All these rams are high quality makes and guaranteed working fine.
You can even bring your pc for installation, and/or will be shown working prior to payment.
Genuine Kingston DDR3-1333 ram 2 x 4GB set
CAS 9, 1.5v, with lifetime warranty, passed full memtest run
$50 firm, will be shown working
Kingston HyperX Fury (red heatsinks) DDR3-1600 ram 2 x 4GB set
with XMP, with lifetime warranty, passed full memtest run
If your motherboard / processor can support DDR3-1866 this set can run at that speed as well.
$60 firm, will be shown working
I also have Corsair Vengeance (black heatsinks) DDR3-1600 ram 2 x 4GB set
low latency 9-9-9 ram, 1.5v, with XMP, with lifetime warranty, passed full memtest run
$60 firm, will be shown working. I have two sets of these available (4 x 4GB).