Above was a clarification to Leaps-from-Shadows post; it's RAM nomenclature.
Your CPU Intel i5 760 is fine for 1600 MHz RAM
assuming your MOBO BIOS has 'DRAM Frequency -> DDR3 1600' otherwise stick to DDR3 1333. Also, in my experience the LGA 1156 works best with DDR3 1600 @ 1.65v so make certain your BIOS has 'DRAM Voltage -> 1.65v {±0.01v}.
Assuming
DDR3 1333 @ 1.50v 4x4GB Kits:
Newegg -> $130 F3-10666CL9Q-16GBRL
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231312
Crucial -> {$148 CT2KIT51264BA1339}
http://www.crucial.com/store/listparts.aspx?model=DH55HC&Cat=RAM
Specs ->
http://www.intel.com/support/motherboards/desktop/dh55hc/sb/CS-030973.htm
Overview ->
http://www.intel.com/products/desktop/motherboards/DH55HC/DH55HC-overview.htm
Newegg ->
http://www.newegg.com/Product/Product.aspx?Item=N82E16813121396
{Bizarre way of saying use DDR3 1333 @ 1.50v up to 4x4GB}
• Four 240-pin DDR3 SDRAM Dual Inline Memory Module (DIMM) sockets
• Support for DDR3 1333 MHz and DDR3 1066 MHz DIMMs
• Support for 1 Gb and 2 Gb memory technology
• Support for up to 16 GB of system memory with four DIMMs using 2 Gb
memory technology
• Support for non-ECC memory
It's your MOBO not your CPU; other H55's can allow for DDR3 1600 and faster...
edit: BTW 4GB density are often a PITA to run on pre-LGA 1155 so IMO if they give you any troubles then Flash your BIOS to the latest version.