The 1.7.0 branch introduced official 64-bit support, which offered a performance boost and better modern hardware compatibility.
: You can find archived versions of these specific builds on the official PCSX2 Legacy Build Archive on GitHub . pcsx2 150 dev build 2021
generally found them to be significantly more advanced and capable than the older "stable" 1.4.0 release. By 2021, these dev builds had evolved into the 1.7.x nightly cycle pcsx2 150 dev build 2021
