I have a AXLE GTX 560 Ti 1GB graphics card & i use a Samsung S23A550H (Full HDMI/VGA connecters (NO DVI) )
Currently im connected via VGA cable & i want to know if i change to HDMI 1.4a cable will i get a Significant OR Noticable change in the Graphics Quality? especially when i play PC games in 1920x1080 resolution with Full graphic details?
VGA/DE-15F is an analog signal which tends to degrade in quality as resolution goes up. Some people may say otherwise but I noticed a large difference in image sharpness and clarity when using a digital signal (HDMI/Dual Link DVI-A/DisplayPort).
If you can use an HDMI or DVI-A/I cable then you certainly should.
VGA was fine for 1600x1200 gaming years ago. (1.92M pixels.) 1920x1080 is 2.07M pixels which isn't very many more.
I would still use HDMI however as a digital signal will allow for HDCP viewing. Picture quality shouldn't be much different if at all. (meaning it might just be in your head) But not having issues when watching protected media will make it worth it.