Blur Busters Forums

So, I recently purchased a Samsung LS27FG602SIXCI 500Hz OLED monitor. It has DP 1.4 ports with a throughput of 25 Gbps and HDMI 2.1 ports with a throughput of 48 Gbps. I connected my PC via HDMI to reduce the DSC compression.
Now I've created a custom resolution of 1920x1440 @ 500Hz. Everything works fine.
But I'd like to overclock the monitor above this refresh rate.
Unfortunately, when I set it to 510Hz, the monitor reports a suboptimal refresh rate and there's no image.
Is there a way to bypass this limitation and overclock the display?

F1zus wrote: ↑

26 Jan 2026, 04:00

But I'd like to overclock the monitor above this refresh rate.
Unfortunately, when I set it to 510Hz, the monitor reports a suboptimal refresh rate and there's no image.
Is there a way to bypass this limitation and overclock the display?

Generally, you can only play around with 'limits' (mishaps in FW writing) emposed by the TCON.
I would suggest trying a lower resolution (e.g.: 720p @ 1000Hz through the HDMI 2.1) to see if there's a refresh rate lock or a pixel clock lock in the firmware.
• Try using CRU (extension block→detailed resolution with DisplayID2.0; Rely on different timing presets first) or NvCpl.
• Try using binary search as much as possible.
• Once you exhaust the default presets mentioned above, resort to manual tuning in CRU (has the ability to change back porch, which Nvidia's Control Panel doesn't allow you to)
• Horizontal/vertical Back/front porches are your main targets to play around with, take a look at the BenQ 144hz thread to see some tips which Chief has given and which solutions users have come up with to find a higher clock for their models.

Display 'overclocking ' (custom EDIDs) is a very uncommon talked about topic online, let alone OLED 'overclocking'.
Samsung used to have a decent 'overclocker' with the Odyssey G7 (27" QHD +240Hz VA), so they might allow such endeavours on some other models in their lineup.

kyube wrote: ↑

27 Jan 2026, 10:10

F1zus wrote: ↑

26 Jan 2026, 04:00

But I'd like to overclock the monitor above this refresh rate.
Unfortunately, when I set it to 510Hz, the monitor reports a suboptimal refresh rate and there's no image.
Is there a way to bypass this limitation and overclock the display?

So, I tested various resolutions and frequencies. It turns out, regardless of the resolution, whether 2560x1440 or 1290x720, the monitor refuses to work at anything above 504Hz. At 505Hz, I get a dark screen and the message "Out of range, set optimal 2560x1440@500Hz."
It looks like there's a frequency limit somewhere in the monitor's firmware.
I opened the firmware update .bin file with a HEX editor and didn't find any mention of 504Hz.
Yes, I tried reducing the timings in CRU, but that didn't help.
These were the default settings in CRU. I just added a Display 2.0 block with my custom resolution.
Initially, I didn't even see the 2560x1440@500Hz resolution in these blocks, and I don't understand where the monitor gets it from.

Hey, can someone help me overclock my OLED beyond 500Hz? I'd like to try it.

F1zus wrote: ↑

26 Jan 2026, 04:00

So, I recently purchased a Samsung LS27FG602SIXCI 500Hz OLED monitor. It has DP 1.4 ports with a throughput of 25 Gbps and HDMI 2.1 ports with a throughput of 48 Gbps. I connected my PC via HDMI to reduce the DSC compression.
Now I've created a custom resolution of 1920x1440 @ 500Hz. Everything works fine.
But I'd like to overclock the monitor above this refresh rate.
Unfortunately, when I set it to 510Hz, the monitor reports a suboptimal refresh rate and there's no image.
Is there a way to bypass this limitation and overclock the display?

Hi! Tell me, please, what exactly did you do to force the monitor to apply custom settings? I have the same monitor, but it does not respond to changes in the CRU.