As lots of people using pcsx2 would already know, setting resolution to native looks jaggy and the PS2 looks noticeably smooth on a HDTV but here is my settings to achieve those smooth CRT PS2 graphics that everyone with a bad GPU would like to follow. there are two ways of achieving the result but would work better if using the CRT Method.
HDTV/Monitor way
Step 1: Set the monitor resolution to 640x480 or 720x480/720x576 progressive, for laptops use resolution changer SX2 or your integrated GPU settings.Using a HDTV or monitor, a VGA cable or HDMI cable would be preferred. Note: Only switch resolutions when necessary.
Step 2: Set window of PCSX2 to 4:3 to fix stretching of the graphics for 640x480, if you use 720x480p or 720x576p you need to adjust the horizontal scaling and vertical scaling to 50x50 on Intel integrated GPU but AMD will vary, Note: If you are using 4:3 there will be side black bars on a 16:9 HDTV,if game supports 16:9 internally it won't matter, and if games have a widescreen patch then you can use that instead but if you do use widescreen patches than set to 16:9.
Step 3: Set the graphics in GSDX set internal resolution to native and use a CRT to reduce the sharp edges and will give that authentic look.
If your games support progressive scan use it otherwise use blend bff dr interlacing method or leave to default. It is optional to use interlaced mode rather than progressive but compatibility may not be supported.
CTR TV/OTHER WAY
Step 1: Using a Desktop or laptop, plug into CRT TV with an AV cable or S Video cable if Computer supports the plug.
Step 2: If necessary change resolution to 720x480 or 720x576 and ensure it is working properly, again use Resolution Changer SX2 to help.
Step 3: Change GSDX in PCSX2 to Native resolution.
Step 4: Change window to 4:3 in PCSX2 so the game displays properly.
But use 16:9 for games supporting widescreen.
HDTV/Monitor way
Step 1: Set the monitor resolution to 640x480 or 720x480/720x576 progressive, for laptops use resolution changer SX2 or your integrated GPU settings.Using a HDTV or monitor, a VGA cable or HDMI cable would be preferred. Note: Only switch resolutions when necessary.
Step 2: Set window of PCSX2 to 4:3 to fix stretching of the graphics for 640x480, if you use 720x480p or 720x576p you need to adjust the horizontal scaling and vertical scaling to 50x50 on Intel integrated GPU but AMD will vary, Note: If you are using 4:3 there will be side black bars on a 16:9 HDTV,if game supports 16:9 internally it won't matter, and if games have a widescreen patch then you can use that instead but if you do use widescreen patches than set to 16:9.
Step 3: Set the graphics in GSDX set internal resolution to native and use a CRT to reduce the sharp edges and will give that authentic look.
If your games support progressive scan use it otherwise use blend bff dr interlacing method or leave to default. It is optional to use interlaced mode rather than progressive but compatibility may not be supported.
CTR TV/OTHER WAY
Step 1: Using a Desktop or laptop, plug into CRT TV with an AV cable or S Video cable if Computer supports the plug.
Step 2: If necessary change resolution to 720x480 or 720x576 and ensure it is working properly, again use Resolution Changer SX2 to help.
Step 3: Change GSDX in PCSX2 to Native resolution.
Step 4: Change window to 4:3 in PCSX2 so the game displays properly.
But use 16:9 for games supporting widescreen.