Just throwing this out there..
My TY-147A tops out at 1400 RPM, and my TY-147B tops out at 1300 RPM.
I have TY-147A in the lower front position on my Meshify C, I plan on putting the B in that spot, and putting the A back on TS140P.
The A is a bit loud at full speed, I can hear it over my Panaflos that are running @ 7v.
3770K @ 4700 1.375v|Le Grand Macho RT/TY-143|Asus P8Z77-V|8GB G.Skill Mix @ 1100 9-11-9-28 2T 1.68v|Intel 545S @ Raid 0|EVGA GTX 980 Classified @ 1500/2001|CM Silent Pro M2 850|FD Meshify C TG
X5690 E.S. @ Stock+Turbo|True Spirit 140 Power/TY147B|Asus Rampage III Formula|10GB G.Skill Mix @ 666 8-8-8-24 1T 1.575v|Intel 520|EVGA GTX 970 FTW ACX 2.0 @ 1404/1753|TT TP650|FD Define R4