be accurate enough for 144Hz but not always for 240Hz. TestUFO uses less than 1% of a CPU nowadays, which actually some times interferes with its ability to stay smooth (ironically).

Fixing this may be a simple matter of setting CPU to 100%, unless it's a GPU power management behaviour.

I might have to make an optional option to make TestUFO more complex to increase more CPU/GPU to make it sync properly. (ironic!)

[ToothlessRaider]

Hi I know this is an old thread. But I have the same issue as OP. And its not a browser issue limited to one browser. Chrome, Edge and Firefox all return the same

SYNC FAILURE:
Unable to VSYNC. Try closing all apps and browser tabs.

I7 9700K
GTX 1080 ti
Acer 240hz 1ms monitor
LG 144hz 1ms monitor.

Issue remains with GSync on and off. I am guessing no solution is coming since I am necroing an old thread?

[Chief Blur Buster]

This is usually because something is wrong with your computer system or operating system issue -- it only affects less than 5% of users that is unfixable.

1. Try the suggestions in this thread:
viewtopic.php?f=19&t=3549

2. If fail, try screenshotting www.testufo.com/animation-time-graph.
Sometimes I've helped someone fix it (e.g. disabling crappy RGB controller software which can add lag).