64 bit has been widespread since Vista and has been the standard since Win 7.
As far as hardware, anything since dual-core exists has 64 bit capability. Longer if we're talking AMD.
As usual people are going to cry just to cry because a quick look at
steam's hardware survey shows that not even 2.5% of users are on 32 bit.
If you really think any company is going to keep them selves from changing something because of a theoretical 2.5% of the gaming population... lol
I actually play on a Intel HD 530 at #4 Settings on a 2560x1080 monitor just fine even on raids. The 630 probably has the same performance on #5.