Summary: Memory failed with row hammer errors in Memtest right out of the box and at default settings. Even when underclocked down to 1333MHz both modules failed. This problem appears to be rather widespread and not limited to just Corsair, Wikipedia has a good writeup for those interested.
Pros: May work at desired 1600Mz if installed as stand alone memory.
Cons: If combined with existing Apple memory modules, all modules now show running at a slower 1333Mz vs the origional 1600Mz. All chips state on the physical chip they are 1600Mz, PC3 (12800). Researched on Mac Rumors and there is discussion this is due to the mismatch in CL latency (these SDRAMs show...
Pros: Worked as expected........ for about a week.
Cons: After a week, started getting memory errors and then progressively more frequent "blue screen" shutdowns. Subsequent testing revealed one of the two memory sticks was defective. Have RMA'd. Awaiting replacement. Disappointed by the lack of reliability and hassle of replacement.
Cons: I enabled XMP mode in my bios to get the sticks to run at 1600mhz. The motherboard detected the timings correctly. However, every few hours windows would crash. I disabled XMP to stop the crashes. It's seems the ram I received is not stable at the advertised speed.
Summary: Installed the new Corsair ram and got multiple blue screens and auto reboots almost immediately. Tried one module at a time...one works, the other was no post. I expected a better product from this well known company.
Pros: Low Profile, Black Heatspreaders. Aesthetically Pleasing to the Eye.
Cons: One of the memory modules was garbage right out of the packaging.