I have an dell inspiron 660s. It has an 220w psu and an nvidia gt 620. I am going to upgrade my psu to 430w. My problem is after upgrading will the nvidia gtx 660 even fit in my case?
No. I have a 660s too. No.No.No.No. Just remove the case and the PSU and swap the PSU and the 620 out and leave it on a surface or get a new case or reinstall. I am a owner of a GTX 780 with the dell mobo and 3330s CPU.
If not, get a low profile 630 or 640 and just slap it in there.