With CrystalDiskMark in Windows 7 x64 this card gets 43.61MB/s Read speed, 33.08MB/s write speed.
I got the same results with two different USB 3.0 chipsets
1) onboard Intel USB 3.0 controller with latest driver 188.8.131.52
2) Renasas uPD720201 USB 3.0 controller latest driver 184.108.40.206, latest firmware 220.127.116.11
Using Kingston mobilelite g3 usb 3.0 card reader (which is capable of 95MB/s read and write speed). This card is basically 10% slower than rated speeds. I was hoping that it would have beat the rated speeds like my other PNY cards.
Since this is an SDXC card, it comes preformatted with exFAT file system, which is not as compatible with older SD devices. But make sure card reader or camera is marked as SDHC or SDXC capable and it should be compatible with this card.
This is a great value for the price, most 64GB cards in this price range are not this fast, and are not as reputable as Polaroid (OEM PNY). Only thing is this card comes with 3 year warranty, while PNY branded cards come with lifetime warranty. But if it lasts one year in my hands, it should last a lifetime.
I bought 10 of these cards, and they all perform perfectly with no issues.