because my older board h61 could not
H61 was used for prebuilts like Dell and HP. With proper bios update, H61 would run at 1600 at least with Dell OptiPlex.
See:
https://www.intel.com/content/www/u...000007110/boards-and-kits/desktop-boards.html
Unsure about 1866 with B75 but see Bios notes for ver. 1606:
https://www.asus.com/in/Motherboards/P8B75M/HelpDesk_BIOS/
See:
http://dlcdnet.asus.com/pub/ASUS/mb/LGA1155/P8B75-M/P8B75-M-1866-2400DIMM-QVL.pdf
P8B75-M 2 2
DDR3 1866 Qualified Vendors List (QVL)
2 DIMM 4 DIMM
A-DATA AX3U1866PB2G8-DP2(XMP) 2GB DS - - 8-8-8-24 1.55V-1.75V
CORSAIR CMT4GX3M2A1866C9(XMP) 4GB(2 x 2GB) DS - - 9-9-9-24 1.65V 〈〈
CORSAIR CMT6GX3MA1866C9(XMP) 6GB(3 x 2GB) DS - - 9-9-9-24 1.65V 〈〈
CORSAIR CMZ8GX3M2A1866C9(XMP) 8GB(2 x 4GB) DS - - 9-10-9-27 1.50V 〈〈
G.SKILL F3-14900CL9Q-16GBZL(XMP1.3) 16GB ( 4GB x4
) DS - - 9-10-9-28 1.5V 〈〈
G.SKILL F3-14900CL10Q2-64GBZLD(XMP1.3) 64GB ( 8GBx 8
) DS - - 10-11-10-30 1.5V 〈〈
G.SKILL F3-14900CL9D-8GBXL(XMP) 8GB(2 x 4GB) DS - - 9-10-9-28 1.5V 〈〈
G.SKILL F3-14900CL9Q-8GBXL(XMP) 8GB(2GBx4) DS - - 9-9-9-24 1.6V 〈〈
KINGSTON KHX1866C9D3T1K3/3GX(XMP) 3GB(3 x 1GB) SS - - - 1.65V 〈〈
KINGSTON KHX1866C9D3K4/16GX(XMP) 16GB ( 4GB x4
) DS - - - 1.65V 〈〈
KINGSTON KHX1866C9D3T1K3/6GX(XMP) 6GB(3 x 2GB) DS - - - 1.65V 〈〈
KINGSTON KHX1866C11D3P1K2/8G 8GB ( 4GB x 2) DS - - - 1.5V 〈〈
Vendor PartNum. Size SS/DS Chip Brand ChipNum Timing -
Dimm Vol.
4 DIMM Slots
•
1 DIMM: Supports one module inserted in any slot as Single-channel memory configuration
•
4 DIMM: Supports 4 modules inserted into both the blue and black slots as two pairs of Dual-channel memory configuration
-It is recommended to install the memory modules from the slots for better overclocking capability.
Timing Voltage ocket support (Op
•
2 DIMM: Supports one pair of modules inserted into eithor the blue slots or the black slots as one pair of Dual-channel
memory configuration
-When installing total memory of 4GB capacity or more, Windows 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of
less than 3GB is recommended.
-The default DIMM frequency depends on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under
the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value.