LG W2220P 1680x1050 75Hz - is it really 75Hz?

Talk about overclocking displays at a higher refresh rate. This includes homebrew, 165Hz, QNIX, Catleap, Overlord Tempest, SEIKI displays, certain HDTVs, and other overclockable displays.
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Phoenix
Posts: 4
Joined: 24 Jan 2021, 20:14

LG W2220P 1680x1050 75Hz - is it really 75Hz?

Post by Phoenix » 24 Jan 2021, 21:06

I'm using an ancient monitor, LG W2220P. I always OCd it to 1440x900 75Hz, and was kinda happy with it in games. I remember I couldn't make it higher than 77Hz at lower resolution, and sth like 65Hz at 1680x1050. I also always used old drivers, especially 441.41. However, I did a clean install of Win 8.1 today, and decided to give 461.09 a try. After I installed it, I wanted to do 75Hz OC as always. I tested in Nvidia CP first just to make sure it works on the newest drivers. And strange things started to happen:

Firstly, 1440x900 75Hz automatic didn't change active pixels to lower ones. Monitor was reporting on its OSD 1680x1050 75Hz.
Then I tried the settings I used before in CRU. I kept getting black screen no matter what I tried.
Then I tried create 1680x1050 75Hz in Nvidia CP - passed test.
I think CRU 1.4.1 (or .2) doesn't support the newest Nvidia drivers anymore. So I downloaded the newest CRU, and it finally worked. Both 1440x900 (automatic PC) and 1680x1050 75Hz.

Am I going crazy or the newest drivers somehow unlocked a higher refresh rate support for my ancient display?
How can I test if it's really 75Hz or monitor's OSD just trolling me? It's hard to tell because of DWM in Windows, slower mouse sens (as I'm used to 1440x900), but moving white window on the black background slowly and fast is better 1680x1050 75Hz vs 60Hz. I don't have any game to test now, and it's really late, so probably I'll be able to do it tomorrow. UFO test is showing 75FPS 75Hz with green READY.
I've attached CRU settings.

I had it fixed one time when it didn't want to turn on, but I'm preeetty sure they didn't change the panel, as the repair cost was really cheap, and they weren't sure if they'd be able to repair it when I called them.

BTW, how is it with horizontal front/back porch, sync width, etc? I saw people claiming that lowering them to nearly or even to zero gives them better smoothness/latency. An example of someone's low porch sync etc. is in the screenshot in the attachments.
If so, how to calculate it? I've read it's dangerous to do it without calculations.
Attachments
Someone's low timings
Someone's low timings
someonestimings.png (10.23 KiB) Viewed 2446 times
1680x1050 75Hz CRU
1680x1050 75Hz CRU
1680-75hz-cru.png (12.86 KiB) Viewed 2446 times

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