Even though I only have the 1 fan version of the ASUS 750 Ti's, here's a bit of a comparison of what I learned about the different brands so far:
| JPC hashrate | temps | | notes |
| Gigabyte | ~5.5 MH/s | ~56C | | 2 fans, 6-pin power connector |
| ASUS | ~5.2 MH/s | ~66C | | 1 fan version |
| MSI | ~5.3 MH/s | ~59C | | 1 fan, has no fan RPM sensor (reports 4294967295RPM in ccminer - max integer) though it does have fan control |
I had the same confirmed issue with the fan speed on the MSI 750ti OC card, but the TF model with twin fans shows correctly reporting fan RPM, and also has the lower temps reported by your other twin fan models.
Overall, I am a big fan of the TF model from MSI, but I think all the twin fan models show much better cooling with larger heat sinks as well.
I think it is very much worth the extra $20 for better performance and lower temps...