What batch s7 is that? running at 731 with low err rates and avg 4.8+? What PSU you using? I have not had much luck OC'ing the newer batches. I am only OC'ing batch 1-6 with pretty good results.
Batch 8 using an EVGA 1600.
Can S7s make do with EVGA 1300?
Supposedly they can if you don't OC.
batches 1 to 7 on stock freq
batches 8 to 15 on a down clock to freq 625
I agree with this. Batch 8-15 are the least efficient variants of the S7 and require more power than any of the previous batches. I use EVGA 1300G2 on batches 2 and 4 (1160W stock). Batch 8 and above require another ~140W at stock which is beyond what most 1300G2's can reliably sustain due to the inherent power variance. Sure, you might get lucky but that is the exception. Use 2x 850W or a single 1600W supply with these.